Cipher device and data encryption and decryption method thereof

Abstract

The invention discloses a cipher device and a data encryption and decryption method thereof, and belongs to the technical field of information security. The method comprises the following steps: receiving, by a main control processor of the cipher device, a cipher service instruction sent by a mobile terminal, wherein the cipher service instruction comprises a cipher algorithm identifier, the cipher device is a hardware cipher device and is installed in the mobile terminal; when a target code of a cipher algorithm is stored in an internal memory of an algorithm coprocessor of the cipher deviceand the cipher algorithm identifier of the target code of the cipher algorithm is not the cipher algorithm identifier contained in the cipher service instruction, extracting the target code of the cipher algorithm indicated by the cipher algorithm identifier contained in the cipher service instruction from an external memory of the cipher device, and loading the extracted target code of the cipher algorithm to the internal memory, wherein the target codes of at least two cipher algorithms are stored in the external memory; and controlling the algorithm coprocessor to decrypt to-be-decrypted data or encrypt to-be-encrypted data via the target code of the cipher algorithm in the internal memory.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a cryptographic device and a data encryption and decryption method thereof. Background technique [0002] In the process of using mobile terminals for communication, there is a risk of leakage of user personal identity information, voice, image, and video data. In order to provide communication security, a cryptographic device (also called an encryption device) is built into the mobile terminal. A cryptographic device is a security tool used to realize basic cryptographic operations of data encryption and decryption through cryptographic algorithms. Common cryptographic devices include hardware cryptographic devices. [0003] The hardware encryption device adopts a specific hardware circuit or a dedicated encryption chip to realize data encryption and decryption. The data encryption and decryption method flow provided by a conventional hardware cryptographic devic...

AI Technical Summary

Problems solved by technology

[0005] Conventional hardware encryption devices only provide one encryption algorithm for data encryption and decryption, and mobile terminals are suitable for application scenarios that require encryption and decryption of one encryption algorithm, but few application scenarios require encryption and decryption of one encryption algorithm, which limits the application of mobile terminals to more scenes

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