@inproceedings {2033, title = {CCBHash (Compound Code Block Hash) para An{\'a}lisis de Malware}, booktitle = {XVII Reuni{\'o}n Espa{\~n}ola sobre Criptolog{\'\i}a y Seguridad de la Informaci{\'o}n}, year = {2022}, month = {11/2022}, pages = {168-173}, author = {Pablo P{\'e}rez Jim{\'e}nez and Jose A. Onieva and Gerardo Fernandez} } @inproceedings {Alcaraz2022c, title = {Collaborative anomaly detection system for charging stations}, booktitle = {The 27th European Symposium on Research in Computer Security (ESORICS 2022)}, volume = {13555}, year = {2022}, month = {09/2022}, pages = {716{\textendash}736}, publisher = {Springer, Cham}, organization = {Springer, Cham}, abstract = {

In recent years, the deployment of charging infrastructures has been increasing exponentially due to the high energy demand of electric vehicles, forming complex charging networks. These networks pave the way for the emergence of new unknown threats in both the energy and transportation sectors. Economic damages and energy theft are the most frequent risks in these environments. Thus, this paper aims to present a solution capable of accurately detecting unforeseen events and possible fraud threats that arise during charging sessions at charging stations through the current capabilities of the Machine Learning (ML) algorithms. However, these algorithms have the drawback of not fitting well in large networks and generating a high number of false positives and negatives, mainly due to the mismatch with the distribution of data over time. For that reason, a Collaborative Anomaly Detection System for Charging Stations (here referred to as CADS4CS) is proposed as an optimization measure. CADS4CS has a central analysis unit that coordinates a group of independent anomaly detection systems to provide greater accuracy using a voting algorithm. In addition, CADS4CS has the feature of continuously retraining ML models in a collaborative manner to ensure that they are adjusted to the distribution of the data. To validate the approach, different use cases and practical studies are addressed to demonstrate the effectiveness and efficiency of the solution.

}, keywords = {Charging station, Collaborative anomaly detection, Machine Learning, Voting system}, doi = {https://doi.org/10.1007/978-3-031-17146-8_35}, author = {Jesus Cumplido and Cristina Alcaraz and Javier Lopez} } @inproceedings {1990, title = {Configuration vulnerability in SNORT for Windows operating systems}, booktitle = {2022 IEEE International Conference on Cyber Security and Resilience (IEEE CSR)}, year = {2022}, month = {08/2022}, pages = {82-89}, publisher = {IEEE}, organization = {IEEE}, address = {https://www.ieee-csr.org}, abstract = {

Cyber-attacks against Industrial Control Systems (ICS) can lead to catastrophic events which can be prevented by the use of security measures such as the Intrusion Prevention Systems (IPS). In this work we experimentally demonstrate how to exploit the configuration vulnerabilities of SNORT one of the most adopted IPSs to significantly degrade the effectiveness of the IPS and consequently allowing successful cyber-attacks. We illustrate how to design a batch script able to retrieve and modify the configuration files of SNORT in order to disable its ability to detect and block Denial of Service (DoS) and ARP poisoning-based Man-In-The-Middle (MITM) attacks against a Programmable Logic Controller (PLC) in an ICS network. Experimental tests performed on a water distribution testbed show that, despite the presence of IPS, the DoS and ARP spoofed packets reach the destination causing respectively the disconnection of the PLC from the ICS network and the modification of packets payload.

}, isbn = {978-1-6654-9952-1}, doi = {https://doi.org/10.1109/CSR54599.2022.9850309}, url = {https://ieeexplore.ieee.org/document/9850309}, author = {Luca Faramondi and Marta Grassi and Simone Guarino and Roberto Setola and Cristina Alcaraz} } @inproceedings {1978, title = {Comunicaciones VoIP cifradas usando Intel SGX}, booktitle = {V Jornadas Nacionales de Investigaci{\'o}n en Ciberseguridad (JNIC)}, year = {2019}, month = {06/2019}, abstract = {

Cada d{\'\i}a es m{\'a}s frecuente encontrar servicios en internet gestionados desde plataformas online y con la expansi{\'o}n de la tecnolog{\'\i}a IoT, los smartphones, las smartTV\ y otros tantos dispositivos: la autenticaci{\'o}n, la distribuci{\'o}n y al fin y al cabo, la comunicaci{\'o}n entre extremos puede verse seriamente comprometida si dicha plataforma es atacada. La inclusi{\'o}n de nuevas medidas de seguridad en este tipo de ecosistemas requiere de un cambios sustancial de la arquitectura subyacente en muchos casos, por lo que su avance es lento.\ 
En este trabajo se trata de forma concreta el desarrollo de una alternativa OpenSource\ a uno de estos servicios, la telefon{\'\i}a IP (VoIP), que esta expandi{\'e}ndose cada d{\'\i}a m{\'a}s, empezando por redes locales y privadas y llegando a grandes centralitas de conmutaci{\'o}n de tele operadoras, consiguiendo as{\'\i} una transmisi{\'o}n de voz segura extremo a extremo transparente para los servidores VoIP, que no requiera modificar la infraestructura subyacente.

}, author = {Ra{\'u}l Oca{\~n}a and Isaac Agudo} } @inproceedings {CRAT2018, title = {Capture the RAT: Proximity-based Attacks in 5G using the Routine Activity Theory}, booktitle = {The 16th IEEE International Conference on Dependable, Autonomic and Secure Computing (DASC 2018)}, year = {2018}, month = {08/2018}, pages = {520-527}, publisher = {IEEE}, organization = {IEEE}, address = {Athens, Greece}, abstract = {

The fifth generation of cellular networks (5G) will enable different use cases where security will be more critical than ever before (e.g. autonomous vehicles and critical IoT devices). Unfortunately, the new networks are being built on the certainty that security problems can not be solved in the short term. Far from reinventing the wheel, one of our goals is to allow security software developers to implement and test their reactive solutions for the capillary network of 5G devices. Therefore, in this paper a solution for analysing proximity-based attacks in 5G environments is modelled and tested using OMNET++. The solution, named CRAT, is able to decouple the security analysis from the hardware of the device with the aim to extend the analysis of proximity-based attacks to different use-cases in 5G. We follow a high-level approach, in which the devices can take the role of victim, offender and guardian following the principles of the routine activity theory.\ 

}, isbn = {978-1-5386-7518-2}, doi = {10.1109/DASC/PiCom/DataCom/CyberSciTec.2018.00100}, url = {https://ieeexplore.ieee.org/document/8511943}, author = {Ana Nieto and Antonio Acien and Javier Lopez} } @inproceedings {1701, title = {A comprehensive methodology for deploying IoT honeypots}, booktitle = {15th International Conference on Trust, Privacy and Security in Digital Business (TrustBus 2018)}, volume = {LNCS 11033}, year = {2018}, month = {09/2018}, pages = {229{\textendash}243}, publisher = {Springer Nature Switzerland AG}, organization = {Springer Nature Switzerland AG}, address = {Regensburg (Germany)}, abstract = {

Recent news have raised concern regarding the security on the IoT field. Vulnerabilities in devices are arising and honeypots are an excellent way to cope with this problem. In this work, current solutions for honeypots in the IoT context, and other solutions adaptable to it are analyzed in order to set the basis for a methodology that allows deployment of IoT honeypot.

}, keywords = {Honeypot, IoT, methodology, security}, doi = {https://doi.org/10.1007/978-3-319-98385-1_16}, author = {Antonio Acien and Ana Nieto and Gerardo Fernandez and Javier Lopez} } @inproceedings {1650, title = {Configuraci{\'o}n de honeypots adaptativos para an{\'a}lisis de malware}, booktitle = {III Jornadas Nacionales de Investigaci{\'o}n en Ciberseguridad (JNIC 2017)}, year = {2017}, month = {06/2017}, pages = {91-98}, publisher = {Servicio de Publicaciones de la URJC}, organization = {Servicio de Publicaciones de la URJC}, address = {Madrid (Spain)}, abstract = {

Este trabajo propone una arquitectura de despliegue de honeypots adaptativos, configurados din{\'a}micamente a partir de los requisitos del malware que intenta infectar los servicios trampa. A diferencia de otros trabajos sobre honeypots adaptativos, los mecanismos de adaptabilidad aqu{\'\i} dise{\~n}ados tomar{\'a}n como base informaci{\'o}n de inteligencia sobre amenazas actuales, indicadores de compromiso (IOCs) conocidos, as{\'\i} como informaci{\'o}n de actividades sospechosas actualmente en estudio por los analistas. Este conocimiento ser{\'a} empleado para configurar honeypots de manera din{\'a}mica, permitiendo satisfacer los requisitos necesarios para que el malware pueda desplegar toda su operativa.\ 

}, keywords = {adaptive, dynamic, Honeypot, intelligence, IOC, malware}, isbn = {978-84-608-4659-8}, url = {https://eciencia.urjc.es/handle/10115/14540}, author = {Gerardo Fernandez and Ana Nieto} } @inproceedings {931, title = {Context-Awareness using Anomaly-based Detectors for Smart Grid Domains}, booktitle = {9th International Conference on Risks and Security of Internet and Systems }, volume = {8924}, year = {2015}, month = {04/2015}, pages = {17-34}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, address = {Trento}, abstract = {

Anomaly-based detection applied in strongly interdependent systems, like Smart Grids, has become one of the most challenging research areas in recent years. Early detection of anomalies so as to detect and prevent unexpected faults or stealthy threats is attracting a great deal of attention from the scientific community because it offers potential solutions for context-awareness. These solutions can also help explain the conditions leading up\ to a given situation and help determine the degree of its severity. However, not all the existing approaches within the literature are equally effective in covering the needs of a particular scenario. It is necessary to explore the control requirements of the domains that comprise a Smart Grid, identify, and even select, those approaches according to these requirements and the intrinsic conditions related to the application context, such as technological heterogeneity and complexity. Therefore, this paper analyses the functional features of existing anomaly-based approaches so as to adapt them, according to the aforementioned conditions. The result of this investigation is a guideline for the construction of preventive solutions that will help improve the context-awareness in the control of Smart Grid domains in the near future.

}, keywords = {Context-Awareness, Control systems, Prevention, Smart Grid}, isbn = {978-3-319-17126-5}, doi = {10.1007/978-3-319-17127-2_2}, url = {http://link.springer.com/chapter/10.1007\%2F978-3-319-17127-2_2$\#$}, author = {Cristina Alcaraz and Lorena Cazorla and Gerardo Fernandez} } @inproceedings {431, title = {A Context-based Parametric Relationship Model (CPRM) to Measure the Security and QoS tradeoff in Configurable Environments}, booktitle = {IEEE International Conference on Communications (ICC{\textquoteright}14)}, year = {2014}, month = {06/2014}, pages = {755-760}, publisher = {IEEE Communications Society}, organization = {IEEE Communications Society}, address = {Sydney (Australia)}, abstract = {

Heterogeneity of future networks requires the use of extensible models to understand the Security and QoS tradeoff. We believe that a good starting point is to analyze the Security and QoS tradeoff from a parametric point of view and, for this reason, in a previous paper, we defined the Parametric Rela- tionship Model (PRM) to define relationships between Security and QoS parameters. In this paper, we extend that approach in order to change the behaviour of the model so that different contexts in the same system are considered; that is, to provide a Context-based Parametric Relationship Model (CPRM). The final aim is to provide useful tools for system administrators in order to help them deal with Security and QoS tradeoff issues in the configuration of the environment.\ 

}, isbn = {978-1-4799-2003-7}, doi = {10.1109/ICC.2014.6883410}, author = {Ana Nieto and Javier Lopez} } @inproceedings {onieva2012, title = {Como proteger la privacidad de los usuarios en Internet. Verificaci{\'o}n an{\'o}nima de la mayor{\'\i}a de edad}, booktitle = {XII Reuni{\'o}n Espa{\~n}ola sobre Criptolog{\'\i}a y Seguridad de la Informaci{\'o}n - RECSI 2012}, year = {2012}, month = {Sep 2012}, pages = {297-302}, publisher = {Mondragon}, organization = {Mondragon}, address = {San Sebastian (Spain)}, isbn = {978-84-615-9933-2}, author = {Jose A. Onieva and Isaac Agudo and Javier Lopez and G. Drapper-Gil and M.F. Hinarejos} } @inproceedings {moyano2012trustbus, title = {A Conceptual Framework for Trust Models}, booktitle = {9th International Conference on Trust, Privacy \& Security in Digital Business (TrustBus 2012)}, series = {LNCS}, volume = {7449}, year = {2012}, month = {Sep 2012}, pages = {93-104}, publisher = {Springer Verlag}, organization = {Springer Verlag}, address = {Vienna}, abstract = {

During the last twenty years, a huge amount of trust and reputation models have been proposed, each of them with their own particularities and targeting different domains. While much effort has been made in defining ever-increasing complex models, little attention has been paid to abstract away the particularities of these models into a common set of easily understandable concepts. We propose a conceptual framework for computational trust models that will be used for analyzing their features and for comparing heterogeneous and relevant trust models.

}, isbn = {978-3-642-32286-0}, issn = {0302-9743}, doi = {10.1007/978-3-642-32287-7}, author = {Francisco Moyano and Carmen Fernandez-Gago and Javier Lopez}, editor = {Fischer-H{\"u}bner, Simone and Katsikas, Sokratis and Quirchmayr, Gerald} } @inproceedings {agudo2011cryptography, title = {Cryptography Goes to the Cloud}, booktitle = {1st International Workshop on Security and Trust for Applications in Virtualised Environments (STAVE 2011)}, series = {Communications in Computer and Information Science}, volume = {187}, year = {2011}, month = {June}, pages = {190-197}, publisher = {Springer}, organization = {Springer}, abstract = {

In this paper we identify some areas where cryptography can help a rapid adoption of cloud computing. Although secure storage has already captured the attention of many cloud providers, offering a higher level of protection for their customer{\textquoteright}s data, we think that more advanced techniques such as searchable encryption and secure outsourced computation will become popular in the near future, opening the doors of the Cloud to customers with higher security requirements.

}, isbn = {978-3-642-22364-8}, doi = {10.1007/978-3-642-22365-5_23}, author = {Isaac Agudo and David Nu{\~n}ez and Gabriele Giammatteo and Panagiotis Rizomiliotis and Costas Lambrinoudakis}, editor = {Changhoon Lee and Jean-Marc Seigneur and James J. Park and Roland R. Wagner} } @inproceedings {JoseA.Montenegro2010, title = {Computacion Segura Multiparte Aplicada a Subastas Electr{\'o}nicas}, booktitle = {IX Jornadas de Ingenier{\'\i}a Telemenatica (JITEL 2010)}, year = {2010}, month = {Octubre}, abstract = {

La confidencialidad ha pasado de ser un requisito de seguridad a ser considerado como requisito funcional y de obligado cumplimiento e inclusi\ón en todos los sistemas de comunicaciones. Un inconveniente que presenta las t\écnicas criptogr\áficas, utilizadas para obtener la confidencialidad de la informaci\ón, surge cuando varias entidades se ven forzadas a compartir informaci\ón secreta para realizar tareas puntuales de colaboraci\ón, ya que las primitivas tradicionales utilizadas para conseguir la confidencialidad resultan poco flexibles. La situaci\ón ideal permitir\ía hacer posible dicha colaboraci\ón sin que ninguna de las partes revele la informaci\ón aportada. En este escenario entra en juego la tecnolog\ía de Computaci\ón Segura Multiparte (CSM) que posibilita realizar operaciones con la informaci\ón compartida sin tener que hacerla p\ública. Este trabajo muestra una soluci\ón CSM aplicada a una subasta electr\ónica que permite la realizaci\ón de la subasta sin que las apuestas sean reveladas a ning\ún participante, incluyendo el subastador, por lo que no necesita el estableciendo de ninguna autoridad confiable. Aunque la literatura ofrece una amplia variedad de propuestas te\óricas de CSM desde su creaci\ón en la d\écada de los ochenta, no es com\ún su aplicacion pr\áctica en situaciones reales.

}, author = {Jose A. Montenegro and Javier Lopez and Rene Peralta} } @inproceedings {Rios2008, title = {Clasificaci{\'o}n de canales encubiertos. Un nuevo canal: Covert_DHCP}, booktitle = {X Reuni{\'o}n Espa{\~n}ola de Criptolog{\'\i}a y Seguridad de la Informaci{\'o}n (RECSI{\textquoteright}08)}, year = {2008}, month = {Sept.}, pages = {325-336}, address = {Salamanca (Spain)}, abstract = {

Los canales encubiertos son una forma de comunicaci\ón oculta que puede vulnerar la integridad de los sistemas. Desde sus inicios en sistemas de seguridad multinivel a principios de los a\ños 70 han evolucionado considerablemente, apareciendo soluciones para redes de computadores debido a la especificaci\ón de algunos protocolos. Por este motivo, se hace un estudio sobre las t\écnicas que se han utilizado para crear los canales, as\í como sobre las distintos obst\áculos que han tratado de mermar su actividad. Asimismo, se presenta una nueva clasificaci\ón que trata de albergar la mayor cantidad de canales encubiertos existentes en la actualidad. Por \último, se analiza un protocolo ampliamente extendido en la actualidad, DHCP, en busca de posibilidades de albergar informaci\ón encubierta. A partir de este an\álisis se implementan distintas versiones de un canal encubierto haciendo uso de este protocolo.

}, keywords = {Canales encubiertos, control de accesos y detecci{\'o}n de intrusos, seguridad en redes, seguridad en sistemas de informaci{\'o}n}, isbn = {978-84-691-5158-7}, author = {Ruben Rios and Jose A. Onieva}, editor = {Luis Hern{\'a}ndez Encinas and Angel Martin del Rey} } @inproceedings {JavierLopez2005a, title = {Classifying Public Key Certificates}, booktitle = {2nd European PKI Workshop: Research and Applications (EuroPKI{\textquoteright}05)}, series = {LNCS}, volume = {3545}, year = {2005}, month = {June}, pages = {135-143}, publisher = {Springer}, organization = {Springer}, address = {Canterbury, U.K.}, abstract = {

In spite of the fact that there are several companies that (try to) sell public key certificates, there is still no unified or standardized classification scheme that can be used to compare and put into perspective the various offerings. In this paper, we try to start filling this gap and propose a four-dimensional scheme that can be used to uniformly describe and classify public key certificates. The scheme distinguishes between (i) who owns a certificate, (ii) how the certificate owner is registered, (iii) on what medium the certificate (or the private key, respectively) is stored, and (iv) what type of functionality the certificate is intended to be used for. We think that using these or similar criteria to define and come up with unified or even standardized classes of public key certificate is useful and urgently needed in practice.

}, author = {Javier Lopez and Rolf Oppliger and Guenther Pernul} } @inproceedings {EijiOkamoto2003, title = {Certificate Retrieval and Validation in Online Systems}, booktitle = {Symposium on Cryptography and Information Security (SCIS{\textquoteright}03)}, year = {2003}, month = {January}, pages = {25-30}, address = {Hamamatsu, Japan}, abstract = {

In order to more effectively deal with certificate management issues in PKIs, there is growing interest in supplementing offline X.509 PKI models with online services. An analysis of the security requirements of online models will be presented. Proposed online and delegated processing models will be evaluated in relation to these requirements.

}, author = {Eiji Okamoto and Javier Lopez and Ed Dawson and Juan M. Gonzalez-Nieto and Selwyn Russell and Jason Smith} } @inproceedings {JavierLopez1999c, title = {Cert{\textquoteright}eM: Certification System Based on Electronic Mail Service Structure}, booktitle = {Secure Networking (CQRE{\textquoteright}99)}, series = {LNCS}, volume = {1740}, year = {1999}, month = {December}, pages = {109-118}, publisher = {Springer}, organization = {Springer}, abstract = {

Public-Key Infrastructures are considered the basis of the protocols and tools needed to guarantee the security demanded for new Internet applications like electronic commerce, government-citizen relationships and digital distribution. This paper introduces a new infrastructure design, Cert{\textquoteright}eM, a key management and certification system that is based on the structure of the electronic mail service and on the principle of near-certification. Cert{\textquoteright}eM provides secure means to identify users and distribute their public-key certificates, enhances the efficiency of revocation procedures, and avoids scalability and synchronization problems. The system, developed and tested at the University of Malaga, was recently selected by RedIRIS, the National Research and Academic Network in Spain, to provide the public key service for its secure electronic mail.

}, author = {Javier Lopez and Antonio Mana and Juan J. Ortega} } @inproceedings {AlfonsoLarrosa1999, title = {Competitive Neural Networks Applied to Image Compression Techniques}, booktitle = {International Conference on Imaging Science, Systems and Technology (CISST{\textquoteright}99)}, year = {1999}, month = {June}, pages = {547-550}, author = {Alfonso Larrosa and Francisco Lopez and Javier Lopez} } @inproceedings {JavierLopez1996a, title = {Comparaci{\'o}n de la Condici{\'o}n de Parikh con algunas Condiciones de los Lenguajes de Contexto Libre}, booktitle = {II Jornadas de Inform{\'a}tica y Autom{\'a}tica}, year = {1996}, month = {Julio}, pages = {305-314}, address = {Almu{\~n}ecar, Espa}, abstract = {

In this paper we first compare Parikh\’s condition to various pumping conditions - Bar-Hillel\’s pumping lemma, Ogden\’s condition and Bader-Moura\’s condition; secondly, to interchange condition; and finally, to Sokolowski\’s and Grant\’s conditions. In order to carry out these comparisons we present some properties of Parikh\’s languages. The main result is the orthogonality of the previously mentioned conditions and Parikh\’s condition.

}, author = {Javier Lopez and Gonzalo Ramos and Rafael Morales} }