Cryptography help? DES systems

Discussion in 'Programming/Html' started by evilkelvin, Oct 1, 2010.

  1. evilkelvin

    evilkelvin Master Guru

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    GPU:
    ATI 5870 XFX BLACK
    The following key information and right hand side R2 are input into the DES round function F in the third round of the algorithm.
    C2 = 11111100 00001111 11000000 1111, D2 = 11111100 00001111 11000000 1111
    R2 = 11000110 00110000 00110000 00011100. Use this to calculate K3 and the result of the function F(R2, K3).


    I have looked up various guides on the internet to do this question for uni, yet, I still don't understand it!!! Anyone here have any clue how to do this one? Its all about DES cryptosystems.
     

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