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针对现有云环境中密文策略属性加密都依赖于一个可信密钥生成机构的问题,提出一种无可信第三方的密文策略属性加密方案.该方案使密钥生成机构在负责用户认证和属性管理时,必须与另一方(如云服务提供商)通过安全双方计算协议来生成密钥,而它们中的任何一方都没有能力单独解密密文.安全性分析表明,所提出的方案能够解决单独密钥生成机构所带来的安全性问题,而且用户端仅需一次加法运算,提高了计算效率.
Aiming at the problem of encrypting ciphertext strategy attributes in existing cloud environment depending on a trusted key generation mechanism, a ciphertext strategy attribute encryption scheme with no credible third party is proposed. This scheme makes the key generation agency responsible for the user Authentication and attribute management, the key must be generated by a secure two-party computing protocol with another party, such as a cloud service provider, and none of them has the ability to decrypt the ciphertext separately. Security analysis shows that the proposed scheme Can solve the security problem brought by the single key generation mechanism, and the user end only needs to add one operation at a time, which improves the calculation efficiency.