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Anonymous receiver encryption is an important cryptographic primitive. It can protect the privacy of the receiver. In 2010, Fan et al proposed an anonymous multi-receiver 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 the authors provided an improved scheme to fix it and showed that the improved scheme was secure. Unfortunately, they pointed out that Wang et al's improved scheme didn't satisfy the receiver's anonymity by analyzing the security of the scheme yet.
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