Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited

Public key authenticated encryption with keyword search (PAEKS) has been proposed, where a sender's secret is required for encryption, and trapdoor associated not only but also the sender. This setting allows us to prevent information leakage of from trapdoors. Liu et al. (ASIACCS 2022) proposed generic construction PAEKS based on word-independent smooth projective hash functions (SPHFs) PEKS. In this paper, we propose new PAEKS, which more efficient than al.'s in sense that use one SPHF, used two SPHFs. addition, consistency considered security model stronger al.'s. Briefly, keywords even though Thus, sender should work against ciphertexts generated by another sender, if same associated. That is, previous definitions, there room ciphertext be searchable was specified when generated, violates authenticity PAKES. Our definition considers multi-sender captures case. indistinguishability chosen attack (IND-CKA) inside guessing (IND-IKGA), defined Qin (ProvSec 2021), an adversary allowed query challenge oracles. We highlight several issues terms functions, e.g., their does satisfy they claimed hold.