terminology

• Information Technology exam
• Data Encryption Standard (DES) is a symmetric key algorithm used for encryption and decryption of data
• DES operates on 64-bit blocks of plaintext and uses a 56-bit key for encryption
• The key generation process involves creating 16 subkeys, each 48 bits long, from the original 56-bit key
• DES uses a Feistel network structure with 16 rounds of encryption and decryption
• Each round of DES involves permutation, substitution, and key mixing operations
• The Data Encryption Algorithm (DEA) is a variant of DES that uses a 128-bit key for stronger encryption
• Triple DES (3DES) is a method that applies the DES algorithm three times to each data block for enhanced security
• Advanced Encryption Standard (AES) is a symmetric key algorithm that replaced DES as the standard encryption algorithm
• AES supports key sizes of 128, 192, or 256 bits for encryption
• AES operates on 128-bit blocks of plaintext and uses a substitution-permutation network structure