Abstract
This paper analyzes several kinds of S/KEY One-time Password (OTP) identity authentication schemes, and designs a new OTP identity authentication scheme with the increasing hash chains. The new scheme overcomes the weakness of common OTP schemes which need to reset parameters when used, consequently reduces the sever burden, and does not need any kinds of assists provided by additional hardware or serves. Furthermore, it can realize the client - server authentication and resist the common network attacks.
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