On the Security of Secure Server-Designation Public Key Encryption with Keyword Search
Xi-Jun Lin, Lin Sun, Haipeng Qu, Dongxiao Liu · The Computer Journal · 2018
Recently, a new framework, called secure server-designation public key encryption with keyword search (SPEKS), was proposed by Chen to withstand online keyword guessing attack. Moreover, Chen proposed a concrete scheme (IBE,TE)-2-SPEKS and proved that their scheme meets trapdoor indistinguishability. In this comment, we point out that the trapdoor, in fact, can be distinguished by the adversary.