On the Matsumoto and Imai human identification scheme
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At Eurocrypt'91, Matsumoto and Imai presented a human identification scheme suitable for the human ability of memorising and processing a short secret. It protects against an intruder peeping as a user enters authentication information on a terminal connected to the authentication server. In this paper several attacks are discussed to investigate the security of their scheme. A modified scheme is proposed to avoid these attacks.