A Method of Preventing Injection Attacks for Coprocessors of Public Key Cryptography Algorithms

Abstract

The embodiment of the present invention relates to a method for preventing an injection attack of a coprocessor of a public key cryptographic algorithm, wherein the method includes: initializing the encryption and decryption path status word, and obtaining the calculation type; when the calculation type is an encryption type, Obtain the first plaintext and the first and second public key parameters and perform the first verification. After the verification is successful, encrypt the first plaintext; when the calculation type is the decryption type, obtain the first ciphertext and the first, second, and Three, four, five private key parameters, the second verification is performed on the first and second private key parameters, and the third verification is performed on the third and fourth private key parameters according to the first and second private key parameters after the verification is successful. After the verification is successful, the fourth verification is performed on the first ciphertext according to the first ciphertext, the first and the second private key parameters, and the first ciphertext is decrypted after the verification is successful. The method provided by the invention completes the prevention of injection attacks through the anti-injection verification of encryption and decryption parameters.

Description

technical field [0001] The invention relates to the technical field of single-chip microcomputers, in particular to a method for preventing injection attack of a public key cryptographic algorithm coprocessor. Background technique [0002] The public key cryptography algorithm is an asymmetric algorithm, that is, encryption and decryption do not use the same key to complete: the encryption of the plaintext is completed using the public key, and the decryption of the ciphertext is completed using the private key. The existing public key cryptographic algorithm is an algorithm (abbreviated as RSA) named after the last names of the three inventors Rivest-Shamir-Adleman. As a public key cryptographic algorithm coprocessor, the RSA algorithm coprocessor has been widely used in secure computing single-chip computers, mainly used to improve the data encryption and decryption capabilities of single-chip computers. Due to the characteristics of the algorithm itself, the RSA algorith...

AI Technical Summary

Problems solved by technology

Injection attacks take advantage of this, and use injection methods to destroy various calculation parameters in a targeted manner, resulting in the exhaustion of coprocessor resources and abnormal occurrences.

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