ciphers.bifid¶

The Bifid Cipher uses a Polybius Square to encipher a message in a way that makes it fairly difficult to decipher without knowing the secret.

Attributes¶

class ciphers.bifid.BifidCipher¶

decode(message: str) → str¶

Return the decoded version of message according to the polybius cipher

>>> BifidCipher().decode('qtltbdxrxlk') == 'testmessage'
True

encode(message: str) → str¶

Return the encoded version of message according to the polybius cipher

>>> BifidCipher().encode('testmessage') == 'qtltbdxrxlk'
True

>>> BifidCipher().encode('Test Message') == 'qtltbdxrxlk'
True

>>> BifidCipher().encode('test j') == BifidCipher().encode('test i')
True

letter_to_numbers(letter: str) → numpy.ndarray¶

Return the pair of numbers that represents the given letter in the polybius square

>>> np.array_equal(BifidCipher().letter_to_numbers('a'), [1,1])
True

>>> np.array_equal(BifidCipher().letter_to_numbers('u'), [4,5])
True

numbers_to_letter(index1: int, index2: int) → str¶

Return the letter corresponding to the position [index1, index2] in the polybius square

>>> BifidCipher().numbers_to_letter(4, 5) == "u"
True

>>> BifidCipher().numbers_to_letter(1, 1) == "a"
True

ciphers.bifid.SQUARE = [['a', 'b', 'c', 'd', 'e'], ['f', 'g', 'h', 'i', 'k'], ['l', 'm', 'n', 'o', 'p'], ['q', 'r',...¶