Comment an Anonymous Multi-receiver Identity-based Encryption Scheme.
Junshuai Zhang, Yi-ling Cui · 2012
Abstract—Anonymous receiver encryption is an important cryptographic primitive. It can protect the privacy of the receiver. In 2010, Fan et al proposed an anonymous multireceiver ID-based encryption by using Lagrange interpolating polynomial. Recently, Wang et al showed that Fan et al’s scheme satisfied anonymity of the receivers. Then they provided an improved scheme to fix it and showed that the improved scheme was secure. Unfortunately, we pointed out that Wang et al’s improved scheme did’t satisfy the receiver’s anonymity by analyzing the security of the scheme yet. After analyzing the reason to produce such flaw, we give an improved method to repair it and show that our improved scheme satisfies the receiver’s anonymity, and the improved scheme has advantage over Wang et al’s scheme in terms of computational cost. Keywords: Anonymity, multi-receiver ID-based encryption, attack, the improved method