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Visual Basic / Encryption / Simple Cyptography

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Added: 2002-08-19

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Simple cryptography
Note: I mean simple. These codes are easily cracked!

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Declarations
Highlight All'Install a bit of security to your applications. This simple 'encryption function can serve as both the encoder and 'decoder. In order for this to work properly, you must use 'the same numerical key each time. 'For example, ' ' lets say you have a string, SecretPassword, that is equal ' to 'the toolbox', and you wish to encrypt it. ' ' Call the following: ' ' SecretPassword = Encrypt(SecretPassword, 80) ' 'In this case you are using an encryption key of 80. So, 'the end result would give you a value of '$85p$??<2?( '. in order to decode it, simply reverse the process, but be 'sure to use the right key!. in real world applications, you 'might want to create keys on the fly using a math algorithm 'and the len statement as a known base, such as: Dim Key As Integer Key = (Int(Sqr(Len(SecretPassword) * 95)) + 21) 'For the string SecretPassword = "the toolbox", a key of 53 'would be generated using the algorithm above. 'To get real sneaky, you can play around with this code all you 'want, but this is only a start! 'Here is the magic code to do the encryption. If you'll notice, it is the same encryption code used in the 'screen saver template.
Code
Highlight AllFunction Encrypt (Text As String, EncryptKey As Integer) Dim Temp As String, RR As Integer For RR = 1 To Len(Text) Temp$ = Temp$ + Chr$(Asc(Mid(Text, RR, 1)) Xor EncryptKey) Next RR Encrypt = Temp End Function'

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