Notes on Learning the DES Algorithm DES (Data Encryption Standard) is a classic symmetric encryption algorithm developed by IBM and adopted by the U.S. National Bureau of Standards in 1977. It uses a fixed-length 56-bit key to encrypt 64-bit data blocks, transforming plaintext into ciphertext through a series of complex permutations and substitutions. This is … Read more
RSA (Rivest-Shamir-Adleman) is a classic asymmetric encryption algorithm proposed by three cryptographers Ron Rivest, Adi Shamir, and Leonard Adleman in 1977. Its core function is to achieve secure communication through public key encryption and private key decryption, widely used in digital signatures, SSL/TLS protocols, data encryption, and other fields. Key Generation Principle of RSA Significance … Read more
1. Definition of Cryptography Before the late 20th century, cryptography was more of an art, primarily used for secret communication. At that time, there were no theories to rely on, nor any effective definitions to construct a good cipher. It wasn’t until the 1980s that the emergence of modern cryptography transformed the study of cryptography … Read more