Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (1): 118-125.doi: 10.3969/j.issn.1000-565X.2015.01.019

• Computer Science & Technology • Previous Articles     Next Articles

Cryptanalysis of an IB-PRE Scheme with Source Hiding Property

Zheng Yu-lin1 Cai Yi2   

  1. 1. School of Computer Science and Engineering ， South China University of Technology ， Guangzhou 510640 ， Guangdong ， China ；2. School of Computer Engineering ， Guangzhou College of South China University of Technology ， Guangzhou 510800 ，Guangdong ， China
  • Received:2014-05-04 Revised:2014-07-12 Online:2015-01-25 Published:2014-12-01
  • Contact: 郑郁林（1978-），男，博士生，高级工程师，主要从事信息安全研究 . E-mail:gz.zheng.yulin@gmail.com
  • About author:郑郁林（1978-），男，博士生，高级工程师，主要从事信息安全研究 .
  • Supported by:
    Supported by the National Natural Science Foundation of China （ 61272413 ）

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Abstract: As Emura-IB-PRE ， an identity label-based proxy re-encryption scheme proposed by Emura et al. ， is of source hiding property and chosen ciphertext security in random oracle model ， a chosen ciphertext security method to attack Emura-IB-PRE scheme is proposed ， and Emura-IB-PRE is proved invalid in resisting the chosen ciphertext attack. In order to solve this problem ， an improved scheme named E-SH-IB-PRE is presented and the corresponding security proof is given. The results indicate the presented scheme is secure against chosen ciphertext attack with source hiding property in random oracle model ， and that the principle ， i.e. ， the first level ciphertext can be publicly verified by proxy ， is important for proxy re-encryption schemes.

Key words: proxy re-encryption, encryption algorithm, source hiding property, chosen ciphertext attack