SCCR: a generic approach to simultaneously achieve CCA security and collusion-resistance in proxy re-encryption
Article first published online: 6 MAY 2009
Copyright © 2009 John Wiley & Sons, Ltd.
Security and Communication Networks
Volume 4, Issue 2, pages 122–135, February 2011
How to Cite
Shao, J., Cao, Z. and Liu, P. (2011), SCCR: a generic approach to simultaneously achieve CCA security and collusion-resistance in proxy re-encryption. Security Comm. Networks, 4: 122–135. doi: 10.1002/sec.109
- Issue published online: 6 MAY 2009
- Article first published online: 6 MAY 2009
- National Natural Science Foundation of China. Grant Numbers: 60673079, 60773086, 60873217
- Research Fund for the Doctoral Program of Higher Education of China. Grant Number: 20060248008
- unidirectional proxy re-encryption;
- CCA security;
- generic construction;
- standard model
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. Copyright © 2009 John Wiley & Sons, Ltd.