An Enhanced Searchable Public Key Encryption Scheme with a Designated Tester and Its Extensions

Abstract

In a searchable public-key encryption scheme with a designated tester (dPEKS), only the designated server can test which dPEKS ciphertext is related with a given trapdoor generated by a user with a keyword $w$ by using the server's private key, but learn nothing else. In this paper, we study the keyword guessing attack of dPEKS and shows that two dPEKS schemes are insecure against this type of attack. Then an enhanced scheme is proposed and proved secure against chosen keyword attack and keyword guessing attack. To resolve the problem that dPEKS scheme does not allow the user to decrypt the encrypted keyword which limits its applicability, we give the definition of decryptable searchable public key encryption with a designated tester which enables keyword decryption from keyword ciphertext and get a concrete construction based on our dPEKS scheme. At last, we extend the dPEKS scheme to a bidirectional searchable proxy re-encryption with a designated tester scheme(Re-dPEKS)

Research on Privacy Preserving Models for Efficient Healthcare Big Data Sharing in Cloud

“…In this paper various factors like profile aspects, token, user request were verified before providing access to data this increases the efficiency of privacy preserving. [7] proposes solution to deal with the keyword guessing attack. Keywords are shared to the users of the data.…”

A Searchable Encryption Scheme in a Multi-user Setting for Cloud Storage

“…storage of a server for n data of m users, whereas scheme [6] and schemes [13,14] [7,9,10,11] in a single-user setting and the scheme [6] in a multi-user setting, but fewer than that of schemes [20,21] in a multi-user setting.…”

Efficient public key encryption with revocable keyword search in cloud computing

“…In most of the existing PEKS schemes [5][6][7][8][9][10], upon obtaining a trapdoor information of a keyword, the server can always search on the encrypted data. And it can utilize these trapdoor information to execute keywords guessing attack.…”