Key schedule

The key schedule of DES ("<<<" denotes a left rotation)

In cryptography, the so-called product ciphers are a certain kind of ciphers, where the decryption of data is done in "rounds". The general setup of each round is the same, except for some hard-coded parameters and a part of the cipher key, called a subkey. A key schedule is an algorithm that, given the key, calculates the subkeys for these rounds.


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