Data Encryption Standard (DES) | Cryptography

🔐 Data Encryption Standard (DES) | Complete Explanation In this video, we explain the DES algorithm step by step, covering everything you need to know: - Key Expansion (Key Scheduling) – how the original 64-bit key is reduced, shifted, and transformed into 16 subkeys. - Encryption Process – initial permutation, splitting into left and right halves, 16 Feistel rounds (expansion, XOR, S-box substitution, permutation), and the final permutation to produce ciphertext. - Decryption Process – using the same Feistel structure as encryption but applying the round keys in reverse order