Dynamic data sharing method, terminal device and agent server

Abstract

The invention discloses a dynamic data sharing method, a terminal device and an agent server. The dynamic data sharing method, the terminal device and the agent server are applied to the technical field of Internet information. In the method, a data owner encrypts dynamic data by using a public key thereof and uploads the encrypted data to the cloud server; the agent server generates a re-encryption key, including, the data owner and an authorized user private key, for each authorized user; each authorized user after obtaining a search keyword generates a trap door and sends the trap door to the agent server; the agent server generates a keyword label value by using the trap door and the re-encryption key and enables a cloud server to determine a corresponding dynamic data ciphertext basedon the label value, to encrypt the dynamic data ciphertext by using the re-encryption key and then to feed back the ciphertext to the authorized users; and each authorized user decrypts the dynamic data by combining with the private key thereof to obtain a corresponding dynamic data plaintext. A multi-user sharing demand for the dynamic data in a cloud storage environment is satisfied, and each authorized user can obtain the dynamic data shared in the cloud server by using the private key thereof.

Description

technical field [0001] The invention belongs to the field of Internet information technology, and in particular relates to a dynamic data sharing method, a terminal device and a proxy server. Background technique [0002] In order to ensure the security of the dynamic data stored in the cloud server, the dynamic data needs to be encrypted, and only users with the correct decryption key can obtain the dynamic data from the cloud server. In the prior art, most dynamic data in the cloud server are encrypted using a symmetric encryption algorithm, that is, the encryption key is the same as the decryption key. [0003] Using this algorithm can ensure the security of dynamic data, but it cannot meet the needs of multi-users sharing dynamic data in cloud storage environment. This is because if there are multiple authorized users who can obtain dynamic data, each authorized user can only use the same decryption key to ensure that each authorized user can obtain dynamic data from th...

AI Technical Summary

Problems solved by technology

[0003] Using this algorithm can ensure the security of dynamic data, but it cannot meet the needs of multi-users sharing dynamic data in the cloud storage environment.

This is because if there are multiple authorized users who can obtain dynamic data, each authorized user can only use the same decryption key to ensure that each authorized user can obtain dynamic data from the cloud server, which obviously cannot meet the requirements of each authorized user. The user's privacy requirements; and if each authorized user is assigned an independent decryption key, the cloud server needs to encrypt the same dynamic data with different encryption keys to obtain the dynamic data encryption corresponding to each authorized user. file to ensure that each authorized user can use their own decryption key to obtain dynamic data, but this processing method will cause a large amount of redundant data to be stored in the cloud server and increase the burden on the cloud server

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