On the Security of Provably Secure Multi-Receiver ID-Based Signcryption Scheme

Chik-How TAN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.7   pp.1836-1838
Publication Date: 2008/07/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.7.1836
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Cryptography and Information Security
cryptography,  identity-based signcryption,  

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Recently, Duan and Cao proposed an multi-receiver identity-based signcryption scheme. They showed that their scheme is secure against adaptive chosen ciphertext attacks in the random oracle model. In this paper, we show that their scheme is in fact not secure against adaptive chosen ciphertext attacks under their defined security model.