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In PKC’04, a signcryption scheme with key privacy was proposed by Libert and Quisquater. Along with the scheme, some security models were defined with regard to the signcryption versions of confidentiality, existential unforgeability and ciphertext anonymity (or key privacy). The security of their scheme was also claimed under these models. In this paper, we show that their scheme cannot achieve the...
In Information Processing Letters 2006, Tan pointed out that the anonymous signcryption scheme proposed by Yang, Wong and Deng (YWD) in ISC 2005 provides neither confidentality nor anonymity. However, no discussion has been made on whether YWD scheme can be made secure. In this paper, we propose a modification of YWD scheme which resolves the security issues of the original scheme without sacrificing...
We propose a new generic construction for signcryption and show that it is secure under the security models which are comparable to the security against adaptive chosen ciphertext attacks for public key encryption and the existential unforgeability against chosen message attacks for signature. In particular, the security models also capture the notion of insider security. The generic construction...
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