EASYHOOK XCTF 4th-WHCTF-2017 1 data=[ 0x61, 0x6A, 0x79, 0x67, 0x6B, 0x46, 0x6D, 0x2E, 0x7F, 0x5F, 2 0x7E, 0x2D, 0x53, 0x56, 0x7B, 0x38, 0x6D, 0x4C, 0x6E, 0x00] 3 data[18]^=0x13 4 for i in range(17,-1,-1): 5 t=i^data[i] 6 if i%2: 7 data[i]=t+i 8 else:…