A Mutual Remote Authentication Scheme Using Smart Cards
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A remote authentication scheme using smart cards proposed by Hu et al. is studied, and found that this scheme easily suffers replay attack and guessing attack. A modified scheme based on inquiry/response and user access secret is proposed,which can avoid replay attack, password guessing attack, masquerading server attack effectively. Moreover, it has a good repairability. The efficiency of Hu’s scheme and the efficiecy of the modified scheme are compared finally. The modified scheme retains the advantage of using smart cards by the original scheme while strengthens the security.