Security-enhanced keyword search method based on public key encryption

Abstract

The invention discloses a security-enhanced keyword search method based on public key encryption. The invention discloses a security-enhanced keyword search system based on public key encryption, which comprises a key management mechanism, a data owner, a data visitor and a search server, and is characterized in that the key management mechanism is responsible for generating global parameters, a search server key and a data visitor key; and the search server is responsible for storing the encrypted ciphertext and the search ciphertext of the data owner, receiving the search key of the data visitor and then performing data search. By improving an existing identity encryption scheme, the anonymity of an IBE scheme is realized, a public key encryption scheme which does not need a secure channel and can realize keyword search is provided based on the IBE scheme with the anonymity, and the scheme performs security certification based on deterministic bilinear DiffieHellman hypothesis undera standard model. Finally, correctness and calculation consistency verification of a proposed scheme is given, and specific functionality and performance analysis is carried out.

Description

technical field [0001] The invention belongs to the technical field of data encryption processing, and relates to a security-enhanced keyword search method based on public key encryption. Background technique [0002] In cloud storage, log storage and mail processing systems, in order to protect stored data, most systems use encryption algorithms to encrypt and protect data. However, the encrypted data exists in the form of cipher text, and the data cannot be searched. The main technology to solve this problem is to adopt an encryption scheme for realizing keyword search. [0003] Encryption schemes that can realize keyword search can be divided into: Symmetric Encryption Scheme with Keyword Search (SEKS) and public key encryption scheme (Public Key Encryption Scheme with Keyword Search, PEKS) ). In the SEKS technical solution, the data sender and the data visitor need to share the same symmetric key, and the management and distribution of the key is very complicated and n...

AI Technical Summary

Problems solved by technology

Subsequently, several related SCF-PEKS schemes were proposed one after another, but these schemes were only proved to be safe under the random oracle model, and the random oracle model is an ideal hypothetical model, and its security needs to be further verified

Therefore, Fang et al. continued to improve the SCF-PEKS scheme, and proposed a security-enhanced SCF-PEKS scheme based on Gentry's identity based encryption scheme (IBE) in 2009, which was proved under the standard model is safe, however, the scheme is based on the complex security assumption of Decisional q-Augmented Bilinear Diffie-Hellman Exponent (q-ABDHE), and q-ABDHE is a strong assumption, and its security is still questioned

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