Python implemention of the four-square cipher. Read the article on Wikipedia for an explanation of the algorithm and a reference implemention.
This package runs with no dependencies whatsoever.
import foursquare
cipher = foursquare.Cipher('DIDNT', 'READ', 'TLDR')
encode = cipher.encrypt('secretmessage')
# 'urfphqorssegix'
decode = cipher.decrypt(encode)
# 'secretmessagez'Unlike the reference implementation on Wikipedia, up to 4 keys can be provided when creating a Cipher object.
If you would like to only encode the 2nd and 3rd alphabet table, set the corresponding argument to an empty string:
cipher = foursquare.Cipher('', 'READ', 'TLDR', '')