1. Let F:{0,1}{0,1}{0,1} be a pseudorandom function. For all SK {0,1}n and for all input x{0,1}n, define FSK(x):=FSK(x)FSK((x+1)mod2n). Is F a pseudorandom function? If yes, prove it; if not, show an attack. 1. Let F:{0,1}{0,1}{0,1} be a pseudorandom function. For all SK {0,1}n and for all input x{0,1}n, define FSK(x):=FSK(x)FSK((x+1)mod2n). Is F a pseudorandom function? If yes, prove it; if not, show an attack