基于动态属性的数字签名方案

摘要

基于属性的数字签名方案能很好地实现用户身份的隐藏。但所提出的签名方案中，用户属性都是静态的，当系统中的成员属性发生变更后，没有相应的修改机制，需要重新分配属性密钥，这将为系统增添极大负担。在实际应用中存在问题。基于条件加密的思想，设计了一个具有动态属性的数字签名方案，该方案能在该用户满足某属性后，由认证方给用户提供签名，并让用户自行计算其属性密钥。对签名方案的安全性进行了讨论。%The user’s privacy can be well protected using attribute-based signature scheme. But the attributes are static in all attribute-based signature schemes, which are due to certain problems in practical applications:when the member’s attribute has been changed, there is no corresponding mechanism to re-assign the attributes key, which will cause tremendous burden. Based on conditions-based encryption, this paper develops a dynamic attribute-based signature scheme. User is allowed to calculate its own attributes key in the scheme once it satisfies certain attribute after the authenticating party’s digital signature is given. The security of the scheme is discussed.