DATA ENCRYPTION AND DECRYPTION METHOD, DEVICE AND COMMUNICATIONS SYSTEM

摘要

A data encryption and decryption method, a device and a communications system are disclosed. The data encryption method includes: dividing the data into at least two data segments; encrypting said data segments in parallel to get the cipher text of the data; performing parallel calculating for each data segment by linear algorithm to get the Message Authentication Code (MAC); getting the encrypted data according to the cipher text and the MAC. The data decryption method includes: dividing the data to be authenticated into segments to get the cipher text segments and the MAC; performing parallel decryption for each cipher text segment to get the decrypted text and decrypted text segments; performing parallel calculating for each decrypted text segment by linear algorithm to get the check code; judging whether the data to be authenticated is correct or not according to the check code and the MAC.