A multi-receiver ciphertext searchable identity-based encryption method

Abstract

The invention discloses an identity-based encryption method and system with searchable multi-receiver ciphertexts. The method includes generating global public parameters and master keys of the system, generating private keys of entities, generating index ciphertexts, and generating search traps. Steps for gate and match testing. The invention also provides an identity-based encryption system with multi-recipient ciphertext searchable, including a system initialization module, an entity private key generation module, an index ciphertext generation module, a search trapdoor generation module and a matching test module. The technical scheme of the invention can not only support the function of multi-receiver ciphertext search, reduce the cost of communication and calculation, but also effectively resist keyword guessing attacks aimed at search trapdoors, and achieve the purpose of protecting the privacy of recipients.

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 with multi-recipient ciphertext searchable. Background technique [0002] In order to solve the problem of encrypted data retrieval, Song et al. proposed the technology of searchable encryption in 2000. This new type of encryption technology overcomes the defect that the traditional encryption technology cannot directly retrieve the ciphertext, and quickly attracts the attention and research of the field of cryptography. However, the searchable encryption proposed by Song et al. is based on a symmetric cryptosystem, so there are key management and key distribution problems. In 2004, Boneh et al. proposed a searchable public key encryption method for the first time. This method enables the user to authorize the untrustworthy ciphertext storage server to detect whether the ciphertext sent to him and encrypted wit...

AI Technical Summary

Problems solved by technology

Obviously, this has a high computational and communication cost

Second, vulnerable to keyword guessing attacks

Existing methods use the receiver's identity to encrypt keywords to generate index ciphertexts, which enables attackers to generate index ciphertexts of keywords they guess and expose keyword information in any given search trapdoor through matching testing algorithms, resulting in Leakage of the recipient's search information, damaging the recipient's privacy

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