Chosen-ciphertext secure multi-hop identity-based conditional proxy re-encryption with constant-size ciphertexts

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• 作者：Kaitai Liang^a ; ^{kliang4-c@my.cityu.edu.hk" class="auth_mail} ; Cheng-Kang Chu^b ; ^{chengkangchu@gmail.com" class="auth_mail} ; Xiao Tan^a ; ^{xiaotan4@gapps.cityu.edu.hk" class="auth_mail} ; Duncan S. Wong^a ; ^{duncan@cityu.edu.hk" class="auth_mail} ; Chunming Tang^c ; ^{ctang@gzhu.edu.cn" class="auth_mail} ; Jianying Zhou^b ; ^{jyzhou@i2r.a-star.edu.sg" class="auth_mail}
• 关键词：Conditional proxy re-encryption ; Identity-based proxy re-encryption ; Bilinear map ; Chosen-ciphertext security ; Constant size ciphertext
• 刊名：Theoretical Computer Science
• 出版年：19 June 2014
• 年：2014
• 卷：539
• 期：Complete
• 页码：87-105
• 全文大小：448 K

文摘

Proxy Re-Encryption (PRE) allows one user to delegate the decryption rights of his/her ciphertexts to another user. Since the introduction of Multi-Hop Identity-Based PRE (MH-IBPRE) by Green and Ateniese, the ciphertext size and the decryption complexity grow linearly in the number of re-encryption “hops”. In this paper, for the first time, we propose an MH-IBPRE that maintains the (constant) ciphertext size and computational complexity regardless of the number of re-encryption hops. Moreover, our scheme is bidirectional and also supports conditional re-encryption. The scheme is proven secure against selective identity and chosen-ciphertext attacks and collusion resistant in the standard model. As of independent interest, we also show that the conditional re-encryption can also be extended to a set of conditions.