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DES query Experts reply





akshar
How come the s boxes of DES are lossless? How can we get back the row and column values from the output of s boxes while decryption.

If you know S-DES, the each S-box takes 4 bits as input and gives out 2 bits as output so while decryption how the hell we get 4 bits from two bits. Please explain in detail or provide links
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