cryptology
1 is a technical science that studies cryptography and decoding. Studying the objective law of password change and applying it to compiling passwords to keep communication secrets is called coding; The act of obtaining communication information by deciphering passwords is called deciphering and cryptography.
2. The main purpose of cryptography is to hide the meaning of information, not the existence of information. Cryptography also promotes computer science, especially technologies used in computer and network security, such as access control and information confidentiality.
3. Cryptography has been applied in daily life, including ATM chip cards, computer users' access passwords, e-commerce and so on.
4. Password is an important secret means for communication parties to convert special information according to agreed rules. According to these laws, changing plaintext into ciphertext is called encryption transformation; Turning ciphertext into plaintext is called decryption transformation.
In the early days, passwords only changed the encryption and decryption of characters or numbers. With the development of communication technology, voice, image and data can be encrypted and decrypted.
6. Using the laws of characters and passwords, under certain conditions, we can get plaintext by analyzing the intercepted ciphertext, and we can restore the password, that is, we can decipher the password. Deciphering passwords with different strengths requires different conditions, even very different.