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.