The inverse of the initial permutation to produce the final ciphertext. 2. Triple DES (3DES)
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. 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. The inverse of the initial permutation to produce
Uses a Feistel network consisting of 16 rounds of processing. DES and 3DES
Rearranges the 64 bits of the input block.
56-bit effective key length (plus 8 parity bits for a total of 64 bits). Block Size: 64 bits. Process Steps:
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