[UTCTF2020]babymips 题解

data=[0x52, 0xFD, 0x16, 0xA4, 0x89, 0xBD, 0x92, 0x80, 0x13, 0x41,
  0x54, 0xA0, 0x8D, 0x45, 0x18, 0x81, 0xDE, 0xFC, 0x95, 0xF0,
  0x16, 0x79, 0x1A, 0x15, 0x5B, 0x75, 0x1F]
print("flag{",end='')
for i in range(len(data)):
    if i%2==0:
        data[i]=(data[i]&0x3f)<<2|(data[i]&0xc0)>>6
        print(chr(data[i]^0x20-i-5),end="")
    else:
        data[i]=(data[i]&0xfc)>>2|(data[i]&0x3)<<6
        print(chr(data[i]^0x20-i-5), end="")