Agnes Hui Chan

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In this paper, we address the problem of countering the control channel jamming in wireless communication systems. Targeting control traffic on a system like GSM (e.g., BCCH channel) leads to smart attacks that are four orders of magnitude more efficient than blind jamming. We propose several schemes based on coding theory and its applications that can(More)
Pseudorandom binary sequences with high linear complexity and low correlation function values are sought in many applications of modern communication systems. A new family of pseudorandom binary sequences, cascaded GMW sequences, is constructed. These sequences are shown to share many desirable correlation properties with the GMW sequences of Gordon, Mills,(More)
This paper investigates the design of S-boxes used for combining linear feedback shift register (LFSR) sequences in combination generators. Such combination generators have higher throughput than those using Boolean functions as the combining functions. However, Sboxes tend to leak more information about the LFSR sequences than Boolean functions. To study(More)
In this paper, we consider the problem of mutually authenticated key exchanges between a low-power client and a powerful server. We show how the Jakobsson-Pointcheval scheme proposed recently [15] can be compromised using a variant of interleaving attacks. We also propose a new scheme for achieving mutually authenticated key exchanges. The protocol is(More)