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Title

Cryptanalysis of Sui et al.'s Second ID-based Key Issuing Protocol without Key Escrow

Author

Hyunjue Kim, Seungjoo Kim, Dongho Won

Vol. 6  No. 1  pp. 247~250

Abstract

Recently, Sui et al. proposed two separable and anonymous ID-based key issuing protocols without secure channel and claimed that their second protocol avoids the key escrow problem. However, in this paper, impersonation attack is proposed to show that Sui et al.’s second protocol is not free from the key escrow problem. We also show that their protocol cannot detect the able to access of illegitimate users instead it suffers from the stolen-verifier attack.

Keywords

ID-based cryptography, Key escrow problem, Secure key issuing

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