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Posted By

yarvin on 10/08/08


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simple easy Encryption


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Letter back encryption

 / Published in: Python
 

simple encryption program written just for fun. Usage: $ python letterback.py -e "alvin" zkuhm $ python letterback.py -d "zkuhm" alvin Or in the python interpreter. In [1]: import letterback In [2]: lb = letterback.LetterBack() In [3]: lb.encrypt("alvin") zkuhm In [4]: lb.decrypt("zkuhm") alvin

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  1. import sys
  2.  
  3. alphabet = 'abcdefghijklmnopqrstuvwxyz'
  4.  
  5. class LetterBack:
  6.     '''Class for Encrypting a string of letters'''
  7.  
  8.     def __init__(self, text='mnm'):
  9.         self.text = text
  10.  
  11.     def encrypt(self, aSentance):
  12.         '''Encrypts a given string by replacing each letter
  13.         with the letter before it in the alphabet.'''
  14.         output = ''
  15.         for element in aSentance:
  16.             for i in range(26):
  17.                 if element == alphabet[i]:
  18.                     output += alphabet[i-1]
  19.         print output
  20.  
  21.     def decrypt(self, aSentance):
  22.         '''Decrypts a given string encoded by the encrypt
  23.          function.'''
  24.         output = ''
  25.         for element in aSentance:
  26.             #print element + ' this is 1'
  27.             for i in range(26):
  28.                 if element == alphabet[i-1]:
  29.                     output += alphabet[i]
  30.         print output
  31.  
  32. def main():
  33.     lb = LetterBack()
  34.     if sys.argv[1] == '-e':
  35.         lb.encrypt(sys.argv[2])
  36.     elif sys.argv[1] == '-d':
  37.         lb.decrypt(sys.argv[2])
  38.  
  39. if __name__ == '__main__':
  40.     main()

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