Below is a 3-round keyed Feistel cipher. F((k1,k2,k3),x1x2):x3=F(k1,x2)x1x4=F(k2,x3)x2x5=F(k3,x4)x3returnx4x5 Write the corresponding inverse: F1((k1,k2,k3),x4x5):??? Don't worry about making it look pretty. You can type k1, k2 instead of k1,k2 etc, and you can use "+" for XOR. Edit Insert