International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: HB#: Increasing the Security and Efficiency of HB+

Henri Gilbert
Matthew J.B. Robshaw
Yannick Seurin
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Abstract: The innovative HB+ protocol of Juels and Weis [10] extends device authentication to low-cost RFID tags. However, despite the very simple on-tag computation there remain some practical problems with HB+ and despite an elegant proof of security against some limited active attacks, there is a simple man-in-the-middle attack due to Gilbert et al. [8]. In this paper we consider improvements to HB+ in terms of both security and practicality. We introduce a new protocol that we denote random-HB#. This proposal avoids many practical drawbacks of HB+, remains provably resistant to attacks in the model of Juels and Weis, and at the same time is provably resistant to a broader class of active attacks that includes the attack of [8]. We then describe an enhanced variant called HB# which offers practical advantages over HB+.
  title={HB#: Increasing the Security and Efficiency of HB+},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / HB+, RFID tags, authentication, LPN, Toeplitz matrix},
  note={Published at Eurocrypt 2008 13900 received 22 Jan 2008},
  author={Henri Gilbert and Matthew J.B. Robshaw and Yannick Seurin},