23 "def sanitised(text):\n",
24 " return ''.join(letter.lower() for letter in text if letter in string.ascii_letters)"
37 "'thequickbrownfoxjumpedoverthelzydoga'"
42 "output_type": "execute_result"
46 "sanitised('The quick brown fox! jumped OVER the l\\a!z%y* dog....a')"
57 "def encipher_letter(previous, key, current):\n",
58 " new = (ord(previous) + ord(key) + ord(current) - 3 * ord('a')) % 26\n",
59 " return chr(new + ord('a'))"
64 "execution_count": 17,
70 "def decipher_letter(previous, key, current):\n",
71 " new = (ord(current) - ord(key) - ord(previous) + ord('a')) % 26\n",
72 " return chr(new + ord('a'))"
90 "output_type": "execute_result"
94 "encipher_letter('a', 'a', 'a')"
107 "'abcdefghijklmnopqrstuvwxyz'"
110 "execution_count": 8,
112 "output_type": "execute_result"
116 "''.join(encipher_letter('a', 'a', l) for l in string.ascii_lowercase)"
121 "execution_count": 9,
129 "'cdefghijklmnopqrstuvwxyzab'"
132 "execution_count": 9,
134 "output_type": "execute_result"
138 "''.join(encipher_letter('b', 'b', l) for l in string.ascii_lowercase)"
143 "execution_count": 18,
151 "'abcdefghijklmnopqrstuvwxyz'"
154 "execution_count": 18,
156 "output_type": "execute_result"
160 "''.join(decipher_letter('a', 'a', l) for l in string.ascii_lowercase)"
165 "execution_count": 21,
173 "'yzabcdefghijklmnopqrstuvwx'"
176 "execution_count": 21,
178 "output_type": "execute_result"
182 "''.join(decipher_letter('b', 'b', l) for l in string.ascii_lowercase)"
187 "execution_count": 20,
198 "execution_count": 20,
200 "output_type": "execute_result"
204 "decipher_letter('a', 'a', 'b')"
209 "execution_count": 23,
217 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220 "execution_count": 23,
222 "output_type": "execute_result"
226 "''.join(encipher_letter(k, p, l) \n",
227 " for l in string.ascii_lowercase \n",
228 " for k in string.ascii_lowercase \n",
229 " for p in string.ascii_lowercase)"
234 "execution_count": 24,
242 "[('a', 'a', 'a', 'a'),\n",
243 " ('a', 'b', 'a', 'b'),\n",
244 " ('a', 'c', 'a', 'c'),\n",
245 " ('a', 'd', 'a', 'd'),\n",
246 " ('a', 'e', 'a', 'e'),\n",
247 " ('a', 'f', 'a', 'f'),\n",
248 " ('a', 'g', 'a', 'g'),\n",
249 " ('a', 'h', 'a', 'h'),\n",
250 " ('a', 'i', 'a', 'i'),\n",
251 " ('a', 'j', 'a', 'j')]"
254 "execution_count": 24,
256 "output_type": "execute_result"
260 "encrypted = [(k, p, l, encipher_letter(k, p, l)) \n",
261 " for l in string.ascii_lowercase \n",
262 " for k in string.ascii_lowercase\n",
263 " for p in string.ascii_lowercase]\n",
269 "execution_count": 25,
280 "execution_count": 25,
282 "output_type": "execute_result"
286 "all(l == decipher_letter(k, p, e) for k, l, p, e in encrypted)"
291 "execution_count": 39,
297 "def encipher_message(plaintext, keystring='a'):\n",
298 " key = itertools.cycle(keystring)\n",
299 " ciphertext = ''\n",
300 " previous = keystring[0]\n",
301 " for letter, keychar in zip(plaintext, key):\n",
302 " cipherletter = encipher_letter(previous, keychar, letter)\n",
303 " ciphertext += cipherletter\n",
304 " previous = cipherletter\n",
305 " # previous = letter\n",
311 "execution_count": 40,
322 "execution_count": 40,
324 "output_type": "execute_result"
328 "encipher_message('hello', 'aardvark')"
333 "execution_count": 41,
344 "execution_count": 41,
346 "output_type": "execute_result"
350 "encipher_message('hello', 'q')"
355 "execution_count": 42,
361 "def decipher_message(ciphertext, keystring='a'):\n",
362 " key = itertools.cycle(keystring)\n",
364 " previous = keystring[0]\n",
365 " for letter, keychar in zip(ciphertext, key):\n",
366 " plainletter = decipher_letter(previous, keychar, letter)\n",
367 " plaintext += plainletter\n",
368 " previous = letter\n",
369 " # previous = plainletter\n",
375 "execution_count": 43,
386 "execution_count": 43,
388 "output_type": "execute_result"
392 "decipher_message('hlnbk', 'aardvark')"
397 "execution_count": 44,
408 "execution_count": 44,
410 "output_type": "execute_result"
414 "decipher_message('nhijn', 'q')"
419 "execution_count": 45,
430 "execution_count": 45,
432 "output_type": "execute_result"
436 "decipher_message('hlnbk')"
441 "execution_count": 46,
449 "'hlwhvjxlznbpdrfthvjxlznbpd'"
452 "execution_count": 46,
454 "output_type": "execute_result"
458 "encipher_message('helloooooooooooooooooooooo')"
463 "execution_count": 47,
471 "'helloooooooooooooooooooooo'"
474 "execution_count": 47,
476 "output_type": "execute_result"
480 "decipher_message('hlwhvjxlznbpdrfthvjxlznbpd')"
485 "execution_count": 48,
493 "'fdkknnnnnnnnnnnnnnnnnnnnnn'"
496 "execution_count": 48,
498 "output_type": "execute_result"
502 "decipher_message('hlwhvjxlznbpdrfthvjxlznbpd', 'b')"
507 "execution_count": null,
517 "display_name": "Python 3",
518 "language": "python",
526 "file_extension": ".py",
527 "mimetype": "text/x-python",
529 "nbconvert_exporter": "python",
530 "pygments_lexer": "ipython3",