Now showing items 1-20 of 38

  • Adaptive packet scheduling for the support of QoS over DVB-S2 satellite systems 

    Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (Springer Verlag, 2011)
    Conference report
    Restricted access - publisher's policy
    This paper presents an adaptive algorithm for managing the weights of a weighted round robin (WRR) scheduler. The weights calculation depends on the capacity variations present in a Digital Video Broadcasting-Second ...
  • A game theoretic trust model for on-line distributed evolution of cooperation in MANETs 

    Mejía Fajardo, Marcela; Peña Traslaviña, Néstor; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Alzate Monroy, Marco (2011-01-13)
    Article
    Restricted access - publisher's policy
    Cooperation among nodes is fundamental for the operation of mobile ad hoc networks(MANETs). In such networks, there could be selfish nodes that use resources from other nodes to send their packets but that do not offer ...
  • A model for revocation forecasting in public-key infrastructures 

    Hernández Gañan, Carlos; Mata Diaz, Jorge; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Alins Delgado, Juan José (2015-05-01)
    Article
    Open Access
    One of the hardest tasks of a certification infrastructure is to manage revocation. This process consists in collecting and making the revocation status of certificates available to users. Research on this topic has focused ...
  • A modeling of certificate revocation and its application to synthesis of revocation traces 

    Hernández Gañán, Carlos; Mata Diaz, Jorge; Muñoz Tapia, José Luis; Hernández Serrano, Juan; Esparza Martín, Óscar; Alins Delgado, Juan José (2012)
    Article
    Restricted access - publisher's policy
    One of the hardest tasks of a public key infrastructure (PKI) is to manage revocation. New communication paradigms push the revocation system to the limit and an accurate resource assessment is necessary before implementing ...
  • Analysis of TCP variants over a QoS DVB-S2 system 

    Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (ACM Press. Association for Computing Machinery, 2011)
    Conference report
    Restricted access - publisher's policy
    This paper presents a performance analysis of the TCP protocol considering the DiffServ architecture to provide Quality of Service guarantees working over a Digital Video Broadcasting - Second Generation (DVB-S2) satellite ...
  • An infrastructure for detecting and punishing malicious hosts using mobile agent watermarking 

    Esparza Martín, Óscar; Muñoz Tapia, José Luis; Tomás Buliart, Joan; Soriano Ibáñez, Miguel (2010-04-02)
    Article
    Open Access
    Mobile agents are software entities consisting of code, data, and state that can migrate autonomously from host to host executing their code. In such scenario there are some security issues that must be considered. In ...
  • A simple closed-form approximation for the packet loss rate of a TCP connection over wireless links 

    Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (2014-09-15)
    Article
    Restricted access - publisher's policy
    This letter presents a new and simple model for a TCP flow experiencing random packet losses due to both transmission errors and congestion events. From this model, we will derive a straightforward expression of a unified ...
  • Certificate revocation system implementation based on the Merkle Hash Tree 

    Muñoz Tapia, José Luis; Forné Muñoz, Jorge; Esparza Martín, Óscar; Soriano Ibáñez, Miguel (2004-01)
    Article
    Restricted access - publisher's policy
    Public-key cryptography is widely used to provide Internet security services. The public-key infrastructure (PKI) is the infrastructure that supports the public-key cryptography, and the revocation of certificates implies ...
  • CERVANTES - A certificate validation test-bed 

    Muñoz Tapia, José Luis; Forné Muñoz, Jorge; Esparza Martín, Óscar; Soriano Ibáñez, Miguel (Springer Berlin / Heidelberg, 2004)
    Conference report
    Restricted access - publisher's policy
    Certificate validation is one of the toughest scalability problems of the PKI. The goal of this paper is to introduce a Java platform for certificate revocation called CERVANTES. CERVANTES pretends to be an easy to extend ...
  • COACH: COllaborative certificate stAtus CHecking mechanism for VANETs 

    Hernández Gañán, Carlos; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Mata Diaz, Jorge; Hernández Serrano, Juan; Alins Delgado, Juan José (2011-11-01)
    Article
    Restricted access - publisher's policy
    Vehicular Ad Hoc Networks (VANETs) require mechanisms to authenticate messages, identify valid vehicles, and remove misbehaving vehicles. A public key infrastructure (PKI) can be used to provide these functionalities using ...
  • Contribución a la protección de agentes móviles frente a hosts maliciosos. Detección de ataques y políticas de castigo 

    Esparza Martín, Óscar (Universitat Politècnica de Catalunya, 2004-07-07)
    Doctoral thesis
    Open Access
    Este trabajo presenta tanto el estado del arte como el análisis de las principales propuestas de protección de agentes móviles frente a los ataques de la plataforma de ejecución. La comprensión del problema de los hosts ...
  • Cross-layer packet scheduler for QoS support over digital video broadcasting-second generation broadband satellite systems 

    Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (2014-10-01)
    Article
    Restricted access - publisher's policy
    This article presents a cross-layer packet scheduler to provide end-to-end QoS guarantees for Digital Video Broadcasting-Second Generation (DVB-S2) broadband satellite systems. The scheduler design is based on a cross-layer ...
  • EPA: An efficient and privacy-aware revocation mechanism for vehicular ad hoc networks 

    Hernández Gañan, Carlos; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Mata Diaz, Jorge; Alins Delgado, Juan José (Elsevier, 2015-08-01)
    Article
    Open Access
    Security is vital for the reliable operation of vehicular ad hoc networks (VANETs). One of the critical security issues is the revocation of misbehaving vehicles. While essential, revocation checking can leak private ...
  • Evaluation of cryptographic capabilities for the Android platform 

    Gonzalez Peon, David; Esparza Martín, Óscar; Muñoz Tapia, José Luis; Alins Delgado, Juan José; Mata Diaz, Jorge (Springer, 2015)
    Conference report
    Restricted access - publisher's policy
    Future networks will be formed by millions of devices, many of them mobile, sharing information and running applications. Android is currently the most widely used operating system in smartphones, and it is becoming more ...
  • Impact of the revocation service in PKI prices 

    Hernández Gañán, Carlos; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Mata Diaz, Jorge; Alins Delgado, Juan José (2012)
    Conference report
    Restricted access - publisher's policy
    The ability to communicate securely is needed for many network applications. Public key infrastructure (PKI) is the most extended solution to verify and confirm the identity of each party involved in any secure transaction ...
  • Implementacion de Ipsec en una arquitectura TCP splitting 

    Caubet Fernández, Juan; Muñoz Tapia, José Luis; Alins Delgado, Juan José; Mata Diaz, Jorge; Esparza Martín, Óscar (2010)
    Conference report
    Open Access
    El rendimiento de las aplicaciones que utilizan el protocolo de transporte TCP (Transmission Control Protocol) sobre enlaces vía satélite tiene una degradación significativa. Esto se debe principalmente a que el algoritmo ...
  • Mecanismo para evitar ataques por confabulación basados en code passing 

    Jaimez, Marc; Esparza Martín, Óscar; Hernández Gañán, Carlos; Parra Arnau, Javier (2009)
    Conference report
    Restricted access - publisher's policy
    Los agentes móviles son entidades software formadas por código, datos, itinerario y estado, que pueden migrar de host en host autónomamente ejecutando su código. A pesar de sus ventajas, los aspectos de seguridad restringen ...
  • MHT-based mechanism for certificate revocation in VANETs 

    Muñoz Tapia, José Luis; Esparza Martín, Óscar; Hernández Gañán, Carlos; Mata Diaz, Jorge; Alins Delgado, Juan José; Ganchev, Ivan (Springer, 2014-07)
    Part of book or chapter of book
    Restricted access - publisher's policy
    Vehicular Ad Hoc Networks (VANETs) require mechanisms to authenticate messages, identify valid vehicles, and remove misbehaving vehicles. A Public Key Infrastructure (PKI) can be utilized to provide these functionalities ...
  • Multipath TCP architecture for infotainment multimedia applications in vehicular networks 

    Reñé, Sergi; EXPOSITO, ERNESTO; Gineste, Mathieu Gineste; Alins Delgado, Juan José; Esparza Martín, Óscar (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Conference report
    Restricted access - publisher's policy
    The large deployment of Internet resources has facilitated the accelerated development of Intelligent Transport Systems (ITS) including a large diversity of distributed applications such as non-safety infotainment vehicular ...
  • NeuroCast: adaptive multi-source P2P video streaming application for wireless networks 

    Gañan, Carlos; Caubet Fernández, Juan; Mata Diaz, Jorge; Alins Delgado, Juan José; Esparza Martín, Óscar (2011)
    Conference report
    Restricted access - publisher's policy
    Streaming consists in distributing media to large audiences over a computer network. Providing a streaming service for wireless mobile nodes presents many challenges. A peer-to-peer (P2P) solution has the big advantage of ...