Security Analysis of Two Signcryption Schemes

• Main Authors: WANG, Guilin, DENG, Robert H., KWAK, DongJin, MOON, Sangjae
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2004
• Subjects: Signcryption; digital signature; encryption; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/559; https://ink.library.smu.edu.sg/context/sis_research/article/1558/viewcontent/Wang2004_Chapter_SecurityAnalysisOfTwoSigncrypt.pdf
• Institution: Singapore Management University

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 Huang-Chang convertible signcryption scheme, and the Kwak-Moon group signcryption scheme. 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.