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Zhenghao Zhang

  1. Time Stamp Attack in Smart Grid: Physical Mechanism and Damage Analysis.

    Fri, 01/13/2012 - 15:01 — SomNambul
    Authors: Husheng Li, Shuping Gong, Zhenghao Zhang, Aleksandar D. Dimitrovski
    Subjects: Cryptography and Security
    Abstract

    Many operations in power grids, such as fault detection and event location
    estimation, depend on precise timing information. In this paper, a novel time
    stamp attack (TSA) is proposed to attack the timing information in smart grid.
    Since many applications in smart grid utilize synchronous measurements and most
    of the measurement devices are equipped with global positioning system (GPS)
    for precise timing, it is highly probable to attack the measurement system by
    spoofing the GPS.

  2. A New Bound on the Performance of the Bandwidth Puzzle.

    Mon, 02/21/2011 - 16:01 — SomNambul
    Authors: Zhenghao Zhang
    Subjects: Cryptography and Security
    Abstract

    A bandwidth puzzle was recently proposed to defend against colluding
    adversaries in peer-to-peer networks. The colluding adversaries do not do
    actual work but claim to have uploaded contents for each other to gain free
    credits from the system. The bandwidth puzzle guarantees that if the
    adversaries can solve the puzzle, they must have spent substantial bandwidth,
    the size of which is comparable to the size of the contents they claim to have
    uploaded for each other. Therefore, the puzzle discourages the collusion.

Math-arch

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