From da59b7226655f4644e4c9147353e6f3b6e5c6187 Mon Sep 17 00:00:00 2001 From: Neil Smith Date: Sun, 27 Mar 2016 13:16:30 +0100 Subject: [PATCH] Added cat and wcat utility functions --- cipher.py | 63 +++++++++++++++++++++++++++----------------------- cipherbreak.py | 8 +++---- 2 files changed, 38 insertions(+), 33 deletions(-) diff --git a/cipher.py b/cipher.py index 266237a..7ba5c62 100644 --- a/cipher.py +++ b/cipher.py @@ -9,6 +9,11 @@ from numpy import linalg from language_models import * +## Utility functions +cat = ''.join +wcat = ' '.join + + modular_division_table = [[0]*26 for _ in range(26)] for a in range(26): for b in range(26): @@ -31,7 +36,7 @@ def every_nth(text, n, fillvalue=''): ['afkpuz', 'bglqv!', 'chmrw!', 'dinsx!', 'ejoty!'] """ split_text = chunks(text, n, fillvalue) - return [''.join(l) for l in zip_longest(*split_text, fillvalue=fillvalue)] + return [cat(l) for l in zip_longest(*split_text, fillvalue=fillvalue)] def combine_every_nth(split_text): """Reforms a text split into every_nth strings @@ -43,7 +48,7 @@ def combine_every_nth(split_text): >>> combine_every_nth(every_nth(string.ascii_lowercase, 26)) 'abcdefghijklmnopqrstuvwxyz' """ - return ''.join([''.join(l) + return cat([cat(l) for l in zip_longest(*split_text, fillvalue='')]) def chunks(text, n, fillvalue=None): @@ -156,7 +161,7 @@ def caesar_encipher(message, shift): 'Jgnnq Yqtnf!' """ enciphered = [caesar_encipher_letter(l, shift) for l in message] - return ''.join(enciphered) + return cat(enciphered) def caesar_decipher(message, shift): """Decipher a message with the Caesar cipher of given shift @@ -175,10 +180,10 @@ def caesar_decipher(message, shift): def affine_encipher_letter(accented_letter, multiplier=1, adder=0, one_based=True): """Encipher a letter, given a multiplier and adder - >>> ''.join([affine_encipher_letter(l, 3, 5, True) \ + >>> cat([affine_encipher_letter(l, 3, 5, True) \ for l in string.ascii_uppercase]) 'HKNQTWZCFILORUXADGJMPSVYBE' - >>> ''.join([affine_encipher_letter(l, 3, 5, False) \ + >>> cat([affine_encipher_letter(l, 3, 5, False) \ for l in string.ascii_uppercase]) 'FILORUXADGJMPSVYBEHKNQTWZC' """ @@ -199,10 +204,10 @@ def affine_encipher_letter(accented_letter, multiplier=1, adder=0, one_based=Tru def affine_decipher_letter(letter, multiplier=1, adder=0, one_based=True): """Encipher a letter, given a multiplier and adder - >>> ''.join([affine_decipher_letter(l, 3, 5, True) \ + >>> cat([affine_decipher_letter(l, 3, 5, True) \ for l in 'HKNQTWZCFILORUXADGJMPSVYBE']) 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' - >>> ''.join([affine_decipher_letter(l, 3, 5, False) \ + >>> cat([affine_decipher_letter(l, 3, 5, False) \ for l in 'FILORUXADGJMPSVYBEHKNQTWZC']) 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' """ @@ -230,7 +235,7 @@ def affine_encipher(message, multiplier=1, adder=0, one_based=True): """ enciphered = [affine_encipher_letter(l, multiplier, adder, one_based) for l in message] - return ''.join(enciphered) + return cat(enciphered) def affine_decipher(message, multiplier=1, adder=0, one_based=True): """Decipher a message @@ -241,7 +246,7 @@ def affine_decipher(message, multiplier=1, adder=0, one_based=True): """ enciphered = [affine_decipher_letter(l, multiplier, adder, one_based) for l in message] - return ''.join(enciphered) + return cat(enciphered) class KeywordWrapAlphabet(Enum): @@ -265,7 +270,7 @@ def keyword_cipher_alphabet_of(keyword, wrap_alphabet=KeywordWrapAlphabet.from_a 'bayeszcdfghijklmnopqrtuvwx' """ if wrap_alphabet == KeywordWrapAlphabet.from_a: - cipher_alphabet = ''.join(deduplicate(sanitise(keyword) + + cipher_alphabet = cat(deduplicate(sanitise(keyword) + string.ascii_lowercase)) else: if wrap_alphabet == KeywordWrapAlphabet.from_last: @@ -274,7 +279,7 @@ def keyword_cipher_alphabet_of(keyword, wrap_alphabet=KeywordWrapAlphabet.from_a last_keyword_letter = sorted(sanitise(keyword))[-1] last_keyword_position = string.ascii_lowercase.find( last_keyword_letter) + 1 - cipher_alphabet = ''.join( + cipher_alphabet = cat( deduplicate(sanitise(keyword) + string.ascii_lowercase[last_keyword_position:] + string.ascii_lowercase)) @@ -332,7 +337,7 @@ def vigenere_encipher(message, keyword): """ shifts = [ord(l) - ord('a') for l in sanitise(keyword)] pairs = zip(message, cycle(shifts)) - return ''.join([caesar_encipher_letter(l, k) for l, k in pairs]) + return cat([caesar_encipher_letter(l, k) for l, k in pairs]) def vigenere_decipher(message, keyword): """Vigenere decipher @@ -342,7 +347,7 @@ def vigenere_decipher(message, keyword): """ shifts = [ord(l) - ord('a') for l in sanitise(keyword)] pairs = zip(message, cycle(shifts)) - return ''.join([caesar_decipher_letter(l, k) for l, k in pairs]) + return cat([caesar_decipher_letter(l, k) for l, k in pairs]) beaufort_encipher=vigenere_decipher beaufort_decipher=vigenere_encipher @@ -428,7 +433,7 @@ def column_transposition_encipher(message, keyword, fillvalue=' ', if emptycolumnwise: return combine_every_nth(transposed) else: - return ''.join(chain(*transposed)) + return cat(chain(*transposed)) def column_transposition_decipher(message, keyword, fillvalue=' ', fillcolumnwise=False, @@ -463,7 +468,7 @@ def column_transposition_decipher(message, keyword, fillvalue=' ', if fillcolumnwise: return combine_every_nth(untransposed) else: - return ''.join(chain(*untransposed)) + return cat(chain(*untransposed)) def scytale_encipher(message, rows, fillvalue=' '): """Enciphers using the scytale transposition cipher. @@ -544,14 +549,14 @@ def railfence_encipher(message, height, fillvalue=''): sections = chunks(message, (height - 1) * 2, fillvalue=fillvalue) n_sections = len(sections) # Add the top row - rows = [''.join([s[0] for s in sections])] + rows = [cat([s[0] for s in sections])] # process the middle rows of the grid for r in range(1, height-1): - rows += [''.join([s[r:r+1] + s[height*2-r-2:height*2-r-1] for s in sections])] + rows += [cat([s[r:r+1] + s[height*2-r-2:height*2-r-1] for s in sections])] # process the bottom row - rows += [''.join([s[height - 1:height] for s in sections])] - # rows += [' '.join([s[height - 1] for s in sections])] - return ''.join(rows) + rows += [cat([s[height - 1:height] for s in sections])] + # rows += [wcat([s[height - 1] for s in sections])] + return cat(rows) def railfence_decipher(message, height, fillvalue=''): """Railfence decipher. @@ -626,11 +631,11 @@ def railfence_decipher(message, height, fillvalue=''): down_rows = [rows[0]] up_rows = [] for i in range(1, height-1): - down_rows += [''.join([c for n, c in enumerate(rows[i]) if n % 2 == 0])] - up_rows += [''.join([c for n, c in enumerate(rows[i]) if n % 2 == 1])] + down_rows += [cat([c for n, c in enumerate(rows[i]) if n % 2 == 0])] + up_rows += [cat([c for n, c in enumerate(rows[i]) if n % 2 == 1])] down_rows += [rows[-1]] up_rows.reverse() - return ''.join(c for r in zip_longest(*(down_rows + up_rows), fillvalue='') for c in r) + return cat(c for r in zip_longest(*(down_rows + up_rows), fillvalue='') for c in r) def make_cadenus_keycolumn(doubled_letters = 'vw', start='a', reverse=False): """Makes the key column for a Cadenus cipher (the column down between the @@ -666,7 +671,7 @@ def make_cadenus_keycolumn(doubled_letters = 'vw', start='a', reverse=False): index_to_remove = string.ascii_lowercase.find(doubled_letters[0]) short_alphabet = string.ascii_lowercase[:index_to_remove] + string.ascii_lowercase[index_to_remove+1:] if reverse: - short_alphabet = ''.join(reversed(short_alphabet)) + short_alphabet = cat(reversed(short_alphabet)) start_pos = short_alphabet.find(start) rotated_alphabet = short_alphabet[start_pos:] + short_alphabet[:start_pos] keycolumn = {l: i for i, l in enumerate(rotated_alphabet)} @@ -695,7 +700,7 @@ def cadenus_encipher(message, keyword, keycolumn, fillvalue='a'): rotated_rows = zip(*rotated_columns) transpositions = transpositions_of(keyword) transposed = [transpose(r, transpositions) for r in rotated_rows] - return ''.join(chain(*transposed)) + return cat(chain(*transposed)) def cadenus_decipher(message, keyword, keycolumn, fillvalue='a'): """ @@ -717,7 +722,7 @@ def cadenus_decipher(message, keyword, keycolumn, fillvalue='a'): rotated_columns = [col[-start:] + col[:-start] for start, col in zip([keycolumn[l] for l in keyword], columns)] rotated_rows = zip(*rotated_columns) # return rotated_columns - return ''.join(chain(*rotated_rows)) + return cat(chain(*rotated_rows)) def hill_encipher(matrix, message_letters, fillvalue='a'): @@ -740,7 +745,7 @@ def hill_encipher(matrix, message_letters, fillvalue='a'): # message_chunks = chunks(message, len(matrix), fillvalue=None) enciphered_chunks = [((matrix * np.matrix(c).T).T).tolist()[0] for c in message_chunks] - return ''.join([chr(int(round(l)) % 26 + ord('a')) + return cat([chr(int(round(l)) % 26 + ord('a')) for l in sum(enciphered_chunks, [])]) def hill_decipher(matrix, message, fillvalue='a'): @@ -889,7 +894,7 @@ def amsco_transposition_decipher(message, keyword, for slice in transposed_sections: plaintext_list[slice.index] = message[current_pos:current_pos-slice.start+slice.end][:len(message[slice.start:slice.end])] current_pos += len(message[slice.start:slice.end]) - return ''.join(plaintext_list) + return cat(plaintext_list) class PocketEnigma(object): @@ -990,7 +995,7 @@ class PocketEnigma(object): >>> pe.set_position('f') 5 - >>> ''.join([pe.lookup(l) for l in string.ascii_lowercase]) + >>> cat([pe.lookup(l) for l in string.ascii_lowercase]) 'udhbfejcpgmokrliwntsayqzvx' >>> pe.lookup('A') '' diff --git a/cipherbreak.py b/cipherbreak.py index 1a589c2..02e63c5 100644 --- a/cipherbreak.py +++ b/cipherbreak.py @@ -204,7 +204,7 @@ def monoalphabetic_break_hillclimbing(message, max_iterations=10000000, if not alphabet: alphabet = list(string.ascii_lowercase) random.shuffle(alphabet) - alphabet = ''.join(alphabet) + alphabet = cat(alphabet) return monoalphabetic_break_hillclimbing_worker(ciphertext, alphabet, max_iterations, fitness) @@ -218,7 +218,7 @@ def monoalphabetic_break_hillclimbing_mp(message, workers=10, else: this_alphabet = list(string.ascii_lowercase) random.shuffle(this_alphabet) - this_alphabet = ''.join(this_alphabet) + this_alphabet = cat(this_alphabet) worker_args.append((ciphertext, this_alphabet, max_iterations, fitness)) with Pool() as pool: breaks = pool.starmap(monoalphabetic_break_hillclimbing_worker, @@ -290,7 +290,7 @@ def vigenere_frequency_break(message, max_key_length=20, fitness=Pletters): """ def worker(message, key_length, fitness): splits = every_nth(sanitised_message, key_length) - key = ''.join([chr(caesar_break(s)[0] + ord('a')) for s in splits]) + key = cat([chr(caesar_break(s)[0] + ord('a')) for s in splits]) plaintext = vigenere_decipher(message, key) fit = fitness(plaintext) return key, fit @@ -314,7 +314,7 @@ def beaufort_frequency_break(message, max_key_length=20, fitness=Pletters): """ def worker(message, key_length, fitness): splits = every_nth(sanitised_message, key_length) - key = ''.join([chr(-caesar_break(s)[0] % 26 + ord('a')) + key = cat([chr(-caesar_break(s)[0] % 26 + ord('a')) for s in splits]) plaintext = beaufort_decipher(message, key) fit = fitness(plaintext) -- 2.34.1