| Summary: | 碩士 === 朝陽科技大學 === 資訊工程系 === 104 === There are already a lot of single-server authentication schemes, but with advances in network technology, the user may need to log on to multiple servers to access services. Thus, some multi-server authentication schemes have been proposed. The Elliptic Curve Cryptosystem(ECC) is with the advantages of efficient communication and computation. Therefore, some researchers proposed schemes to integrate remote user authentication protocol for multi-server architecture and the Elliptic Curve Cryptosystem. Although their scheme remedies the security weakness of previous schemes and reduces the cost of computing, these schemes are still insecure. It verifies login message and calculates session key in a wrong way, as well as suffers from the attacks of offline guessing passwords. Based on ECC and multi-server architecture, this paper proposes a new user authentication scheme. The proposed scheme is secure under several attacks as shown in the paper.
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