A method of cracking sm4 algorithm

Abstract

The invention discloses an implementation method for breaking an SM4 algorithm. The method comprises the steps of generating a plurality of plaintexts and encrypting each plaintext via a composite field S box with a mask measure; using a fault clock to successively attack the first output of each S single box of the S box during the encrypting process of each plaintext, and thus obtaining the plaintext corresponding to the zero input of each single box of the S box; and backstepping according to the plaintext corresponding to the zero input of each single box to acquire an S box encrypted key. The method can break the encrypted key of the SM4 algorithm.

Description

technical field [0001] The invention belongs to the technical field of information deciphering, and in particular relates to a method for deciphering the SM4 algorithm. Background technique [0002] As an important cryptographic algorithm carrier, smart cards are widely used in people's daily life. The attack technology research on cryptographic chips mainly includes intrusive attack technology, semi-intrusive attack technology and non-intrusive attack technology. Among them, the non-intrusive attack technology has become the most popular technology nowadays because of its simple implementation, low cost and no damage to the chip. The main threat to cryptographic chips. Fault attack is a commonly used non-intrusive attack technology, which uses a cryptographic chip to suddenly change the working environment of the chip (such as frequency or voltage) during the operation process, resulting in an error in the encryption operation and obtaining the wrong ciphertext. The diffe...

Images