Cryptology ePrint Archive: Report 2009/052

ON THE SECURITY OF TWO RING SIGNCRYPTION SCHEMES

S.Sree Vivek and S.Sharmila Deva Selvi and C.Pandu Rangan

Abstract: Ring signcryption is a cryptographic primitive, that allows an user to send a message in confidential, authentic and anonymous way, i.e. the recipient of the message is convinced that the message is valid and it comes from one of the ring member, but does not know the actual sender. In this paper, we show attacks on ring signcryption schemes by Li et al. \cite{FHY08} and Chung et al. \cite{ChungWLC06}. We demonstrate anonymity and confidentiality attack on the scheme by Li et al. \cite{FHY08} and confidentiality attack on the scheme by Chung et al. \cite{ChungWLC06}.

Category / Keywords: Identity-based, ring signcryption, bilinear pairing, cryptanalysis

Publication Info: Accepted in Secrypt 2009

Date: received 2 Feb 2009, last revised 1 May 2009

Contact author: ssreevivek at gmail com,sharmioshin@gmail com

Available formats: Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Note: The previous version of the paper was revised because two of the breaks were found in some other published papers

Version: 20090501:162527 (All versions of this report)

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