【摘 要】
：
Identity-Based Proxy Re-Encryption(IB-PRE)is a cryptographic primitive that permits a semi-trusted proxy to convert the ciphertext encrypted under Alices identity into Bobs ciphertext of the same mess
【机 构】
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Key Lab of Network and Information Security,Engineering University of Chinese Armed Police Force,Xi
【出 处】
：
第十二届中国可信计算与信息安全学术会议
论文部分内容阅读
Identity-Based Proxy Re-Encryption(IB-PRE)is a cryptographic primitive that permits a semi-trusted proxy to convert the ciphertext encrypted under Alices identity into Bobs ciphertext of the same message without any knowledge of the involved plaintext message.Latticebased cryptography is a powerful cryptographic system with its potential resistance to quantum analysis and low computational complexity.The main contribution of this paper is to construct a multi-hop and unidirectional IB-PRE from lattices.We split the functions of decryption and ciphertext transformation separately,and design the double private keys mechanism,where two keys are generated for each user,one key is used to decrypt the ciphertext by Pre-Image Sampling technique,and the other is used to generate the re-encryption key by Bonsai Trees technique.The generation of the re-encryption key is non-interactive and collusion resistant.Moreover,its IND-sID-CPA security over the decisional Learning With Errors(LWE)hardness assumption under the standard model is proved.Compared with some previous IB-PRE schemes from Bilinear Pairings,the format of ciphertext after transformation in our scheme remains unchanged and its length will not grow linearly with the transformation times,furthermore,it can also resist quantum analysis.Compared with some existing IB-PRE schemes from lattices with similar properties,the space of message in our scheme is a vector of length l and the encryption process enjoys a lower encryption blowup factor.At last,a proof-of-concept implementation is given.
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