机构地区: 西安电子科技大学通信工程学院综合业务网理论与关键技术国家重点实验室
出 处: 《电子学报》 2006年第1期177-179,共3页
摘 要: 对Lee等提出的可公开验证签密方案进行了密码分析和改进.研究了Lee方案的机密性和不可否认性,发现Lee方案的公开验证过程是以泄漏消息的机密性为代价的.提出对Lee方案的一个修改方案,修改方案克服了Lee方案中存在的安全漏洞,是一个安全的可公开验证签密方案.该修改方案的给出有助于“设计可公开验证签密方案”这一公开问题的尽快解决. Lee's signcryption scheme with public verifiability is cryptoanalyzed and improved. By studying the confidentiality and non-repudiation of Lee's scheme, the fact that the confidentiality of Lee's scheme is lost during its public verification is found. Lee 's scheme is modified, and the modification overcomes the security problem in Lee's scheme. So the modified scheme is a security signcryption scheme with public verifiability and it is of great benefit to solve the open problem "design signcryption schemes with public verifiability".