How to Strengthen DES Using Existing Hardware

@inproceedings{Biham1994HowTS,
  title={How to Strengthen DES Using Existing Hardware},
  author={Eli Biham and Alex Biryukov},
  booktitle={ASIACRYPT},
  year={1994}
}
requires more than trillion years on Wiener's machine 20]. Its main advantage is that organizations can increase the security of their systems which use DES in hardware, with the same encryption/decryption speed. An additional advantage is the backward compatibility to the standard DES, that can be achieved by choosing K a = K b = 0 and K c which does not modify the order of the S-boxes. Table 6 compares the security of the variants of our scheme and the standard DES. 
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Long Key Variants of DES

CRYPTO • 1982
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