And 3des - Des

The inverse of the initial permutation to produce the final ciphertext. 2. Triple DES (3DES)

This guide covers the and its more secure successor, Triple DES (3DES) . Both are symmetric-key block ciphers that encrypt data in 64-bit blocks. 1. Data Encryption Standard (DES) DES and 3DES

Rearranges the 64 bits of the input block. The inverse of the initial permutation to produce

Uses a Feistel network consisting of 16 rounds of processing. XOR with a subkey

Developed in the 1970s, DES was the global standard for decades before its 56-bit key became vulnerable to modern brute-force attacks.

Each of the 16 rounds involves expansion, XOR with a subkey, substitution (via S-boxes), and permutation.