Abstract: This paper analyzes the security issues of an efficient identity-based signcryption scheme S-IDSC. It indicates its lack of the security characteristics of forward security and public verifiability. An improved signcryption scheme E-IBSC is proposed. Security analysis shows that E-IBSC can satisfy the generic security requirements of signcryption schemes. Performance analysis shows that E-IBSC maintains the equivalent computational overheads with only additional acceptable communication load.

Key words: identity-based, signcryption, bilinear parings, forward security, public verifiability

摘要： 分析一种基于身份的高效签密方案S-IDSC的安全特性，指出其不满足前向安全性和公开验证性。为此，提出一种改进的基于身份的高效签密方案E-IBSC。安全性分析表明，改进方案能满足签密方案的一般安全要求。性能分析表明，改进方案保持了与原方案相当的计算复杂度，增加的通信负载在可接受的范围内。

关键词: 基于身份, 签密, 双线性对, 前向安全性, 公开验证性

CLC Number: 

• TP309