'abcdefghijklmnopqrstuvwxyz'
"""
return ''.join([''.join(l)
- for l in zip_longest(*split_text, fillvalue='')])
+ for l in zip_longest(*split_text, fillvalue='')])
def chunks(text, n, fillvalue=None):
"""Split a text into chunks of n characters
def untranspose(items, transposition):
"""Undoes a transpose
-
+
>>> untranspose(['a', 'b', 'c', 'd'], [0,1,2,3])
['a', 'b', 'c', 'd']
>>> untranspose(['d', 'b', 'c', 'a'], [3,1,2,0])
return caesar_encipher(message, -shift)
def affine_encipher_letter(accented_letter, multiplier=1, adder=0,
- one_based=True):
+ one_based=True):
"""Encipher a letter, given a multiplier and adder
>>> ''.join([affine_encipher_letter(l, 3, 5, True) \
for l in string.ascii_uppercase])
if one_based: cipher_number += 1
plaintext_number = (
modular_division_table[multiplier]
- [(cipher_number - adder) % 26] )
+ [(cipher_number - adder) % 26]
+ )
if one_based: plaintext_number -= 1
return chr(plaintext_number % 26 + alphabet_start)
else:
return ''.join(enciphered)
-class Keyword_wrap_alphabet(Enum):
+class KeywordWrapAlphabet(Enum):
"""Ways of wrapping the alphabet for keyword-based substitution ciphers."""
from_a = 1
from_last = 2
def keyword_cipher_alphabet_of(keyword,
- wrap_alphabet=Keyword_wrap_alphabet.from_a):
+ wrap_alphabet=KeywordWrapAlphabet.from_a):
"""Find the cipher alphabet given a keyword.
wrap_alphabet controls how the rest of the alphabet is added
after the keyword.
>>> keyword_cipher_alphabet_of('bayes')
'bayescdfghijklmnopqrtuvwxz'
- >>> keyword_cipher_alphabet_of('bayes', Keyword_wrap_alphabet.from_a)
+ >>> keyword_cipher_alphabet_of('bayes', KeywordWrapAlphabet.from_a)
'bayescdfghijklmnopqrtuvwxz'
- >>> keyword_cipher_alphabet_of('bayes', Keyword_wrap_alphabet.from_last)
+ >>> keyword_cipher_alphabet_of('bayes', KeywordWrapAlphabet.from_last)
'bayestuvwxzcdfghijklmnopqr'
- >>> keyword_cipher_alphabet_of('bayes', Keyword_wrap_alphabet.from_largest)
+ >>> keyword_cipher_alphabet_of('bayes', KeywordWrapAlphabet.from_largest)
'bayeszcdfghijklmnopqrtuvwx'
"""
- if wrap_alphabet == Keyword_wrap_alphabet.from_a:
+ if wrap_alphabet == KeywordWrapAlphabet.from_a:
cipher_alphabet = ''.join(deduplicate(sanitise(keyword) +
string.ascii_lowercase))
else:
- if wrap_alphabet == Keyword_wrap_alphabet.from_last:
+ if wrap_alphabet == KeywordWrapAlphabet.from_last:
last_keyword_letter = deduplicate(sanitise(keyword))[-1]
else:
last_keyword_letter = sorted(sanitise(keyword))[-1]
def keyword_encipher(message, keyword,
- wrap_alphabet=Keyword_wrap_alphabet.from_a):
+ wrap_alphabet=KeywordWrapAlphabet.from_a):
"""Enciphers a message with a keyword substitution cipher.
wrap_alphabet controls how the rest of the alphabet is added
after the keyword.
>>> keyword_encipher('test message', 'bayes')
'rsqr ksqqbds'
- >>> keyword_encipher('test message', 'bayes', Keyword_wrap_alphabet.from_a)
+ >>> keyword_encipher('test message', 'bayes', KeywordWrapAlphabet.from_a)
'rsqr ksqqbds'
- >>> keyword_encipher('test message', 'bayes', Keyword_wrap_alphabet.from_last)
+ >>> keyword_encipher('test message', 'bayes', KeywordWrapAlphabet.from_last)
'lskl dskkbus'
- >>> keyword_encipher('test message', 'bayes', Keyword_wrap_alphabet.from_largest)
+ >>> keyword_encipher('test message', 'bayes', KeywordWrapAlphabet.from_largest)
'qspq jsppbcs'
"""
cipher_alphabet = keyword_cipher_alphabet_of(keyword, wrap_alphabet)
cipher_translation = ''.maketrans(string.ascii_lowercase, cipher_alphabet)
return unaccent(message).lower().translate(cipher_translation)
-def keyword_decipher(message, keyword, wrap_alphabet=Keyword_wrap_alphabet.from_a):
+def keyword_decipher(message, keyword,
+ wrap_alphabet=KeywordWrapAlphabet.from_a):
"""Deciphers a message with a keyword substitution cipher.
wrap_alphabet controls how the rest of the alphabet is added
after the keyword.
>>> keyword_decipher('rsqr ksqqbds', 'bayes')
'test message'
- >>> keyword_decipher('rsqr ksqqbds', 'bayes', Keyword_wrap_alphabet.from_a)
+ >>> keyword_decipher('rsqr ksqqbds', 'bayes', KeywordWrapAlphabet.from_a)
'test message'
- >>> keyword_decipher('lskl dskkbus', 'bayes', Keyword_wrap_alphabet.from_last)
+ >>> keyword_decipher('lskl dskkbus', 'bayes', KeywordWrapAlphabet.from_last)
'test message'
- >>> keyword_decipher('qspq jsppbcs', 'bayes', Keyword_wrap_alphabet.from_largest)
+ >>> keyword_decipher('qspq jsppbcs', 'bayes', KeywordWrapAlphabet.from_largest)
'test message'
"""
cipher_alphabet = keyword_cipher_alphabet_of(keyword, wrap_alphabet)
pairs = zip(message, cycle(shifts))
return ''.join([caesar_decipher_letter(l, k) for l, k in pairs])
-beaufort_encipher=vigenere_decipher
-beaufort_decipher=vigenere_encipher
+beaufort_encipher = vigenere_decipher
+beaufort_decipher = vigenere_encipher
def transpositions_of(keyword):
"""Finds the transpostions given by a keyword. For instance, the keyword
'clever' rearranges to 'celrv', so the first column (0) stays first, the
- second column (1) moves to third, the third column (2) moves to second,
+ second column (1) moves to third, the third column (2) moves to second,
and so on.
If passed a tuple, assume it's already a transposition and just return it.
return padding
def column_transposition_encipher(message, keyword, fillvalue=' ',
- fillcolumnwise=False,
- emptycolumnwise=False):
+ fillcolumnwise=False,
+ emptycolumnwise=False):
"""Enciphers using the column transposition cipher.
Message is padded to allow all rows to be the same length.
return ''.join(chain(*transposed))
def column_transposition_decipher(message, keyword, fillvalue=' ',
- fillcolumnwise=False,
- emptycolumnwise=False):
+ fillcolumnwise=False,
+ emptycolumnwise=False):
"""Deciphers using the column transposition cipher.
Message is padded to allow all rows to be the same length.
"""
transpositions = [i for i in range(rows)]
return column_transposition_encipher(message, transpositions,
- fillvalue=fillvalue, fillcolumnwise=True, emptycolumnwise=False)
+ fillvalue=fillvalue, fillcolumnwise=True, emptycolumnwise=False)
def scytale_decipher(message, rows):
"""Deciphers using the scytale transposition cipher.
Assumes the message is padded so that all rows are the same length.
-
+
>>> scytale_decipher('tcnhkfeboqrxuo iw ', 3)
'thequickbrownfox '
>>> scytale_decipher('tubnhirfecooqkwx', 4)
ValueError: Wheel specification does not contain 26 letters
"""
if len(wheel_spec) != 13:
- raise ValueError("Wheel specification has {} pairs, requires 13".
- format(len(wheel_spec)))
+ raise ValueError("Wheel specification has {} pairs, requires"
+ " 13".format(len(wheel_spec)))
for p in wheel_spec:
if len(p) != 2:
raise ValueError("Not all mappings in wheel specification"
- "have two elements")
- if len(set([p[0] for p in wheel_spec] +
- [p[1] for p in wheel_spec])) != 26:
+ "have two elements")
+ if len(set([p[0] for p in wheel_spec] +
+ [p[1] for p in wheel_spec])) != 26:
raise ValueError("Wheel specification does not contain 26 letters")
def encipher_letter(self, letter):
projects / cipher-training.git / blobdiff