Programming Forums > Script Programming > Python

Sane · Feb 26th, 2006, 1:49 PM

I combined a VigenereCypher with Sha-1 - I call it... Vigsha!

Hehe... It also uses base64.

I think this encryption makes it practically impossible to retreive a file's contents without the password.

EDIT I put it up on my website. Check it out: http://jammersbase.ath.cx/vigsha :banana:

Here's the simple code:

(Toggle Plain Text)

from sha import sha
from base64 import encodestring, decodestring

def VigenereCypher(t, k, h=26, o=65):
    g = len(k)
    return ''.join(chr((ord(k[a%g]) + ord(t[a])) % h + o) for a in range(len(t)))

def SolveCypher(t, k, h=26, o=65):
    g = len(k)
    return ''.join(chr((ord(t[a]) - ord(k[a%g])) % h + o) for a in range(len(t))) 

def EncodeFile(settings):
    result = VigenereCypher(encodestring(open(settings['FileIn'], 'r').read()),
                            sha(settings['Password']).hexdigest(),
                            settings['Bits'],
                            settings['Offset'])

    file = open(settings['FileOut'], 'w')
    file.write(result)
    file.close()

def DecodeFile(settings):
    result = SolveCypher(   open(settings['FileIn'], 'r').read(),
                            sha(settings['Password']).hexdigest(),
                            settings['Bits'],
                            settings['Offset'])
                           
    file = open(settings['FileOut'], 'w')
    file.write(decodestring(result))
    file.close()    


if __name__ == '__main__':

    settings1 = {
            'Password' : 'testing vigsha encryption',
            'FileIn'   : 'Vigsha.py',
            'FileOut'  : 'Vigsha_encrypt.py',
            'Bits'     : 255,
            'Offset'   : 0
                }

    settings2 = {
            'Password' : 'testing vigsha encryption',
            'FileIn'   : 'Vigsha_encrypt.py',
            'FileOut'  : 'Vigsha_solved.py',
            'Bits'     : 255,
            'Offset'   : 0
                }

    EncodeFile(settings1)
    DecodeFile(settings2)

Save as 'Vigsha.py' and run to see how it works. For every number you set back the 'bit' variable, you make the encryption stronger, but irreversable. It will error when trying to convert back, because it lost data during the x%h calculation.

I'm sure there are many potential flaws, but as it is currently, it seems to work great.

Feb 26th, 2006, 1:49 PM	#1
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	Interesting Encryption I combined a VigenereCypher with Sha-1 - I call it... Vigsha! Hehe... It also uses base64. I think this encryption makes it practically impossible to retreive a file's contents without the password. EDIT I put it up on my website. Check it out: http://jammersbase.ath.cx/vigsha :banana: Here's the simple code: (Toggle Plain Text) from sha import sha from base64 import encodestring, decodestring def VigenereCypher(t, k, h=26, o=65): g = len(k) return ''.join(chr((ord(k[a%g]) + ord(t[a])) % h + o) for a in range(len(t))) def SolveCypher(t, k, h=26, o=65): g = len(k) return ''.join(chr((ord(t[a]) - ord(k[a%g])) % h + o) for a in range(len(t))) def EncodeFile(settings): result = VigenereCypher(encodestring(open(settings['FileIn'], 'r').read()), sha(settings['Password']).hexdigest(), settings['Bits'], settings['Offset']) file = open(settings['FileOut'], 'w') file.write(result) file.close() def DecodeFile(settings): result = SolveCypher( open(settings['FileIn'], 'r').read(), sha(settings['Password']).hexdigest(), settings['Bits'], settings['Offset']) file = open(settings['FileOut'], 'w') file.write(decodestring(result)) file.close() if __name__ == '__main__': settings1 = { 'Password' : 'testing vigsha encryption', 'FileIn' : 'Vigsha.py', 'FileOut' : 'Vigsha_encrypt.py', 'Bits' : 255, 'Offset' : 0 } settings2 = { 'Password' : 'testing vigsha encryption', 'FileIn' : 'Vigsha_encrypt.py', 'FileOut' : 'Vigsha_solved.py', 'Bits' : 255, 'Offset' : 0 } EncodeFile(settings1) DecodeFile(settings2) from sha import sha from base64 import encodestring, decodestring def VigenereCypher(t, k, h=26, o=65): g = len(k) return ''.join(chr((ord(k[a%g]) + ord(t[a])) % h + o) for a in range(len(t))) def SolveCypher(t, k, h=26, o=65): g = len(k) return ''.join(chr((ord(t[a]) - ord(k[a%g])) % h + o) for a in range(len(t))) def EncodeFile(settings): result = VigenereCypher(encodestring(open(settings['FileIn'], 'r').read()), sha(settings['Password']).hexdigest(), settings['Bits'], settings['Offset']) file = open(settings['FileOut'], 'w') file.write(result) file.close() def DecodeFile(settings): result = SolveCypher( open(settings['FileIn'], 'r').read(), sha(settings['Password']).hexdigest(), settings['Bits'], settings['Offset']) file = open(settings['FileOut'], 'w') file.write(decodestring(result)) file.close() if __name__ == '__main__': settings1 = { 'Password' : 'testing vigsha encryption', 'FileIn' : 'Vigsha.py', 'FileOut' : 'Vigsha_encrypt.py', 'Bits' : 255, 'Offset' : 0 } settings2 = { 'Password' : 'testing vigsha encryption', 'FileIn' : 'Vigsha_encrypt.py', 'FileOut' : 'Vigsha_solved.py', 'Bits' : 255, 'Offset' : 0 } EncodeFile(settings1) DecodeFile(settings2) Save as 'Vigsha.py' and run to see how it works. For every number you set back the 'bit' variable, you make the encryption stronger, but irreversable. It will error when trying to convert back, because it lost data during the x%h calculation. I'm sure there are many potential flaws, but as it is currently, it seems to work great. Last edited by Sane; Feb 26th, 2006 at 2:16 PM.

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Programming Forums > Script Programming > Python

Interesting Encryption