Each of the 16 rounds involves expansion, XOR with a subkey, substitution (via S-boxes), and permutation.
3DES was introduced to extend the life of DES by applying the algorithm three times to each data block, significantly increasing the effective key length to combat brute-force attacks.
Uses a Feistel network consisting of 16 rounds of processing. DES and 3DES
Developed in the 1970s, DES was the global standard for decades before its 56-bit key became vulnerable to modern brute-force attacks.
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) Each of the 16 rounds involves expansion, XOR
56-bit effective key length (plus 8 parity bits for a total of 64 bits). Block Size: 64 bits. Process Steps:
Rearranges the 64 bits of the input block. Developed in the 1970s, DES was the global
The inverse of the initial permutation to produce the final ciphertext. 2. Triple DES (3DES)
