Key updating technique in identity-based encryption

Authors:
Shengli Liu;Yu Long;Kefei Chen
Affiliations:
Dept. of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;Dept. of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;Dept. of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
Venue:
Information Sciences: an International Journal
Year:
2011

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Abstract

Key revocation is critical for the practicality of any public key cryptosystem and identity-based encryption (IBE) system. When a user's private key is compromised, it is important for him/her to revoke his/her key. Up to now, little work has been published on key revocation in IBE systems. We propose a low-complexity key update technique to solve the revocation problem in an IBE system in which any revoked user is able to re-join the system without changing his or her identity or re-setup the system.