base64加密

常见的特征：

移位，而且很多，而且移动的位数还不一样

能够找到一个 base64 表（可能会魔改）

http://web.chacuo.net/netbasex

import base64  
  
STANDARD_ALPHABET = b'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'  
CUSTOM_ALPHABET = b'ZYXABCDEFGHIJKLMNOPQRSTUVWzyxabcdefghijklmnopqrstuvw0123456789+/'  
ENCODE_TRANS = bytes.maketrans(STANDARD_ALPHABET, CUSTOM_ALPHABET)  
DECODE_TRANS = bytes.maketrans(CUSTOM_ALPHABET, STANDARD_ALPHABET)  
  
def encode(input):  
  return base64.b64encode(input).translate(ENCODE_TRANS)  
  
def decode(input):  
  return base64.b64decode(input.translate(DECODE_TRANS))  
 
print(decode("x2dtJEOmyjacxDemx2eczT5cVS9fVUGvWTuZWjuexjRqy24rV29q"))