A method for preventing injection attack of data encryption standard coprocessor

Abstract

The embodiment of the invention relates to an injection attack prevention method for a data encryption standard coprocessor, and the method is characterized in that the method comprises the steps: obtaining a first plaintext and a first secret key, and storing the first plaintext and the first secret key; backing up the first secret key and generating a second secret key; performing first anti-injection verification on the first plaintext and the first key; performing encryption operation according to the first plaintext and the first key to generate a second ciphertext; performing decryptionoperation according to the second ciphertext to generate a third plaintext; performing second anti-injection verification on the third plaintext; performing third anti-injection verification accordingto the first secret key and the second secret key; performing fourth anti-injection verification according to the encrypted path state word; and after the fourth anti-injection verification succeeds,outputting the second ciphertext as a calculation result. According to the method, through four times of anti-injection verification, whether the data used in the calculation process is subjected tothe injection type attack or not can be verified, so that the prevention capability of the data encryption standard coprocessor on the injection type attack is improved.

Description

technical field [0001] The invention relates to the technical field of single-chip microcomputers, in particular to a data encryption standard coprocessor anti-injection attack method. Background technique [0002] Data Encryption Standard (Data Encryption Standard, abbreviation: DES) coprocessor has been widely used in secure computing single-chip microcomputers, and is mainly used to improve the ability of data encryption of single-chip microcomputers. The purpose of the injection attack on the coprocessor is to destroy the data encryption function of the single-chip microcomputer to which it belongs, and cause the upper-layer application execution error of the single-chip microcomputer. The existing injection attack methods have the following aspects: the injection attack on encrypted data disrupts the encryption result by destroying the data to be encrypted; the injection attack on the encryption key disrupts its encryption by destroying the encryption key. The purpose ...

AI Technical Summary

Problems solved by technology

The purpose of the injection attack on the coprocessor is to destroy the data encryption function of the single-chip microcomputer to which it belongs, and cause the upper-layer application execution error of the single-chip microcomputer

Images