Method and device for generating replacement table

• Main Authors: HU BOLIANG, ZHANG YU'AN, AN XIAOJIANG
• Format: Patent
• Language: Chinese; English
• Published: 14.03.2023
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention discloses a method and a device for generating a permutation table. The method comprises the following steps: acquiring an initial permutation table and a key; determining N key control words according to the key, wherein N is an integer greater than 1; m elements of the initial permutation table are permuted according to the N key control words, a permuted permutation table is obtained, the permuted permutation table comprises the M elements and is used for cryptographic operation, and M is an integer smaller than or equal to N and larger than 1. According to the method, the replacement table corresponding to the key can be generated according to the key derivation result. 本申请公开了一种生成置换表的方法及装置，该方法包括：获取初始置换表和密钥；根据密钥确定N个密钥控制字，N为大于1的整数；根据N个密钥控制字将初始置换表的M个元素进行置换，获得置换后的置换表，置换后的置换表包括M个元素，置换后的置换表用于密码运算，M为小于或等于N且大于1的整数。该方法能够根据对密钥派生的结果生成所述密钥对应的一个置换表。