SCCR: A generic approach to simultaneously achieve CCA security and collusion-resistance in proxy re-encryption

Jun Shao, Zhenfu Cao, Peng Liu

Research output: Contribution to journalArticle

14 Scopus citations


By allowing a proxy to blindly perform meaningful transformations from one ciphertext to another, proxy re-encryption (PRE) is an important cryptographic primitive in many applications, such as encrypted email forwarding and distributed file system. Due to its usefulness, various PRE schemes have been proposed; however, only one can simultaneously achieve chosen ciphertext security (CCA security) and collusion-resistance. When such schemes are deployed, lack of CCA security will cause secret leaking, and lack of collusion-resistance will cause non-repudiation damage. In this paper, we propose a novel approach (denoted SCCR) to simultaneously achieve CCA security and collusion-resistance in PRE, which faces daunting new challenges. We address these challenges by using CCA-secure (2, 2) threshold cryptosystem to obtain public verifiability, and the method of key management in identity-based encryption (IBE) to achieve collusion-resistance. These two novel techniques have not been yet used in any previous PRE schemes. A unique characteristic of SCCR is that it is a generic construction which has more advantages than a concrete PRE scheme does.

Original languageEnglish (US)
Pages (from-to)122-135
Number of pages14
JournalSecurity and Communication Networks
Issue number2
Publication statusPublished - Jan 1 2011


All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Networks and Communications

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