Soft analysis side channel attack method for block cipher in post quantum cryptography

• Main Authors: LYU QINGZHE, SHI JIAN, LI ZHONGKUI, FANG KAIJUN, WU XIAO
• Format: Patent
• Language: Chinese; English
• Published: 07.06.2024
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention relates to the technical field of cryptography, and belongs to a soft analysis side channel attack method for a block cipher in post quantum cryptography, which comprises a construction module, an information extraction module and a decoding module, and is characterized by comprising the following steps: S1, constructing a formation factor graph for an intermediate variable of a block cipher algorithm Ascon in the construction module; s2, repeatedly collecting side channel information for multiple times in the information extraction module and outputting the side channel information; s3, establishing a template for the information collected in the S2; s4, matching the template obtained in the step S3 with the factor graph information (actually operated side channel information) obtained in the step S1 to obtain probability distribution of possible values of intermediate variables, and outputting the probability distribution of the possible values of the intermediate variables; and S5, decoding t