1, extended data cryptography and cryptanalysis are two opposite branches. Modern cryptography studies the secure transmission and storage of information from the initiator to the receiver, which is a science of "knowing yourself and knowing yourself". Its core is cryptography and cryptanalysis.

2. Cryptography and cryptanalysis. According to Sohu. Com, the cryptographic system is at least composed of plaintext, ciphertext and encryption algorithm, including cryptography and cryptanalysis. Cryptography mainly studies secure cryptographic algorithms and protocols to realize information encryption protection or message authentication.

3. Cryptography mainly includes two branches: cryptography and cryptanalysis. The main purpose of cryptography is to find ways to ensure information confidentiality or kernel shaping, and the main purpose of cryptanalysis is to study the decoding of encrypted messages or the forgery of messages. Cryptography has experienced the evolution from ancient cryptography to modern cryptography.

4. Cryptography is divided into coding and cryptanalysis. Cryptography mainly studies the coding of information and realizes the concealment of information. Cryptanalysis mainly studies the decoding of encrypted messages or the forgery of messages. They are independent and interdependent, developing in the struggle of contradictions and in the unity of opposites.