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In this paper we introduce Password Authenticated Keyword Search (PAKS), a cryptographic scheme where any user can use a single human-memorizable password to outsource encrypted data with associated keywords to a group of servers and later retrieve this data through the encrypted keyword search procedure. PAKS ensures that only the legitimate user who knows the initially registered password can perform...
In public key encryption with keyword search (PEKS) framework, see Figure 1(a), the cloud server stores index Iw and verifies the equivalence whether w = w′ or not on receiving a keyword search request through a trapdoor Tw′. Aside from the traditional secrecy concerns over index, a new threat called inner keyword guessing attack which addressed the secrecy of trapdoors against off-line brute force...
A commutative encryption is a kind of an encryption system that enables a plaintext to be encrypted more than once using different users' public keys. In this system, decryption is not required before the encryption/re-encryption processes. Moreover, the resulted ciphertext can be decrypted by the designated decrypters without considering the order of public keys used in the encryption/re-encryption...
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