Paper 2010/316

A New Human Identification Protocol and Coppersmith's Baby-Step Giant-Step Algorithm

Hassan Jameel Asghar, Josef Pieprzyk, and Huaxiong Wang


We propose a new protocol providing cryptographically secure authentication to unaided humans against passive adversaries. We also propose a new generic passive attack on human identification protocols. The attack is an application of Coppersmith's baby-step giant-step algorithm on human identification protcols. Under this attack, the achievable security of some of the best candidates for human identification protocols in the literature is further reduced. We show that our protocol preserves similar usability while achieves better security than these protocols. A comprehensive security analysis is provided which suggests parameters guaranteeing desired levels of security.

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Publication info
Published elsewhere. This is the full version of the paper with the same title to appear in J. Zhou and M. Yung (Eds.): Applied Cryptography and Network Security, ACNS 2010, LNCS 6123, Springer, 2010.
Human Computer CryptographyHuman Identification ProtocolsEntity Authenticaion.
Contact author(s)
hassan jameel @ gmail com
2010-05-27: received
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      author = {Hassan Jameel Asghar and Josef Pieprzyk and Huaxiong Wang},
      title = {A New Human Identification Protocol and Coppersmith's Baby-Step Giant-Step Algorithm},
      howpublished = {Cryptology ePrint Archive, Paper 2010/316},
      year = {2010},
      note = {\url{}},
      url = {}
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