Initialization method and device of ZUC-256 stream cryptographic algorithm and communication method

• Main Authors: JIAO LIN, ZHANG BIN, WU WENLING, WANG YANFENG, XU CHAO, FENG DENGGUO
• Format: Patent
• Language: Chinese; English
• Published: 12.07.2019
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention discloses an initialization method and device of ZUC-256 stream cryptographic algorithm and communication method. The method comprises the following steps: 1) dividing an input 256-bit initial secret key into 32 bytes, and dividing an input 184-bit initial vector into 25 bit strings; wherein an input constant is divided into 15 7-bit constants; 2) setting a linear shift register containing 16 31-bit units and a finite state automaton containing 2 32-bit memory units R1 and R2, taking the 32 bytes, 25 bit strings and 15 7-bit constants as input parameters, sequentially loading each register unit, and clearing R1 and R2; and 3) after the first 32 rounds of iterative processes of feedback value iteration and last 1 round of iteration without feedback value iteration, forming theworking state of the ZUC-256 stream cryptographic algorithm. The method is high in compatibility with an initialization method of the ZUC-128 stream cryptographic algorithm, and safety requirements under new conditions are m