Cryptology ePrint Archive: Report 2005/054

Comment on cryptanalysis of Tseng et al.s authenticated encryption schemes

Yi-Hwa Chen and Jinn-Ke Jan

Abstract: Recently, Xie and Yu proposed a forgery attack on the Tseng et als authenticated encryption schemes and showed that their schemes are not secure in two cases: the specified verifier substitutes his secret key, or the signer generates the signature with these schemes for two or more specified verifiers. In addition, Xie and Yu made a small modification for the Tseng et als schemes and claimed that the modified schemes can satisfy the security requirement. However, we show that the modified schemes are still insecure.

Category / Keywords: public-key cryptography / Cryptography; Authenticated encryption; Message linkage; Self-certificated public key

Date: received 22 Feb 2005, last revised 26 Feb 2005, withdrawn 18 Mar 2005

Contact author: yh_chen at seed net tw

Available format(s): (-- withdrawn --)

Note: Revise the title again.

Version: 20050319:063321 (All versions of this report)

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