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patleeman/cipherizer.py

Last active October 2, 2015 13:39
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Basic vigenere's cipher encoder and decoder.
Raw
cipherizer.py
def main():
action = 0
cipherizer = """
_____ _ _ _ ______
/ __ (_) | | (_)|___ /
| / \/_ _ __ | |__ ___ _ __ _ / / ___ _ __
| | | | '_ \| '_ \ / _ \ '__| | / / / _ \ '__|
| \__/\ | |_) | | | | __/ | | |./ /__| __/ |
\____/_| .__/|_| |_|\___|_| |_|\_____/\___|_|
| |
|_| """
print(cipherizer)
print(' Welcome to CipheriZer v. 1.0')
print(' Please choose an option:')
print(' 1: Encode a message')
print(' 2: Decode a message')
print(' 3: Help')
print(' 4: Exit')
print('')
action = input('Choose an action: ')
while True:
if action == '1':
encode_get_message()
return False
#encode message fn
elif action == '2':
decode_get_message()
return False
#decode message fn
elif action == '3':
help()
return False
#print help
elif action == '4':
print('')
print('')
print('bye bye')
return False
else:
print('')
print('')
print('Please choose a valid option. ')
print('')
print('')
main()
#NUMBER CRUNCHER
#numbercruncher converts letters into a list of numbers
def numbercruncher(text):
dict = {
' ':0,
'a':1,
'b':2,
'c':3,
'd':4,
'e':5,
'f':6,
'g':7,
'h':8,
'i':9,
'j':10,
'k':11,
'l':12,
'm':13,
'n':14,
'o':15,
'p':16,
'q':17,
'r':18,
's':19,
't':20,
'u':21,
'v':22,
'w':23,
'x':24,
'y':25,
'z':26,
'A':27,
'B':28,
'C':29,
'D':30,
'E':31,
'F':32,
'G':33,
'H':34,
'I':35,
'J':36,
'K':37,
'L':38,
'M':39,
'N':40,
'O':41,
'P':42,
'Q':43,
'R':44,
'S':45,
'T':46,
'U':47,
'V':48,
'W':49,
'X':50,
'Y':51,
'Z':52,
'.':53,
'!':54,
'?':55,
'1':56,
'2':57,
'3':58,
'4':59,
'5':60,
'6':61,
'7':62,
'8':63,
'9':64,
'0':65}
textstring = list(text)
listlength = len(textstring)
output = []
letter = ''
dictnumber = 0
i = 0
while i != listlength:
letter = textstring[i]
dictnumber = dict[letter]
output.append(dictnumber)
i += 1
return output
#LETTER CRUNCHER
#lettercruncher converts numbers into a list of letters
def lettercruncher(numlist):
dict = {
0:' ',
1:'a',
2:'b',
3:'c',
4:'d',
5:'e',
6:'f',
7:'g',
8:'h',
9:'i',
10:'j',
11:'k',
12:'l',
13:'m',
14:'n',
15:'o',
16:'p',
17:'q',
18:'r',
19:'s',
20:'t',
21:'u',
22:'v',
23:'w',
24:'x',
25:'y',
26:'z',
27:'A',
28:'B',
29:'C',
30:'D',
31:'E',
32:'F',
33:'G',
34:'H',
35:'I',
36:'J',
37:'K',
38:'L',
39:'M',
40:'N',
41:'O',
42:'P',
43:'Q',
44:'R',
45:'S',
46:'T',
47:'U',
48:'V',
49:'W',
50:'X',
51:'Y',
52:'Z',
53:'.',
54:'!',
55:'?',
56:'1',
57:'2',
58:'3',
59:'4',
60:'5',
61:'6',
62:'7',
63:'8',
64:'9',
65:'0'}
numstring = list(numlist)
listlength = len(numstring)
output = []
number = 0
dictletter = ''
i = 0
while i != listlength:
number = numstring[i]
dictnumber = dict[number]
output.append(dictnumber)
i += 1
return output
#ENCODE
#encode_get_message will convert your message to a list of numbers, then pass it to the encode_msg fn.
def encode_get_message():
try:
print('')
print('')
print(' The key and message are case sensitive!')
print(' Allowed symbols: .!?')
print('')
print('')
key = input('Please enter your private key: ')
text = input('Please enter your message: ')
keylength = len(key)
textlength = len(text)
i = 0
j = 0
longkey = ''
if keylength > textlength:
print('')
print(' The key must be shorter than the text')
print('')
encode()
else:
while i != textlength:
longkey = longkey + key[j]
i += 1
j += 1
j = j % keylength
encode_msg(longkey, text)
return longkey
except:
print('')
print('')
print(' !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!')
print(' There was a problem!')
print(' The only symbols allowed are !?.')
print(' Please try again')
print(' !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!')
print('')
encode_get_message()
#This does the encryption by adding the message and key.
def encode_msg(lk, txt):
keynum = numbercruncher(lk)
textnum = numbercruncher(txt)
cipher = []
end = len(txt)
i = 0
while i != end:
cipheredtext =(keynum[i]+textnum[i]) % 65
cipher.append(cipheredtext)
i+=1
output = ''.join(lettercruncher(cipher))
print('')
print(' /////////////////////////////////')
print('')
print(' Here is your encrypted message:')
print(' %s' % output)
print('')
print(' /////////////////////////////////')
print('')
print('')
input('Press enter to continue')
main()
#DECODE
#This function asks for the encrypted text and key and converts it to a list of numbers.
def decode_get_message():
try:
print('')
print('')
print(' The key and encrypted message are case sensitive!')
print(' Allowed symbols: .!?')
print('')
print('')
key = input('Please enter your private key: ')
text = input('Please enter your encrypted message: ')
keylength = len(key)
textlength = len(text)
i = 0
j = 0
longkey = ''
if keylength > textlength:
print('')
print(' The key must be shorter than the text')
print('')
encode()
else:
while i != textlength:
longkey = longkey + key[j]
i += 1
j += 1
j = j % keylength
decode_msg(longkey, text)
return longkey
except:
print('')
print('')
print(' !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!')
print(' There was a problem!')
print(' The only symbols allowed are !?.')
print(' Please try again')
print(' !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!')
decode_get_message()
#This function outputs the decoded message.
def decode_msg(lk, txt):
keynum = numbercruncher(lk)
textnum = numbercruncher(txt)
cipher = []
end = len(txt)
i = 0
while i != end:
cipheredtext = (textnum[i] - keynum[i]) % 65
cipher.append(cipheredtext)
i+=1
output = ''.join(lettercruncher(cipher))
print('')
print(' /////////////////////////////////')
print('')
print(' Here is your decrypted message:')
print(' %s' % output)
print('')
print(' /////////////////////////////////')
print('')
input('Press enter to continue')
main()
def help():
print('')
print('')
print(' How to use CipheriZer')
print('')
print(' To use this simple Vigeneres cipher:')
print(' 1: You and your friend agree on a private key. Preferably in person and in a safe location.')
print(' 2: To encrypt a message to send, type in the private key then your message')
print(' 3: Send the encrypted message to your friend')
print(' 4: Your friend can decrypt the message using the agreed upon private key')
print('')
print('')
print(' This program was created by Patrick Lee')
print(' http://www.patricklee.nyc')
print('')
print('')
print('')
input('Press enter to continue')
main()
main()
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