Cryptanalysis of Identity-based Signcryption Scheme for Multi-receiver
Ning Liu · Jisuanji gongcheng · 2009
Aiming at an identity-based signcryption scheme for multi-receiver beginning with the security attribute,this paper studies the security property of this scheme.It is proved that this scheme is neither semantically secure nor unforgeable with two successful attacks.There effective algorithms for forgery of any message or identity.An improved identity-based signcryption scheme for multi-receiver is proposed with security proof.