Privacy-protected identity-based encryption method and system with keyword search

Abstract

The invention discloses a privacy-protected identity-based encryption method with keyword search. The method comprises the steps of generating public parameters and a main private key of a system, generating a private key of an entity, generating a keyword ciphertext, generating a keyword trap door and testing. The invention also discloses a privacyprotected identity-based encryption system with keyword search. The system comprises a system parameter generation module, a key generation module, a keyword ciphertext generation module, a keyword trap door generation module and a test module. According to the technical scheme, a ciphertext search function for privacy protection is provided, keyword guessing attacks based on an identity encryption method for existing keyword search can be effectively resisted, and the purpose of protecting user privacy is achieved.

Description

technical field [0001] The invention relates to the technical field of data encryption in information security, in particular to an identity-based encryption method and system with keyword search for privacy protection. Background technique [0002] The encryption technology with keyword search allows users to search whether the data ciphertext contains specific keywords without revealing the relevant plaintext and keyword information, which provides an effective and safe solution to the problem of ciphertext retrieval. This new encryption system is divided into two types: symmetric encryption with keyword search and asymmetric encryption with keyword search (that is, public key encryption with keyword search). Symmetric encryption with keyword search uses the same key to generate keyword ciphertext and trapdoor. The advantage is high efficiency, but there is a problem of key distribution. Public key encryption with keyword search uses different keys to generate keyword cip...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a privacy-protected identity-based encryption method and system with keyword search. The privacy-protected identity-based encryption method with keyword search proposed by the present invention It not only overcomes the problem of keyword guessing attacks, but also provides a privacy-protected ciphertext search function, and benefits from the excellent characteristics of the identity-based cryptographic system, and there is no complicated certificate management problem

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