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학술저널
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한국정보보호학회 정보보호학회논문지 情報保護學會論文誌 Vol.14 No.4
발행연도
2004.8
수록면
75 - 90 (16page)

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At Asiacrypt 2003, Shin et al., have proposed a new class for Authenticated Key Establishment (AKE) protocol named Leakage-Resilient AKE (LR-AKE). The authenticity of LR-AKE is based on a user's password and his/her stored secrets in both client side and server side. In their LR-AKE protocol, no TRM (Tamper Resistant Modules) is required and leakage of the stored secrets from any side does not reveal any critical information on the password. This property is useful when the following situation is considered:(1) Stored secrets may leak out;(2) A user communicates with a lot of servers;(3) A user remembers only one password. The other AKE protocols, such as SSL/TLS and SSH (based on PKI), Password-Authenticated Key Exchange (PAKE) and Threshold-PAKE (T-PAKE), do not satisfy that property under the above-mentioned situation since their stored secrets (or, verification data on password) in either the client or the servers contain enough information to succeed in retrieving the relatively short password with off-line exhaustive search. As of now, the LR-AKE protocol is the currently known solution.
In this paper, we prove its security of the LR-AKE protocol in the standard model. Our security analysis shows that the LR-AKE protocol is provably secure under the assumptions that DDH (Decisional Diffie-Hellman) problem is hard and MACs are selectively unforgeable against partially chosen message attacks (which is a weaker notion than being existentially unforgeable against chosen message attacks).

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ABSTRACT
Ⅰ. Introduction
Ⅱ. Review of LR-AKE
Ⅲ. Security Model and Definitions
Ⅳ. Formal Security Proof
Ⅴ. Conclusion
Reference
〈著者紹介〉

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