Publications

@article{diazsanchez010,

title = {Kriper: A blockchain network with permissioned storage},

author = {MaríaIsabel Rojo-Rivas and Daniel Díaz-Sánchez and Florina Almenarez and Andrés Marín-Lopez},

doi = {https://doi.org/10.1016/j.future.2022.08.006},

issn = {0167-739X},

year  = {2022},

date = {2022-08-17},

urldate = {2022-01-01},

journal = {Future Generation Computer Systems},

volume = {138},

pages = {160-171},

abstract = {Blockchain has been a revolution in the past few years. Beyond the new currencies that were created around different incarnations of the blockchain concept, there are many other contributions that provide interesting services as a data linked structure using a decentralized network that provide a high level of security. Companies have developed many projects to incorporate blockchain into their business logic pursuing to incorporate other related services as persistence of large volumes of data, privacy or anonymity of transactions, distributed data processing, security (confidentiality, integrity, and availability), document management or micro messages in real time. Nevertheless, as it will be discussed in this article, current blockchains do not meet the needs of companies in many aspects, leading to a scarce or superficial adoption. This article introduces Kriper, a blockchain that aims at meeting corporate world needs by responding with a community-based, open blockchain that may also be segregated and private for certain uses whereas it provides a permissioned distributed storage and micro message lightweight services.},

keywords = {Access control, Blockchain, Confidentiality, cynamon, Distributed storage, Permissioned storage, privacy, ricon},

pubstate = {published},

tppubtype = {article}

}

@article{marin002,

title = {Security Information Sharing in Smart Grids: Persisting Security Audits to the Blockchain},

author = {Andrés Marín-López and Sergio Chica-Manjarrez and David Arroyo and Florina Almenares-Mendoza and Daniel Díaz-Sánchez },

url = {https://www.mdpi.com/2079-9292/9/11/1865

},

doi = {https://doi.org/10.3390/electronics9111865},

issn = {2079-9292},

year  = {2020},

date = {2020-11-06},

urldate = {2020-11-06},

journal = {Electronics},

volume = {9},

pages = {1865},

abstract = {With the transformation in smart grids, power grid companies are becoming increasingly

dependent on data networks. Data networks are used to transport information and commands for

optimizing power grid operations: Planning, generation, transportation, and distribution. Performing

periodic security audits is one of the required tasks for securing networks, and we proposed in a

previous work AUTOAUDITOR, a system to achieve automatic auditing. It was designed according

to the specific requirements of power grid companies, such as scaling with the huge number of

heterogeneous equipment in power grid companies. Though pentesting and security audits are

required for continuous monitoring, collaboration is of utmost importance to fight cyber threats.

In this paper we work on the accountability of audit results and explore how the list of audit result

records can be included in a blockchain, since blockchains are by design resistant to data modification.

Moreover, blockchains endowed with smart contracts functionality boost the automation of both

digital evidence gathering, audit, and controlled information exchange. To our knowledge, no such

system exists. We perform throughput evaluation to assess the feasibility of the system and show

that the system is viable for adaptation to the inventory systems of electrical companies.},

keywords = {cynamon, inteligenciafuentesabiertas, permissioned blockchain, scalability, security auditing, smart grid security},

pubstate = {published},

tppubtype = {article}

}

@article{diazsanchez009,

title = {Specification and Unattended Deployment of Home Networks at the Edge of the Network},

author = {Iván Bernabé-Sánchez and Daniel Díaz-Sánchez and Mario Muñoz-Organero},

url = {https://ieeexplore.ieee.org/document/9173527},

doi = {10.1109/TCE.2020.3018543},

issn = {0098-3063},

year  = {2020},

date = {2020-08-21},

urldate = {2020-08-21},

journal = {IEEE TRANSACTIONS ON CONSUMER ELECTRONICS},

volume = {66},

issue = {4},

pages = {279 - 288},

abstract = {Consumer devices continue to expand their capabilities by connecting to digital services and other devices to form information-sharing ecosystems. This is complex and requires meeting connection requirements and minimal processing capabilities to ensure communication. The emergence of new services, and the evolution of current technologies, constantly redefine the rules of the game by opening up new possibilities and increasing competition among service providers. Paradigms such as edge computing, softwarization of physical devices, self-configuration mechanisms, definition of software as a code and interoperability between devices, define design principles to be taken into account in future service infrastructures. This work analyzes these principles and presents a programmable architecture in which services and virtual devices are instantiated in any computing infrastructure, as cloud or edge computing, upon request according to the needs specified by service providers or users. Considering that the target computing infrastructures are heterogeneous, the solution defines network elements and provides network templates to ensure it can be deployed on different infrastructures irrespectively of the vendor. A prototype has been developed and tested on a virtualized cloud-based home network relying on open source solutions.},

keywords = {Cloud computing, connected consumer devices, edge computing, fog computing, joint digital transformation, orchestrator},

pubstate = {published},

tppubtype = {article}

}

@article{almenarez006,

title = {INRISCO: INcident monitoRing in Smart COmmunities},

author = {MÓNICA AGUILAR-IGARTUA AND FLORINA ALMENARES-MENDOZA AND REBECA DÍAZ-REDONDO AND MANUELA MARTÍN-VICENTE AND JORDI FORNÉ AND CELESTE CAMPO AND ANA FERNÁNDEZ-VILAS AND LUIS CRUZ-LLOPIS AND CARLOS GARCÍA-RUBIO AND ANDRÉS MARÍN-LÓPEZ AND AHMAD MOHAMAD-MEZHER AND DANIEL DÍAZ-SÁNCHEZ AND HÉCTOR CEREZO-COSTAS AND DAVID REBOLLO-MONEDERO AND PATRICIA ARIAS-CABARCOS AND FRANCISCO JOSÉ RICO-NOVELLA

},

url = {https://ieeexplore.ieee.org/document/9064504

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9064504},

doi = {https://doi.org/10.1109/ACCESS.2020.2987483},

issn = {2169-3536},

year  = {2020},

date = {2020-04-13},

urldate = {2020-04-13},

journal = {IEEE Access},

volume = {8},

pages = {72435 - 72460},

abstract = {Major advances in information and communication technologies (ICTs) make citizens to be considered as sensors in motion. Carrying their mobile devices, moving in their connected vehicles or actively participating in social networks, citizens provide a wealth of information that, after properly processing, can support numerous applications for the benefit of the community. In the context of smart communities, the INRISCO [1] proposal intends for (i) the early detection of abnormal situations in cities (i.e., incidents), (ii) the analysis of whether, according to their impact, those incidents are really adverse for the community; and (iii) the automatic actuation by dissemination of appropriate information to citizens and authorities. Thus, INRISCO will identify and report on incidents in traffic (jam, accident) or public infrastructure (e.g., works, street cut), the occurrence of specific events that affect other citizens' life (e.g., demonstrations, concerts), or environmental problems (e.g., pollution, bad weather). It is of particular interest to this proposal the identification of incidents with a social and economic impact, which affects the quality of life of citizens.},

keywords = {big data analysis, citizen sensor, early detection of incidents, inrisco, Smart Cities, social networks, vehicular communications},

pubstate = {published},

tppubtype = {article}

}

@article{Diaz_Sanchez_2019,

title = {DNS/DANE Collision-Based Distributed and Dynamic Authentication for Microservices in IoT †},

author = {Daniel Díaz-Sánchez and Andrés Marín-Lopez and Florina Almenárez Mendoza and Patricia Arias Cabarcos},

url = {http://dx.doi.org/10.3390/s19153292

/download/DNS_DANE_Collision-Based_Distributed_and_Dynamic_Authentication_for_Microservices_in_IoT.pdf},

doi = {10.3390/s19153292},

issn = {1424-8220},

year  = {2019},

date = {2019-07-26},

urldate = {2019-07-26},

journal = {Sensors},

volume = {19},

issue = {15},

pages = {3292},

publisher = {MDPI AG},

abstract = {IoT devices provide real-time data to a rich ecosystem of services and applications. The volume of data and the involved subscribe/notify signaling will likely become a challenge also for access and core networks. To alleviate the core of the network, other technologies like fog computing can be used. On the security side, designers of IoT low-cost devices and applications often reuse old versions of development frameworks and software components that contain vulnerabilities. Many server applications today are designed using microservice architectures where components are easier to update. Thus, IoT can benefit from deploying microservices in the fog as it offers the required flexibility for the main players of ubiquitous computing: nomadic users. In such deployments, IoT devices need the dynamic instantiation of microservices. IoT microservices require certificates so they can be accessed securely. Thus, every microservice instance may require a newly-created domain name and a certificate. The DNS-based Authentication of Named Entities (DANE) extension to Domain Name System Security Extensions (DNSSEC) allows linking a certificate to a given domain name. Thus, the combination of DNSSEC and DANE provides microservices’ clients with secure information regarding the domain name, IP address, and server certificate of a given microservice. However, IoT microservices may be short-lived since devices can move from one local fog to another, forcing DNSSEC servers to sign zones whenever new changes occur. Considering DNSSEC and DANE were designed to cope with static services, coping with IoT dynamic microservice instantiation can throttle the scalability in the fog. To overcome this limitation, this article proposes a solution that modifies the DNSSEC/DANE signature mechanism using chameleon signatures and defining a new soft delegation scheme. Chameleon signatures are signatures computed over a chameleon hash, which have a property: a secret trapdoor function can be used to compute collisions to the hash. Since the hash is maintained, the signature does not have to be computed again. In the soft delegation schema, DNS servers obtain a trapdoor that allows performing changes in a constrained zone without affecting normal DNS operation. In this way, a server can receive this soft delegation and modify the DNS zone to cope with frequent changes such as microservice dynamic instantiation. Changes in the soft delegated zone are much faster and do not require the intervention of the DNS primary servers of the zone.},

keywords = {authentication, chameleon signatures, cynamon, DANE, DNSSEC, Internet of Things, magos, microservices},

pubstate = {published},

tppubtype = {article}

}

@article{diazsanchez011,

title = {Task Scheduling to Constrain Peak Current Consumption in Wearable Healthcare Sensors},

author = {Robert Simon-Sherratt and Balazs Janko and Terence Hui and William S.-Harwin and Nilanjan Dey and Daniel Díaz-Sánchez and Jin Wang and Fuqian Shi},

url = {https://doi.org/10.3390/electronics8070789

https://www.mdpi.com/2079-9292/8/7/789

https://www.mdpi.com/2079-9292/8/7/789/pdf?version=1563172692},

doi = {https://doi.org/10.3390/electronics8070789},

issn = {2079-9292},

year  = {2019},

date = {2019-07-15},

urldate = {2019-07-15},

journal = {Electronics},

volume = {8},

pages = {789},

abstract = {Small embedded systems, in our case wearable healthcare devices, have significant engineering challenges to reduce their power consumption for longer battery life, while at the same time supporting ever-increasing processing requirements for more intelligent applications. Research has primarily focused on achieving lower power operation through hardware designs and intelligent methods of scheduling software tasks, all with the objective of minimizing the overall consumed electrical power. However, such an approach inevitably creates points in time where software tasks and peripherals coincide to draw large peaks of electrical current, creating short-term electrical stress for the battery and power regulators, and adding to electromagnetic interference emissions. This position paper proposes that the power profile of an embedded device using a real-time operating system (RTOS) will significantly benefit if the task scheduler is modified to be informed of the electrical current profile required for each task. This enables the task scheduler to schedule tasks that require large amounts of current to be spread over time, thus constraining the peak current that the system will draw. We propose a solution to inform the task scheduler of a tasks’ power profile, and we discuss our application scenario, which clearly benefited from the proposal.},

keywords = {embedded, health care, joint digital transformation, low-power, task scheduler, wearable},

pubstate = {published},

tppubtype = {article}

}

@article{8704893,

title = {TLS/PKI Challenges and Certificate Pinning Techniques for IoT and M2M Secure Communications},

author = {Daniel Díaz-Sánchez and Andrés Marín-López and Florina Almenárez-Mendoza and Patricia Arias-Cabarcos and R. Simon-Sherratt},

url = {https://doi.org/10.1109/COMST.2019.2914453

https://ieeexplore.ieee.org/document/8704893

https://phpmyadmin.pervasive.it.uc3m.es/download/TLC-PKI-challenges-certificate-pinning.pdf},

doi = {10.1109/COMST.2019.2914453},

issn = {1553-877X},

year  = {2019},

date = {2019-05-02},

urldate = {2019-05-02},

journal = {IEEE Communications Surveys and Tutorials},

volume = {21},

issue = {4},

pages = {3502-3531},

abstract = {Transport layer security (TLS) is becoming the de facto standard to provide end-to-end security in the current Internet. IoT and M2M scenarios are not an exception since TLS is also being adopted there. The ability of TLS for negotiating any security parameter, its flexibility and extensibility are responsible for its wide adoption but also for several attacks. Moreover, as it relies on public key infrastructure (PKI) for authentication, it is also affected by PKI problems. Considering the advent of IoT/M2M scenarios and their particularities, it is necessary to have a closer look at TLS history to evaluate the potential challenges of using TLS and PKI in these scenarios. According to this, this paper provides a deep revision of several security aspects of TLS and PKI, with a particular focus on current certificate pinning solutions in order to illustrate the potential problems that should be addressed.},

keywords = {authentication, certificate pinning, cynamon, DTLS, Internet of Things, Machine to Machine, magos, PKI, Protocols, TLS, Trusted Third Party, Tutorials},

pubstate = {published},

tppubtype = {article}

}

@article{8246828,

title = {Seamless human-device interaction in the internet of things},

author = {E Rubio-Drosdov and D Díaz-Sánchez and F Almenárez and P Arias-Cabarcos and A Marín},

url = {/download/Seamless_Human-Device_Interaction_in_the_Internet_of_Things.pdf

https://ieeexplore.ieee.org/document/8246828},

doi = {10.1109/TCE.2017.015076},

issn = {1558-4127},

year  = {2017},

date = {2017-11-01},

urldate = {2017-11-01},

journal = {IEEE Transactions on Consumer Electronics},

volume = {63},

issue = {4},

pages = {490-498},

abstract = {The Internet of Things will bring a scenario in which interaction between humans and devices will be critical to allow people to use, monitor or configure Internet of Things devices. Interactions in such applications are based on traditional graphical interfaces. Devices that accept interaction based on Natural Language, e.g., through voice commands, can understand basic human orders or answering questions whenever user expressions fit into a known language pattern. Some devices can understand natural language voice commands but require sophisticated voice assistants located in the cloud, which raises significant privacy concerns. Others devices which handle voice-processing locally can perform a very limited local recognition system, requiring users to be familiar with words the system can process. The purpose of this work is to diminish the complexity of Natural Language processing in the context of IoT. The solution posited in this article allows Internet of Things devices to offload Natural Language processing to a system that improves the use of Natural Language and alleviates the need to learn or remember specific words or terms intended for triggering device actions. We have evaluated the feasibility of the design with a proof-of-concept implemented in a home environment and it was tested by real users.},

keywords = {Human-Device Interaction, inrisco, Internet of Things, Natural Language Processing},

pubstate = {published},

tppubtype = {article}

}

@article{8003467,

title = {Collaborative eHealth Meets Security: Privacy-Enhancing Patient Profile Management},

author = {Rosa Sánchez-Guerrero and Florina Almenárez-Mendoza and Daniel Díaz-Sánchez and Patricia Arias-Cabarcos and Andrés Marín-López},

url = {/download/Collaborative_eHealth_meets_Security_Privacy-Enhancing_Patient_Profile_Management.pdf

https://ieeexplore.ieee.org/document/8003467},

doi = {10.1109/JBHI.2017.2655419},

issn = {2168-2194 },

year  = {2017},

date = {2017-11-01},

urldate = {2017-11-01},

journal = {IEEE Journal of Biomedical and Health Informatics},

volume = {21},

issue = {6},

pages = {1741-1749},

abstract = {Collaborative healthcare environments offer potential benefits, including enhancing the healthcare quality delivered to patients and reducing costs. As a direct consequence, sharing of electronic health records (EHRs) among healthcare providers has experienced a noteworthy growth in the last years, since it enables physicians to remotely monitor patients' health and enables individuals to manage their own health data more easily. However, these scenarios face significant challenges regarding security and privacy of the extremely sensitive information contained in EHRs. Thus, a flexible, efficient, and standards-based solution is indispensable to guarantee selective identity information disclosure and preserve patient's privacy. We propose a privacy-aware profile management approach that empowers the patient role, enabling him to bring together various healthcare providers as well as user-generated claims into an unique credential. User profiles are represented through an adaptive Merkle Tree, for which we formalize the underlying mathematical model. Furthermore, performance of the proposed solution is empirically validated through simulation experiments.},

keywords = {EHR, emadrid2, Merkle Tree, Minimal Disclosure, privacy, Profile Management},

pubstate = {published},

tppubtype = {article}

}

@article{7838091,

title = {Secure store and forward proxy for dynamic IoT applications over M2M networks},

author = {Daniel Díaz-Sánchez, R. Simon-Sherratt, Florina Almenarez, Patricia Arias, and Andrés Marín},

url = {https://ieeexplore.ieee.org/document/7838091

https://phpmyadmin.pervasive.it.uc3m.es/download/Secure__Store_and_Forward_Proxy_for_Dynamic_IoT_Applications_over_M2M_Networks.pdf},

doi = {10.1109/TCE.2016.7838091},

issn = {0098-3063},

year  = {2016},

date = {2016-11-01},

urldate = {2016-11-01},

journal = {IEEE Transactions on Consumer Electronics},

volume = {62},

issue = {4},

pages = {389-397},

abstract = {Internet of Things (IoT) applications are expected to generate a huge unforeseen amount of traffic flowing from Consumer Electronics devices to the network. In order to overcome existing interoperability problems, several standardization bodies have joined to bring a new generation of Machine to Machine (M2M) networks as a result of the evolution of wireless sensor/actor networks and mobile cellular networks to converged networks. M2M is expected to enable IoT paradigms and related concepts into a reality at a reasonable cost. As part of the convergence, several technologies preventing new IoT services to interfere with existing Internet services are flourishing. Responsive, message-driven, resilient and elastic architectures are becoming essential parts of the system. These architectures will control the entire data flow for an IoT system requiring sometimes to store, shape and forward data among nodes of a M2M network to improve network performance. However, IoT generated data have an important personal component since it is generated in personal devices or are the result of the observation of the physical world, so rises significant security concerns. This article proposes a novel opportunistic flexible secure store and forward proxy for M2M networks and its mapping to asynchronous protocols that guarantees data confidentiality.},

keywords = {encryption, Internet of Things, Machine to Machine, privacy},

pubstate = {published},

tppubtype = {article}

}

@article{HUI2017358,

title = {Major requirements for building Smart Homes in Smart Cities based on Internet of Things technologies},

author = {Terence K-L-Hui and Simon R-Sherratt and Daniel Díaz-Sánchez},

url = {http://www.sciencedirect.com/science/article/pii/S0167739X16304721

/download/Major_requirements_for_building_Smart_Homes_in_Smart_Cities_based.pdf},

doi = {https://doi.org/10.1016/j.future.2016.10.026},

issn = {0167-739X},

year  = {2016},

date = {2016-11-01},

urldate = {2016-11-01},

journal = {Future Generation Computer Systems},

volume = {76},

pages = {358 - 369},

abstract = {The recent boom in the Internet of Things (IoT) will turn Smart Cities and Smart Homes (SH) from hype to reality. SH is the major building block for Smart Cities and have long been a dream for decades, hobbyists in the late 1970s made Home Automation (HA) possible when personal computers started invading home spaces. While SH can share most of the IoT technologies, there are unique characteristics that make SH special. From the result of a recent research survey on SH and IoT technologies, this paper defines the major requirements for building SH. Seven unique requirement recommendations are defined and classified according to the specific quality of the SH building blocks.},

keywords = {Ambient intelligence, Home Automation, Internet of Things, Smart Cities, Smart Home requirements},

pubstate = {published},

tppubtype = {article}

}

@article{7579116,

title = {Comparing Password Management Software: Toward Usable and Secure Enterprise Authentication},

author = {Patricia Arias-Cabarcos, Andrés Marín, Diego Palacios, Florina Almenárez and Daniel Díaz-Sánchez},

url = {https://ieeexplore.ieee.org/document/7579116

https://doi.org/10.1109/MITP.2016.81

/download/ComparingPasswordManagementSoftware.pdf},

doi = {10.1109/MITP.2016.81},

issn = {1941-045X},

year  = {2016},

date = {2016-09-01},

urldate = {2016-09-01},

journal = {IT Professional},

volume = {18},

issue = {5},

pages = {34-40},

abstract = {In today's corporate IT systems, employees routinely repeat an undeniable pattern: accessing a huge number of password-protected services. In this regard, although deploying a strong enterprise password policy can increase security against online breaches and data leaks, it also imposes a significant usability burden on users. To alleviate this problem, password managers (PMs) are considered user-friendly tools that automate password generation and login processes. But how secure and usable are these tools? The authors analyze the four most popular PMs with free versions from both security and usability perspectives. The comparison leads to recommendations on enterprise PM selection, as well as to the identification of new lines of research and development on usable authentication.},

keywords = {cybersecurity, emadrid2, password managers, Security, usability},

pubstate = {published},

tppubtype = {article}

}

@article{khaled001,

title = {Analysis of Secure TCP/IP Profile in 61850 Based Substation Automation System for Smart Grids},

author = {Omar Khaled and Andrés Marín and Florina Almenares and Patricia Arias and Daniel Díaz},

url = {https://journals.sagepub.com/doi/10.1155/2016/5793183},

doi = {https://doi.org/10.1155/2016/5793183},

issn = {1550-1477},

year  = {2016},

date = {2016-04-18},

urldate = {2016-04-18},

journal = {International Journal of Distributed Sensor Networks},

volume = {12},

issue = {4},

abstract = {Smart grid is the term used to describe modern power grids. It aims at achieving efficient, sustainable, economic, and secure delivery of electricity supplies. In order to achieve these goals, communication between different components within the grid and control centers is required. In a rapidly growing world, the demands for substation automation are increasing. Recently, two trends have been changing Substation Automation Systems: IEC 61850 and the need for cybersecurity. IEC 61850 specifies very strict performance requirements for message transfer time. The security for the smart grid must be designed to satisfy both performance and reliability requirements. In this paper, we address a study about secure communication in the substation real-time environment, complying with the IEC 61850 specifications. We mainly focus on analyzing the proposed Secure TCP/IP profile for MMS, testing different cipher suite combinations and examining whether by applying TLS we can still achieve the strict performance requirements of IEC 61850 or not. As a result of the study, we propose a list of cipher suite combinations that should be used. The importance of this study lies mainly on future scenarios, because IEC 61850 is thought to support smart metering communications.},

keywords = {inrisco, smart grids},

pubstate = {published},

tppubtype = {article}

}

@article{almenarez005,

title = {PECEVA: An adaptable and energy-saving credential validation solution for pervasive networks},

author = {Florina Almenarez and M. Francisca Hinarejos and Andrés Marín and Josep Lluís Ferrer-Gomila and Daniel Díaz Sánchez},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0020025516301578?via%3Dihub},

doi = {https://doi.org/10.1016/j.ins.2016.03.010},

issn = {0020-0255},

year  = {2016},

date = {2016-03-12},

urldate = {2016-03-12},

journal = {INFORMATION SCIENCES},

volume = {354},

pages = {41-59},

abstract = {Wireless, mobile, and context-awareness applications are considered to be the epitome of pervasive computing, but they bring with them the inherent security challenges of mobile ad-hoc networking. Mobile ad-hoc networks are mainly formed by mobile users, which can belong to different trust domains, in order to leverage the wealth of pervasive resources and available capabilities. The use of digital certificates is suitable for pervasive networking because of its decentralized and dynamic nature. Nevertheless, the validation of such certificates can become a more complex and costly process than it is in fixed-infrastructure networks. This is because pervasive networks face challenges such as environments that change with a certain degree of randomness, ad-hoc interactions with foreign devices, temporal disconnections that make it difficult to access updated and required information, and limited devices running costly processes. For these reasons, we propose a user-centric architecture that extends the validation of digital certificates in an adaptive way. The main contribution consists of a decision engine that takes advantage of the specific local and external resources in an opportunistic fashion. The solution preserves the security level required for each application and the resource consumption of the user device.



},

keywords = {Certificate validation efficiency, Decision engine, inrisco, Pervasive networks, PKIX, Trust management},

pubstate = {published},

tppubtype = {article}

}

@article{ariascabarcos002,

title = {Blended Identity: Pervasive IdM for Continuous Authentication},

author = {Patricia Arias-Cabarcos and Florina Almenárez and Rubén Trapero and Daniel Díaz-Sánchez and Andrés Marín},

url = {https://ieeexplore.ieee.org/document/7118079},

doi = {https://doi.org/10.1109/MSP.2015.62},

issn = {1540-7993},

year  = {2015},

date = {2015-06-04},

urldate = {2015-06-04},

journal = {IEEE Xplore},

volume = {13},

issue = {3},

pages = {32-39},

abstract = {A proper identity management approach is necessary for pervasive computing to be invisible to users. Federated identity management is key to achieving efficient identity blending and natural integration in the physical and online layers where users, devices, and services are present.},

keywords = {blended identity, emrisco, identity management, IdM, Pervasive computing, Protocols, risk assessment, Security},

pubstate = {published},

tppubtype = {article}

}

@article{diazsanchez002,

title = {A distributed transcoding and content protection system: Enabling pay per quality using the cloud},

author = {Daniel Díaz-Sánchez and Rosa Sánchez-Guerrero and Patricia Arias and Florina Almenarez and Andrés Marín },

url = {https://link.springer.com/article/10.1007/s11235-014-9952-x},

doi = {https://doi.org/10.1007/s11235-014-9952-x},

issn = {1572-9451},

year  = {2015},

date = {2015-01-01},

urldate = {2015-01-01},

journal = {Telecommunication Systems},

volume = {61},

issue = {1},

pages = {59 - 76},

abstract = {Video coding is a process for adapting media content to the constraints of transmission networks delivery and terminal device visualization. Moreover, content protection is also necessary. Nowadays the heterogeneity of client devices is increasing leading to different resolutions, qualities and form factors. Due to this, transcoding and protection are essential processes to be conducted in modern video distribution networks to adapt video to devices and network constraints and to enable pay per quality schemas enforcing content licenses. Unfortunately, transcoding and protection can be no longer considered linear since every single content should be transcoded in several formats and sometimes protected, so it would require a long time to finish. Modern scalable coding techniques, as H264 SVC, can help to save processing power and bandwidth providing in a single stream several video versions. However, if the enhancements of a SVC encoded content are protected separately, it would possible to enable pay-per-quality providing an additional degree of freedom to content delivery industry. Unfortunatelly, transcoding and protection entail huge doses of processing power at provider side and should be distributed. Moreover, processing key streams to decrypt enhancements that were encrypted separately can increase the complexity at receiver side. Cloud computing emerges as a potential solution for coping with large population of users with heterogeneous visualization devices. The elastic nature of cloud computing can be an advantage given the difficulty to predict the computing resources video content would require to be distributed during the entire content life. This article describes a system that distributes and parallelizes the video transcoding process as well as the content encryption, following the SaaS approach in cloud computing. Moreover, the article describes an experimental approach for generating and processing a flexible key stream that would help to simplify key management at receiver side and would allow legacy receivers to consume SVC content with separate enhancement protection.},

keywords = {Cloud computing, content protection keyword, raudo2, transcoding},

pubstate = {published},

tppubtype = {article}

}

@article{diazsanchez001,

title = {Media Gateway: bringing privacy to Private Multimedia Clouds connections},

author = {Daniel Díaz-Sánchez and Florina Almenarez and Andrés Marín and Rosa Sánchez-Guerrero and Patricia Arias },

url = {https://link.springer.com/article/10.1007/s11235-013-9783-1},

doi = {https://doi.org/10.1007/s11235-013-9783-1},

issn = {1572-9451},

year  = {2014},

date = {2014-02-01},

journal = {Telecommunication Systems},

volume = {55},

issue = {2},

pages = {315-330},

abstract = {The growing interest in media sharing combined with the explosion of social applications have opened an opportunity window for cloud based applications for media management as Media Cloud, described in this article, that has brought the concept of Cloud Computing to home environments. Media Cloud provides a comprehensive and efficient solution for managing content among federated home environments. As part of the purpose of empowering the user role as well as to improve user experience, we placed significant efforts on interoperability and privacy protection when it comes to accessing cloud resources from other networks. This article describes a solution that enables limited devices to access contents located in private clouds, as Media Cloud, with the cooperation of network providers.},

keywords = {Cloud computing, multimedia, privacy, streaming},

pubstate = {published},

tppubtype = {article}

}

@article{almenarez004,

title = {Overhead of using Secure Wireless Communications in Mobile Computing},

author = {Florina Almenares and Patricia Arias and Andrés Marín and Daniel Díaz-Sánchez and Rosa Sánchez

},

url = {https://ieeexplore.ieee.org/document/6531115

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6531115},

doi = {https://doi.org/10.1109/TCE.2013.6531115},

issn = {0098-3063},

year  = {2013},

date = {2013-05-06},

urldate = {2013-05-06},

journal = {IEEE TRANSACTIONS ON CONSUMER ELECTRONICS},

volume = {59},

issue = {2},

pages = {335-342},

abstract = {Secure wireless communications are fundamental in any interaction in order to avoid security and privacy breaches, especially from mobile devices. The use of this kind of communications is far more frequent and the number of users increases day after day. This paper shows and analyzes the support, performance and consumption of cryptographic algorithms and cipher suites in terms of time and energy when secure communications (i.e., using SSL) are established according to different security levels. This study has been performed in distinct operating systems, and using different browsers and libraries.},

keywords = {Browsers, Ciphers, Energy and time performance, Energy consumption, Handheld devices, Secure wireless communications, servicioseguridad, SSL/TLS, Wireless communication},

pubstate = {published},

tppubtype = {article}

}

@article{ariascabarcos004,

title = {SuSSo: Seamless and Ubiquitous Single Sign-on for Cloud Service Continuity across devices},

author = {Patricia Arias-Cabarcos and Florina Almenárez-Mendoza and Rosa Sánchez-Guerrero and Andrés Marín-López and Daniel Díaz-Sánchez},

url = {https://ieeexplore.ieee.org/document/6415016

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6415016},

doi = {https://doi.org/10.1109/TCE.2012.6415016},

issn = {0098-3063},

year  = {2012},

date = {2012-11-01},

urldate = {2012-11-01},

journal = {IEEE TRANSACTIONS ON CONSUMER ELECTRONICS},

volume = {58},

issue = {4},

pages = {1425-1433},

abstract = {The great variety of consumer electronic devices with support of wireless communications combined with the emerging Cloud Computing paradigm is paving the way to real anytime/anywhere computing. In this context, many services, such as music or video streaming, are delivered to the clients using Cloud-based providers. However, service continuity when moving across different terminals is still a major challenge. This paper proposes SuSSo, a novel middleware architecture that allows sessions initiated from one device to be seamlessly transferred to a second one, as might be desirable in the enjoyment of long running media.},

keywords = {Cloud computing, Computer architecture, context, middleware, Performance evaluation, personal multimedia devices, raudo2, Security, service continuity, sessionhandoff, xml},

pubstate = {published},

tppubtype = {article}

}

@article{ariascabarcos001,

title = {A Metric-Based Approach to Assess Risk for "On Cloud" Federated Identity Management},

author = {Patricia Arias-Cabarcos and Florina Almenárez-Mendoza and Andrés Marín-López and Daniel Díaz-Sánchez and Rosa Sánchez-Guerrero },

url = {https://link.springer.com/article/10.1007/s10922-012-9244-2},

doi = {https://doi.org/10.1007/s10922-012-9244-2},

issn = {1573-7705},

year  = {2012},

date = {2012-07-04},

urldate = {2012-07-04},

journal = {Journal of Network and Systems Management},

volume = {20},

issue = {4},

pages = {513-533},

abstract = {The cloud computing paradigm is set to become the next explosive revolution on the Internet, but its adoption is still hindered by security problems. One of the fundamental issues is the need for better access control and identity management systems. In this context, Federated Identity Management (FIM) is identified by researchers and experts as an important security enabler, since it will play a vital role in allowing the global scalability that is required for the successful implantation of cloud technologies. However, current FIM frameworks are limited by the complexity of the underlying trust models that need to be put in place before inter-domain cooperation. Thus, the establishment of dynamic federations between the different cloud actors is still a major research challenge that remains unsolved. Here we show that risk evaluation must be considered as a key enabler in evidence-based trust management to foster collaboration between cloud providers that belong to unknown administrative domains in a secure manner. In this paper, we analyze the Federated Identity Management process and propose a taxonomy that helps in the classification of the involved risks in order to mitigate vulnerabilities and threats when decisions about collaboration are made. Moreover, a set of new metrics is defined to allow a novel form of risk quantification in these environments. Other contributions of the paper include the definition of a generic hierarchical risk aggregation system, and a descriptive use-case where the risk computation framework is applied to enhance cloud-based service provisioning.

},

keywords = {Cloud computing, federation, risk assessment, SAML, servicioseguridad, Trust management},

pubstate = {published},

tppubtype = {article}

}

@article{sanchezguerrero001,

title = {An Event Driven Hybrid Identity Management Approach to Privacy Enhanced e-Health},

author = {Rosa Sánchez-Guerrero and Florina Almenárez and Daniel Díaz-Sánchez and Andrés Marín and Patricia Arias and Fabio Sanvido

},

url = {https://www.mdpi.com/1424-8220/12/5/6129

https://www.mdpi.com/1424-8220/12/5/6129/pdf?version=1403317529},

doi = {https://doi.org/10.3390/s120506129},

issn = {1424-8220},

year  = {2012},

date = {2012-05-10},

urldate = {2012-05-10},

journal = {Sensors },

volume = {12},

issue = {5},

pages = {6129-6154},

abstract = {Credential-based authorization offers interesting advantages for ubiquitous scenarios involving limited devices such as sensors and personal mobile equipment: the verification can be done locally; it offers a more reduced computational cost than its competitors for issuing, storing, and verification; and it naturally supports rights delegation. The main drawback is the revocation of rights. Revocation requires handling potentially large revocation lists, or using protocols to check the revocation status, bringing extra communication costs not acceptable for sensors and other limited devices. Moreover, the effective revocation consent—considered as a privacy rule in sensitive scenarios—has not been fully addressed. This paper proposes an event-based mechanism empowering a new concept, the sleepyhead credentials, which allows to substitute time constraints and explicit revocation by activating and deactivating authorization rights according to events. Our approach is to integrate this concept in IdM systems in a hybrid model supporting delegation, which can be an interesting alternative for scenarios where revocation of consent and user privacy are critical. The delegation includes a SAML compliant protocol, which we have validated through a proof-of-concept implementation. This article also explains the mathematical model describing the event-based model and offers estimations of the overhead introduced by the system. The paper focus on health care scenarios, where we show the flexibility of the proposed event-based user consent revocation mechanism.},

keywords = {delegation, event, federation, health care, identity management, privacy, revocation consent, servicioseguridad, theory queue, user-centric},

pubstate = {published},

tppubtype = {article}

}