Analysis and improvement of two signcryption schemes

作者：Zhang Ming Wu^*; Yang Bo; Zhou Min; Zhang Wen Zheng

来源：Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology, 2010, 32(7): 1731-1736.

DOI：10.3724/SP.J.1146.2009.00911

• Chosen-plaintext attack
• Ciphertexts
• Cryptographic primitives
• Digital Signature
• Multi-signcryption
• Public verifiability
• Security properties
• Semantic security
• Signcryption
• Signcryption schemes
• Unforgeability

Signcryption is a cryptographic primitive that simultaneously performs the functions of both digital signature and encryption in a way that is more efficient than signing and encrypting separately. Multi-signcryption is an extension of signcryption scheme for multi-signers performing together the signcryption operation on the same message. Two signcryption schemes, including signcryption proposed by Li et al. (2006), and multi-signcryption scheme by Zhang et al. (2008), are proved not to resist on chosen-plaintext attack and chosen-identity attack under the CPA adversary. Furthermore, the improved signcryption and multi-signcryption schemes are put forward that providing security properties including CPA, CCA2, and public verifiability, which deploy the message hidden method to resist on the chosen-plaintext attack, and multiple signer members authentication to protect the multi-signers' ciphertexts not be interpolated.

• 出版日期2010
• 单位华南农业大学