A cryptographic device and its data encryption and decryption method

Abstract

The invention discloses a cryptographic device and a data encryption and decryption method thereof, belonging to the technical field of information security. The method includes: the main control processor of the cryptographic device receives the cryptographic service instruction sent by the mobile terminal, the cryptographic service instruction includes a cryptographic algorithm identification, the cryptographic device is a hardware cryptographic device and is installed in the mobile terminal; when the memory of the algorithm coprocessor of the cryptographic device When the target code of the cryptographic algorithm is stored in and the cryptographic algorithm identification of the target code of the cryptographic algorithm is not the cryptographic algorithm identification included in the cryptographic service instruction, the password indicated by the cryptographic algorithm identification included in the cryptographic service instruction is extracted from the external memory of the cryptographic device The target code of the algorithm, and the target code of the extracted cryptographic algorithm is loaded into the memory, and the target codes of at least two sets of cryptographic algorithms are stored in the external memory; the control algorithm coprocessor processes the data to be decrypted through the target code of the cryptographic algorithm in the memory. Decrypt or encrypt data to be encrypted.

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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