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New Identity Based Proxy Re-Encryption Scheme from Lattices

摘要:Identity-Based Proxy Re-Encryption (IB-PRE) allows a semi-trusted proxy to convert the ciphertext encrypted under Alice’s identity into Bob’s ciphertext of the same message without leaking plaintext. Lattice-based cryptography enjoys potential resistance to quantum analysis and low computational complexity. A multi-hop and unidirectional IB-PRE from lattices is presented. 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) assumption under the standard model is proved. Compared with some previous IBPRE schemes from Bilinear Pairings, the format of transformed ciphertext in our scheme remains unchanged, furthermore, it can also resist quantum analysis. Compared with some existing IB-PRE schemes from lattices with similar properties, the space of the message in our scheme is a vector of length l and the encryption process remains a lower encryption blowup factor. At last, a proof-of-concept implementation is provided.

关键词:
  • lattices  
  • bonsai  
  • trees  
  • collusion  
  • resistance  
作者:
Liqiang; Wu; Xiaoyuan; Yang; Minqing; Zhang; Longfei; Liu
单位:
Key; Lab; of; Network; and; Information; Security; Engineering; University; of; Chinese; Armed; Police; Force; Xi’an; 710086; China; Key; Lab; of; Computer; Network; and; Information; Security; Xi; Dian; University; Xi’an; 710071; China
刊名:
中国通信

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期刊名称:中国通信

中国通信杂志紧跟学术前沿,紧贴读者,国内刊号为:11-5439/TN。坚持指导性与实用性相结合的原则,创办于2004年,杂志在全国同类期刊中发行数量名列前茅。

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