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I am not asking for C code for the algorithm, i am just asking for an explanation in terms of C. . For example if the user enters the plaintext (64-bit), how am i supposed to know which are the...

I learned the bitwise operations in c, but i still cann't figure out how to shuffle the bits of the plain text accoring to DES's standard. Even with the key and the S-boxes. If someone could explain...