Abstract
It’s easy to access Internet resources in the cloud environment. And it’s important to protect the legal users’ privacy and confidentiality. Recently, Hou and Wang proposed a robust and efficient user authentication scheme based on elliptic curve cryptosystem. Their scheme was practical and easy to implement. They claimed that their scheme could against off-line password guessing, DoS, server spoofing, replay, parallel session and impersonation attacks. In this article, we will show that Hou-Wang’s scheme is vulnerable to the guessing attack with smart card. In this article, we also propose an improved Hou-Wang’s user authentication scheme to withstand the vulnerability in their scheme.
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