The invention discloses a ciphertext data set intersection calculation method, a device, a system, a client, a server and a medium, and the method comprises the steps: encrypting a plaintext data setaccording to a public key of a user, obtaining a ciphertext data set, and transmitting the ciphertext data set to the server; generating authorization information of the authorization level accordingto the authorization level selected by the user; sending the authorization information to a server, sending the ciphertext data set and the authorization information to a server, so that the server performs calculation according to the ciphertext data set and the authorization information to obtain an intermediate value set, performing intersection calculation on the ciphertext data sets of the two users according to the intermediate value set of the two users conforming to the authorization level to generate a ciphertext data set intersection, and sending the ciphertext data set intersectionto clients of the corresponding users; receiving a ciphertext data set intersection sent by the server; and decrypting the ciphertext data set intersection according to the ciphertext data set intersection and the private key input by the user to obtain a plaintext data set intersection. On the premise of ensuring the safety, the flexibility is remarkably improved.

Ciphertext data set intersection calculation method, device, system, client, server and medium

The invention provides a method for supporting synchronization ciphertext comparison of a backup server, and the method comprises the steps that a TA (trusted authority) selects a security parameter and an anti-collision hash function to generate a public parameter; each user generates a respective public key and a respective private key, where the users include data decryptors; a main server anda backup server generate respective public and private keys; a data encryptor performs an encryption algorithm by using the public keys of two data decryptors, and a generated ciphertext is sent to the two servers; the data decryptor downloads the corresponding ciphertext from any one server, and then uses the private key to decrypt the ciphertext; the data decryptor generates an authorization token ctk, and at the same time authorizes the main server and the backup server to perform equivalent comparison of the ciphertext; the two servers perform the decryption of the received authorization token ctk to obtain an authorization token tk; the two servers use the authorization token tk to perform the comparison of the stored user ciphertext data to determine whether the compared user ciphertexts contain the same plaintext message through encryption or not.

Method for supporting synchronization ciphertext comparison of backup server

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Method for supporting synchronization ciphertext comparison of backup server