Browsing by Author "Daza, Vanesa"

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  • Leveraging bitcoin testnet for bidirectional botnet command and control systems
    Franzoni, Francesco; Abellán Álvarez, Iván; Daza, Vanesa (2020)
    Over the past twenty years, the number of devices connected to the Internet grew exponentially. Botnets bene ted from this rise to increase their size and the magnitude of their attacks. However, they still have a weak ...
  • MOOCs en España. Panorama actual de los Cursos Masivos Abiertos en Línea en las universidades españolas
    Oliver Riera, Miquel; Hernández Leo, Davinia; Daza, Vanesa; Martín i Badell, Carles; Albó, Laia (2014-01)
    Podemos afirmar que España se ha situado en muy poco tiempo, y de forma sorprendente, en el/ngrupo líder de países que más actividad están generando entorno a los cursos masivos en línea/nabiertos o MOOCs (del inglés Massive ...
  • New privacy practices for blockchain software
    Bellés-Muñoz, Marta; Baylina, Jordi; Daza, Vanesa; Muñoz-Tapia, José L. (Institute of Electrical and Electronics Engineers (IEEE), 2022)
    In this article, we present the software tools we have implemented to bring complex privacy technologies closer to developers and to facilitate the implementation of privacyenabled blockchain applications
  • Offline scaling of IoT devices in IOTA blockchain
    Rawat, Abhimanyu; Daza, Vanesa; Signorini, Matteo (MDPI, 2022)
    An increased pattern of hidden Internet of Things (IoT) devices has been observed. Due to the increased number of security attacks, a large number of IoT devices are disappearing from the public internet. Operating blockchain ...
  • On codes, matroids, and secure multiparty computation from linear secret-sharing schemes
    Cramer, Ronald; Daza, Vanesa; Gracia, Ignacio; Jiménez Urroz, Jorge; Leander, Gregor; Martí, Jaume, 1943-; Padró, Carles (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    Error-correcting codes and matroids have been widely used in the study of ordinary secret sharing schemes. In this paper, the connections between codes, matroids, and a special class of secret sharing schemes, namely, ...
  • On dynamic distribution of private keys over MANETs
    Daza, Vanesa; Morillo, Paz; Ràfols, Carla (Elsevier, 2007)
    Identity-Based cryptography has been proposed in mobile ad-hoc networks (MANETs) to provide security. However, the figure of the Private Key Generator (PKG) is not adequate in the MANET setting, since it may not be reachable ...
  • On the computational security of a distributed key distribution scheme
    Daza, Vanesa; Herranz, Javier; Sáez, Germán (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    In a distributed key distribution scheme, a set of servers helps a set of users in a group to securely obtain a common key. Security means that an adversary who corrupts some servers and some users has no information about ...
  • Performance analysis of a multiuser multi-packet transmission system for WLANs in non-saturation conditions
    Bellalta, Boris; Faridi, Azadeh; Barceló Vicens, Jaume; Daza, Vanesa; Oliver Riera, Miquel (Elsevier, 2014)
    Multiuser Multi-Packet Transmission (MPT) from an Access Point (AP) equipped with multiple antennas to multiple single-antenna nodes can be achieved by exploiting the spatial dimension of the channel. In this paper we ...
  • El Programa EnginyCat a l’Escola Superior Politècnica: mentoría, suport acadèmic i adaptació al nou context formatiu
    Moreno, Verónica; Hernández Leo, Davinia; Daza, Vanesa (2012-07)
    L’Escola Superior Politècnica (ESUP) de la Universitat Pompeu Fabra, amb el suport del Consell Social va iniciar el curs 2009-2010 un Pla de Mentors (EnginyCat) adreçat als estudiants de primer curs dels Graus TIC. Aquesta ...
  • SANS: self-Sovereign authentication for network slices
    Salleras, Xavier; Daza, Vanesa (Hindawi, 2020)
    5G communications proposed significant improvements over 4G in terms of efficiency and security. Among these novelties, the 5G network slicing seems to have a prominent role: deploy multiple virtual network slices, each ...
  • Shorter quadratic QA-NIZK proofs
    Daza, Vanesa; González, Alonso; Pindado, Zaira; Ràfols, Carla; Silva, Javier (Springer, 2019)
    Despite recent advances in the area of pairing-friendly Non-Interactive Zero-Knowledge proofs, there have not been many efficiency improvements in constructing arguments of satisfiability of quadratic (and larger degree) ...
  • SoK: network-level attacks on the bitcoin P2P network
    Franzoni, Federico; Daza, Vanesa (Institute of Electrical and Electronics Engineers (IEEE), 2022)
    Over the last decade, Bitcoin has revolutionized the global economic and technological landscape, inspiring a new generation of blockchain-based technologies. Its protocol is today among the most influential for cryptocurrencies ...
  • Succinct arguments: efficiency, assumptions and trade-offs
    Zacharakis, Alexandros (Universitat Pompeu Fabra, 2022-10-20)
    Succinct non-interactive arguments (snarks) are cryptographic constructions that allow a prover to convince a verifier about the validity of a statement regarding some computation. We consider these objects from the ...
  • Towards an internet of trust: issues and solutions for identification and authentication in the internet of things
    Signorini, Matteo (Universitat Pompeu Fabra, 2016-02-08)
    La Internet de las Cosas está avanzando lentamente debido a la falta de confianza en dispositivos que puedan interactuar de manera autónoma. Además, se requieren nuevos enfoques para mitigar o al menos paliar ataques de ...
  • Trustworthy privacy-preserving car-generated announcements in vehicular ad hoc networks
    Daza, Vanesa; Domingo-Ferrer, Josep; Sebe, Francesc; Viejo, Alexandre (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    Vehicular ad hoc networks (VANETs) allow vehicle-to-vehicle communication and, in particular, vehicle-generated announcements. Provided that the trustworthiness of such announcements can be guaranteed, they can greatly ...
  • Twisted Edwards elliptic curves for zero-knowledge circuits
    Bellés-Muñoz, Marta; Whitehat, Barry; Baylina, Jordi; Daza, Vanesa; Muñoz-Tapia, José L. (MDPI, 2021)
    Circuit-based zero-knowledge proofs have arose as a solution to the implementation of privacy in blockchain applications, and to current scalability problems that blockchains suffer from. The most efficient circuit-based ...
  • Updateable inner product argument with logarithmic verifier and applications
    Daza, Vanesa; Ràfols, Carla; Zacharakis, Alexandros (Springer, 2020)
    We propose an improvement for the inner product argument of Bootle et al. (EUROCRYPT’16). The new argument replaces the unstructured common reference string (the commitment key) by a structured one. We give two instantiations ...
  • Zero-knowledge proofs for self-sovereign identities in decentralized services
    Salleras, Xavier (Universitat Pompeu Fabra, 2023-03-23)
    Telecommunication systems such as mobile communications are evolving over time, and thanks to that, many digital services have arisen in the last decade. Usually, these services ask their users to provide sensitive information ...
  • ZPiE: Zero-knowledge proofs in embedded systems
    Salleras, Xavier; Daza, Vanesa (MDPI, 2021)
    Zero-Knowledge Proofs (ZKPs) are cryptographic primitives allowing a party to prove to another party that the former knows some information while keeping it secret. Such a premise can lead to the development of numerous ...

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