SM4 (SMS4) Block Cipher Algorithm | ShangMi Block Cipher | Cryptography and network security

In this video, we will delve into the SM4 Block Cipher Algorithm, a widely adopted symmetric encryption standard in modern cryptographic systems. Developed by the Chinese Academy of Sciences, SM4 is known for its simplicity, security, and efficient implementation. We'll explore its core principles, design features, and cryptographic properties. - Introduction to the SM4 Block Cipher Algorithm - Historical Background and Development - Key Features of SM4 - Block Size and Key Length - SM4 Encryption Process Overview - Substitution-Permutation Network (SPN) Structure - Detailed Explanation of the SM4 Round Function - Key Expansion Process - Encryption and Decryption Flow - ShāngMì 4 (SM4, 商密4) SM4 is a symmetric key block cipher used for the encryption and decryption of data. It is a part of the Chinese National Standard for Cryptographic Algorithms, GB/T 32907-2016, which was issued by the State Cryptography Administration (SCA) of China. Also known as SMS4, SM4 is designed to provide a high level of security and efficiency for various cryptographic applications. It is widely used in China for secure data communication, electronic commerce, and other security-related scenarios. Key features of the SM4 block cipher include: Block Size: SM4 operates on 128-bit blocks of data. Key Size: The key length can be either 128 bits or 256 bits. Number of Rounds: SM4 employs 32 rounds for encryption and decryption. Feistel Structure: The cipher uses a Feistel network structure, which is a symmetric structure that iterates through multiple rounds, providing diffusion and confusion. Substitution-Permutation Network (SPN): Within each round, a combination of substitution and permutation operations are performed on the data. S-box: SM4 uses a fixed 8-bit S-box to provide confusion during encryption and decryption. Key Expansion: SM4 employs a key expansion algorithm to generate round keys from the original encryption key. The SM4 algorithm has undergone extensive security analysis and has been considered secure against various attacks. Its adoption in various Chinese standards and protocols ensures secure and standardized cryptographic implementations within China's information security systems. However, as with any cryptographic algorithm, its security also depends on the proper use of keys and good cryptographic practices. The Chinese Cipher ShāngMì 4 (SM4, 商密4) Explained SM4 Algorithm SM4 algorithm in Cryptography SMS4 Algorithm SM4 encryption algorithm in Cryptography SM4 algorithm in Cryptography and network security SM4 encryption algorithm SM4 encryption SM4 decryption SM4 full form with an explanation Advanced encryption standard algo Cryptography and network security