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In this article, we identify a flaw in Huang et al.&#39;s public key encryption with authorized equality test (The Computer Journal, 2015). More precisely, we point out that the proof of the indistinguishability under adaptive chosen ciphertext attack (IND-CCA2) security for their scheme has a serious flaw. We illustrate this flaw by presenting a polynomial time CCA2 attack on their scheme. We also pr...

CCA2 Attack and Modification of Huanget al.’s Public Key Encryption with Authorized Equality Test