Vulnerability retrieval method based on homomorphic encryption and casual transmission

The invention discloses a vulnerability retrieval method based on homomorphic encryption and careless transmission, and belongs to the technical field of information security. The method comprises the steps that after vulnerability library data is preprocessed and system parameters are initialized, a server and a user share a secret key through a digital signcryption algorithm based on SLS, the secret key serves as a secret key of an AES encryption algorithm to protect transmission of a software name, and ciphertext query of the software name is achieved; a user generates a corresponding public key and a private key according to a homomorphic encryption algorithm and sends the public key and a version number subjected to homomorphic encryption to a server, and the server ensures the privacy of a version range through homomorphic encryption and linear transformation and realizes ciphertext query of the software version range; and the server and the user find the matched index number according to the joint quer