摘要
代理重加密方案(PRE)使代理者能够把用委托者公钥加密的密文转换成受委托者的密文,而代理者并不能得到明文。由于这个优良的特性,使得代理重加密广泛应用于加密后的信息通信领域,比如被加密的电子邮件传输等。但是,现有的条件代理重加密方案都不能提供密钥保密的特性。为此,本文基于3-QDBDH和Truncated q-ABDHE问题,提出第一个标准模型下达到CCA安全的密钥保密的条件重加密方案。
In proxy re-encryption,a proxy can transform the ciphertext under the delegator＇s public key into another ciphertext that the delegatee can decrypt by its own private key.However,the proxy cannot access the plaintext.Due to its transformation property,proxy re-encryption can be used in many encrypted communication applications,such as encrypted email forwarding.However none of the existing conditional proxy re-encryption schemes satisfies key private.Based on the decision bilinear Diffie-Hellman assumption and the truncated q-ABDHE assumption,this paper proposes the first such CCA security conditional proxy re-encryption in the standard model.
出处
《计算机与现代化》
2012年第11期134-141,共8页
Computer and Modernization
基金
国家自然科学基金资助项目(61173136)
江苏省高校优势学科建设工程资助项目
公益性行业(气象)专项经费资助项目(201206073)
关键词
条件代理重加密
密钥保密
标准模型
conditional proxy re-encryption
key private
standard model
