Generic Construction of Dual‐Server Public Key Authenticated Encryption With Keyword Search

In this paper, we propose a generic construction of dual‐server public key authenticated encryption with keyword search (DS‐PAEKS) from PAEKS, public key encryption, and signatures. We also show that previous DS‐PAEKS scheme is vulnerable by providing a concrete attack. That is, the proposed generic construction yields the first DS‐PAEKS schemes. Our attack with a slight modification works against previous dual‐server public key encryption with keyword search (DS‐PEKS) schemes.