},
"outputs": [],
"source": [
- "import string"
+ "import string\n",
+ "import itertools"
]
},
{
"cell_type": "code",
- "execution_count": 40,
+ "execution_count": 6,
"metadata": {
"collapsed": true
},
},
{
"cell_type": "code",
- "execution_count": 41,
+ "execution_count": 7,
"metadata": {
"collapsed": false
},
"'thequickbrownfoxjumpedoverthelzydoga'"
]
},
- "execution_count": 41,
+ "execution_count": 7,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 2,
+ "execution_count": 12,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
- "def encipher_letter(previous, current):\n",
- " new = (ord(previous) + ord(current) - 2 * ord('a')) % 26\n",
+ "def encipher_letter(key, current):\n",
+ " new = (ord(key) + ord(current) - 2 * ord('a')) % 26\n",
" return chr(new + ord('a'))"
]
},
{
"cell_type": "code",
- "execution_count": 15,
+ "execution_count": 9,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
- "def decipher_letter(previous, current):\n",
- " new = (ord(current) - ord(previous) - 2 * ord('a')) % 26\n",
+ "def decipher_letter(key, current):\n",
+ " new = (ord(current) - ord(key)) % 26\n",
" return chr(new + ord('a'))"
]
},
{
"cell_type": "code",
- "execution_count": 4,
+ "execution_count": 13,
"metadata": {
"collapsed": false
},
"'a'"
]
},
- "execution_count": 4,
+ "execution_count": 13,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 6,
+ "execution_count": 14,
"metadata": {
"collapsed": false
},
"'abcdefghijklmnopqrstuvwxyz'"
]
},
- "execution_count": 6,
+ "execution_count": 14,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 7,
+ "execution_count": 15,
"metadata": {
"collapsed": false
},
"'bcdefghijklmnopqrstuvwxyza'"
]
},
- "execution_count": 7,
+ "execution_count": 15,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 17,
+ "execution_count": 16,
"metadata": {
"collapsed": false
},
"'abcdefghijklmnopqrstuvwxyz'"
]
},
- "execution_count": 17,
+ "execution_count": 16,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 18,
+ "execution_count": 17,
"metadata": {
"collapsed": false
},
{
"data": {
"text/plain": [
- "'b'"
+ "'zabcdefghijklmnopqrstuvwxy'"
]
},
- "execution_count": 18,
+ "execution_count": 17,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "decipher_letter('a', 'b')"
+ "''.join(decipher_letter('b', l) for l in string.ascii_lowercase)"
]
},
{
- "cell_type": "markdown",
- "metadata": {},
+ "cell_type": "code",
+ "execution_count": 18,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "'b'"
+ ]
+ },
+ "execution_count": 18,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
"source": [
- "e = (p + c) % 26\n",
- "c = e - p"
+ "decipher_letter('a', 'b')"
]
},
{
"cell_type": "code",
- "execution_count": 20,
+ "execution_count": 19,
"metadata": {
"collapsed": false
},
"'abcdefghijklmnopqrstuvwxyzbcdefghijklmnopqrstuvwxyzacdefghijklmnopqrstuvwxyzabdefghijklmnopqrstuvwxyzabcefghijklmnopqrstuvwxyzabcdfghijklmnopqrstuvwxyzabcdeghijklmnopqrstuvwxyzabcdefhijklmnopqrstuvwxyzabcdefgijklmnopqrstuvwxyzabcdefghjklmnopqrstuvwxyzabcdefghiklmnopqrstuvwxyzabcdefghijlmnopqrstuvwxyzabcdefghijkmnopqrstuvwxyzabcdefghijklnopqrstuvwxyzabcdefghijklmopqrstuvwxyzabcdefghijklmnpqrstuvwxyzabcdefghijklmnoqrstuvwxyzabcdefghijklmnoprstuvwxyzabcdefghijklmnopqstuvwxyzabcdefghijklmnopqrtuvwxyzabcdefghijklmnopqrsuvwxyzabcdefghijklmnopqrstvwxyzabcdefghijklmnopqrstuwxyzabcdefghijklmnopqrstuvxyzabcdefghijklmnopqrstuvwyzabcdefghijklmnopqrstuvwxzabcdefghijklmnopqrstuvwxy'"
]
},
- "execution_count": 20,
+ "execution_count": 19,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "''.join(encipher_letter(k, l) for l in string.ascii_lowercase for k in string.ascii_lowercase)"
+ "''.join(encipher_letter(k, l) \n",
+ " for l in string.ascii_lowercase \n",
+ " for k in string.ascii_lowercase)"
]
},
{
"cell_type": "code",
- "execution_count": 21,
+ "execution_count": 20,
"metadata": {
"collapsed": false
},
" ('j', 'a', 'j')]"
]
},
- "execution_count": 21,
+ "execution_count": 20,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "encrypted = [(k, l, encipher_letter(k, l)) for l in string.ascii_lowercase for k in string.ascii_lowercase]\n",
+ "encrypted = [(k, l, encipher_letter(k, l)) \n",
+ " for l in string.ascii_lowercase \n",
+ " for k in string.ascii_lowercase]\n",
"encrypted[:10]"
]
},
{
"cell_type": "code",
- "execution_count": 22,
+ "execution_count": 21,
"metadata": {
"collapsed": false
},
"True"
]
},
- "execution_count": 22,
+ "execution_count": 21,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 55,
+ "execution_count": 32,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
- "def encipher_message(plaintext, key='a'):\n",
+ "def encipher_message(plaintext, keystring='key'):\n",
+ " key = itertools.cycle(keystring)\n",
" ciphertext = ''\n",
- " previous = key\n",
- " for letter in plaintext:\n",
- " cipherletter = encipher_letter(previous, letter)\n",
+ " previous = keystring[0]\n",
+ " for letter, keychar in zip(plaintext, key):\n",
+ " cipherletter = encipher_letter(keychar, letter)\n",
" ciphertext += cipherletter\n",
" previous = cipherletter\n",
" # previous = letter\n",
},
{
"cell_type": "code",
- "execution_count": 56,
+ "execution_count": 23,
"metadata": {
"collapsed": false
},
{
"data": {
"text/plain": [
- "'hlwhv'"
+ "'hecoj'"
]
},
- "execution_count": 56,
+ "execution_count": 23,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "encipher_message('hello')"
+ "encipher_message('hello', 'aardvark')"
]
},
{
"cell_type": "code",
- "execution_count": 57,
+ "execution_count": 24,
"metadata": {
"collapsed": false
},
{
"data": {
"text/plain": [
- "'xbmxl'"
+ "'xubbe'"
]
},
- "execution_count": 57,
+ "execution_count": 24,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 54,
+ "execution_count": 33,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
- "def decipher_message(ciphertext, key='a'):\n",
+ "def decipher_message(ciphertext, keystring='key'):\n",
+ " key = itertools.cycle(keystring)\n",
" plaintext = ''\n",
- " previous = key\n",
- " for letter in ciphertext:\n",
- " plainletter = decipher_letter(previous, letter)\n",
+ " previous = keystring[0]\n",
+ " for letter, keychar in zip(ciphertext, key):\n",
+ " plainletter = decipher_letter(keychar, letter)\n",
" plaintext += plainletter\n",
" previous = letter\n",
" # previous = plainletter\n",
},
{
"cell_type": "code",
- "execution_count": 58,
+ "execution_count": 27,
"metadata": {
"collapsed": false
},
"'hello'"
]
},
- "execution_count": 58,
+ "execution_count": 27,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "decipher_message('hlwhv')"
+ "decipher_message('hecoj', 'aardvark')"
]
},
{
"cell_type": "code",
- "execution_count": 59,
+ "execution_count": 28,
"metadata": {
"collapsed": false
},
{
"data": {
"text/plain": [
- "'xello'"
+ "'hello'"
]
},
- "execution_count": 59,
+ "execution_count": 28,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "decipher_message('xbmxl')"
+ "decipher_message('xubbe', 'q')"
]
},
{
"cell_type": "code",
- "execution_count": 60,
+ "execution_count": 31,
"metadata": {
"collapsed": false
},
{
"data": {
"text/plain": [
- "'hello'"
+ "'romyt'"
]
},
- "execution_count": 60,
+ "execution_count": 31,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "decipher_message('xbmxl', 'q')"
+ "decipher_message('hecoj', 'q')"
]
},
{
"cell_type": "code",
- "execution_count": 61,
+ "execution_count": 34,
"metadata": {
"collapsed": false
},
{
"data": {
"text/plain": [
- "'hlwhvjxlznbpdrfthvjxlznbpd'"
+ "'rijvsmysmysmysmysmysmysmys'"
]
},
- "execution_count": 61,
+ "execution_count": 34,
"metadata": {},
"output_type": "execute_result"
}
},
{
"cell_type": "code",
- "execution_count": 62,
+ "execution_count": 35,
"metadata": {
"collapsed": false
},
"'helloooooooooooooooooooooo'"
]
},
- "execution_count": 62,
+ "execution_count": 35,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "decipher_message('rijvsmysmysmysmysmysmysmys')"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 36,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "'qhiurlxrlxrlxrlxrlxrlxrlxr'"
+ ]
+ },
+ "execution_count": 36,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "decipher_message('rijvsmysmysmysmysmysmysmys', 'b')"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 37,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "'dlghpjalicxktzjayi'"
+ ]
+ },
+ "execution_count": 37,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "encipher_message(sanitised('This is a test message'), 'keyphrase')"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 38,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "'thisisatestmessage'"
+ ]
+ },
+ "execution_count": 38,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
- "decipher_message('hlwhvjxlznbpdrfthvjxlznbpd')"
+ "decipher_message('dlghpjalicxktzjayi', 'keyphrase')"
]
},
{
projects / computing-unplugged-book.git / blobdiff