A fully homomorphic encrypted ciphertext query method and system

Abstract

Disclosed is a fully homomorphic encryption-based ciphertext query method, comprising the following steps: obtaining a plaintext of any data type, encrypting the plaintext, and performing ciphertext storage by using the result obtained after the encryption as a queried object; receiving the plaintext as a query condition, encrypting the plaintext, storing the result obtained after the encryption by using the result as a query object; performing system ciphertext bit summing on the obtained queried object and query object, decrypting the summing result as the ciphertext query result into a plaintext, and comparing the obtained plaintext with the plaintext as the query condition; if the plaintexts are the same, indicating that the ciphertext query result is correct; otherwise, indicating that the ciphertext query result is wrong. The present invention can resolve the technical problem of sensitive information leakage because whether queried content is true can be known without decryption since the ciphertexts encrypted using the same key are always the same in the existing ciphertext query method based on a symmetric cryptographic algorithm.

Description

technical field [0001] The invention belongs to the field of information security, and more specifically relates to a fully homomorphic encrypted ciphertext query method and system. Background technique [0002] Ciphertext query has been widely used in the technical field of full-text retrieval at present, and is used to obtain the retrieval result of keyword query. [0003] Currently widely used ciphertext query methods mainly use symmetric cipher algorithms and asymmetric cipher algorithms. In symmetric cipher algorithms, since block cipher algorithms use the same key, the ciphertext encrypted by the same content is always the same. Therefore, You can know whether the queried content is true without decryption, so there is a problem of sensitive information leakage; for asymmetric encryption algorithms, once the plaintext data is encrypted, if you want to query the ciphertext content, you must first ciphertext Decryption, and then plaintext comparison to get the query res...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a fully homomorphic encrypted ciphertext query method and system, the purpose of which is to solve the problem that the existing ciphertext query methods based on symmetric cryptographic algorithms use the same key to encrypt the same ciphertext, so there is no need to decrypt It is possible to know whether the queried content is true, so there is a technical problem of sensitive information leakage, and the ciphertext query method based on asymmetric cryptographic algorithm may leak data during the query process, so there is a technical problem of sensitive information leakage

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