Security Analysis of Two Signcryption Schemes

Signcryption is a new cryptographic primitive that performs signing and encryption simultaneously, at a cost significantly lower than that required by the traditional signature-then-encryption approach. In this paper, we present a security analysis of two such schemes: the HuangChang convertible signcryption scheme [12], and the Kwak-Moon group signcryption scheme [13]. Our results show that both schemes are insecure. Specifically, the Huang-Chang scheme fails to provide confidentiality, while the Kwak-Moon scheme does not satisfy the properties of unforgeability, coalition-resistance, and traceability.

• Type: Conference
• Year: 2004
• Where: ISW
• Authors: Guilin Wang, Robert H. Deng, Dong Jin Kwak, Sang-Jae Moon
• Keywords: Convertible Signcryption Scheme, Group Signcryption Scheme, ISW 2004, Signcryption Scheme