JoWUA

Abstract

In the Identity-based encryption (IBE) scheme user’s public key is exactly the user’s identity, it thus doesn’t need to use expensive certificates in certified public key cryptography. Hierarchical identity-based encryption (HIBE) is the extension of IBE to overcome the bottleneck problem of the Private Key Generator and to increase the security of the IBE scheme. However, similar to IBE scheme, HIBE scheme still doesn’t support flexible one-to-many encrypting. To deal with this problem, Identity-based encryption with wildcards (WIBE) was introduced by Abdalla et al at ICALP conference in 2006. Since then, many WIBE schemes have been introduced in the literature. In this work, we continue in this line of work to introduce a novel WIBE scheme. Our proposed scheme is an improvement of all existing WIBE schemes in term of efficiency.