Defense reverse engineering encryption method based on Camellia algorithm

Abstract

The invention discloses a defense reverse engineering encryption method based on a Camellia algorithm. A confused finite state machine is built and then loaded into the Camellia algorithm, then an authorization key which is the same as a 4-bit binary authorization key set in the confused finite state machine is input into the Camellia algorithm, so that the confused finite state machine in the Camellia algorithm outputs a 64-bit binary number Ot, and three times of iterative encryption operations are performed on to-be-encrypted data of a to-be-encrypted circuit on the basis of the 64-bit binary number Ot to obtain encrypted data. The defense reverse engineering encryption method based on the Camellia algorithm provided by the invention has the advantages that when an attacker extracts encrypted data in the circuit through reverse engineering, since the attacker does not know the correct authorization key and the 64-bit binary number Ot corresponding to the correct authorization key, errors in the decryption process can be caused, and therefore incorrect data can be decrypted, so that attacks such as reverse engineering can be effectively prevented, and the protection strength of the hardware intellectual property is improved.

Description

technical field [0001] The invention relates to an encryption method based on the Camellia algorithm, in particular to a defense reverse engineering encryption method based on the Camellia algorithm. Background technique [0002] With the development of VLSI and information technology, software / hardware systems have been widely used, which greatly facilitates people's lives and also brings legitimate economic benefits to designers, but incidents of intellectual property theft occur from time to time. Among many protection technologies, security obfuscation is one of the effective ways to protect intellectual property rights. The concept of obfuscation was first proposed in the field of software code obfuscation, and has practical applications in software protection, digital watermarking and other fields. Code obfuscation uses the logic of the program itself to protect internal important information and key algorithms, ensuring that the interests of system developers and use...