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 To: Eric den Doop
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Subject: The Encryption Technique there is REVERSIBLE!
Thread ID: 32763 Message ID: 34242 # Views: 2 # Ratings: 0
Version: Visual FoxPro 8 Category: Security and Application Protection
Date: Thursday, December 11, 2003 2:37:07 AM         
   



for everybody's info,

all encryption technique is crackable. there is reverse engineering for the branding.

however, if foxite coders are interested for ONE WAY encryption, you could study about
Public Key Infrastructure (PKI) Technology.

when we say PKI, encrytion comes with 2 sets of keys. the first is the PUBLIC KEY and
the other one is PRIVATE KEY.

heres the scenario:

MyEncStr = Encrypt('Any Plain Text')
MyDecStr = Decrypt(MyEncStr) or
MyDecStr = Decrypt('Any Cipher Text')

common encryption algorithm is reversible... to make it more understandable its like this:

MyPlainValue = 8
MyEncValue = MyPlainValue * 25
? 'Encrypted Value = ' + str(MyEncValue)

and to bring it back:

MyCipherValue = 8 * 25
MyDecValue = MyCipherValue / 25
? 'Decrypted Value = ' + str(MyDecValue)

NOW THE APPROACH ABOVE IS REVERSIBLE, multiply by 25 and divide by 25.

Well PGP is different, and it is based on MATH.

2 person exchange PUBLIC keys and both keep their private keys secret.
then, if person A wants to send a string to person B, person A will ENCRYPT the
message with person B's PUBLIC key.

Take note of this, the ENCRYPTED TEXT cannot be opened by any ALGORITHM or
any key except person B's PRIVATE key.

Its quite good enough.

for info, you could download PGP at www.pgp.com.

IT IS OPEN SOURCE.

Have Fun!

-Mz

ENTIRE THREAD

refox - beating the encryption Posted by stevenm hmm @ 11/14/2003 9:05:01 PM
RE: refox - beating the encryption Posted by Eric den Doop @ 11/14/2003 9:25:44 PM
RE: refox - beating the encryption Posted by Karben Selim Mejia @ 11/14/2003 10:35:55 PM
RE: refox - beating the encryption Posted by Eric den Doop @ 11/15/2003 2:08:08 AM
RE: refox - beating the encryption Posted by Boudewijn Lutgerink @ 11/17/2003 12:48:59 PM
RE: refox - beating the encryption Posted by Bernard Bout @ 11/18/2003 6:13:50 AM
RE: refox - beating the encryption Posted by Boudewijn Lutgerink @ 11/18/2003 9:05:41 AM
RE: refox - beating the encryption Posted by Karben Selim Mejia @ 11/18/2003 2:55:33 PM
RE: refox - beating the encryption Posted by maximilian ali @ 11/19/2003 10:02:57 PM
RE: refox - beating the encryption Posted by Jamie Osborn @ 11/20/2003 1:08:49 AM
RE: refox - beating the encryption Posted by Boudewijn Lutgerink @ 11/20/2003 7:32:00 AM
RE: refox - beating the encryption Posted by Mz @ 11/21/2003 2:44:44 AM
RE: refox - DEFEAT REFOX Posted by maximilian ali @ 12/7/2003 8:20:43 PM
RE: refox - DEFEAT REFOX Posted by maximilian ali @ 12/7/2003 8:30:28 PM
RE: refox - beating the encryption with OBFUSCATOR Posted by Rene Relucio @ 12/8/2003 4:01:04 AM
RE: refox - beating the encryption Posted by qi seven @ 12/9/2003 1:43:30 AM
RE: refox - beating the encryption Posted by dm dm @ 12/10/2003 2:22:31 PM
RE: refox - beating the encryption Posted by Eric den Doop @ 12/10/2003 4:06:08 PM
The Encryption Technique there is REVERSIBLE! Posted by Mz @ 12/11/2003 2:37:07 AM
RE: The Encryption Technique there is REVERSIBLE! Posted by T├Ánis Pihlakas @ 12/11/2003 1:31:40 PM
RE: The Encryption Technique there is REVERSIBLE! Posted by Mz @ 12/12/2003 3:30:27 AM
RE: The Encryption Technique there is REVERSIBLE! Posted by Bernard Bout @ 12/12/2003 5:26:21 AM
RE: The Encryption Technique there is REVERSIBLE! Posted by Mz @ 12/12/2003 8:59:18 AM
RE: The Encryption Technique there is REVERSIBLE! Posted by khubaib khalid @ 12/12/2003 5:24:05 PM
OK... ;-) Posted by Mz @ 12/15/2003 4:21:12 AM
RE: refox - beating the encryption Posted by dm dm @ 12/14/2003 12:50:20 PM
RE: refox - beating the encryption Posted by Boudewijn Lutgerink @ 12/16/2003 11:15:48 AM
RE: refox - beating the encryption Posted by dm dm @ 12/16/2003 12:24:22 PM