International Association
for Cryptologic Research

Identity Based Encryption (IBE) systems are often constructed using pairings or lattices. Three exceptions are due to Cocks in 2001, Boneh, Gentry and Hamburg in 2007, and Paterson and Srinivasan in 2009. In this paper, we propose an efficient identity-based encryption scheme of which the security is rooted in the intractability assumption of integer factorization. We believe that our construction has some essential differences from all existing IBEs.