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JScript.Encode

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JScript.Encode is a method created by Microsoft used to encode both server and Client-side JavaScript or VB Script source code in order to protect the source code from copying.[1] JavaScript code is used for creating dynamic web content on many websites, with the source code easily viewable, so this was meant to protect the code.

The encoding is a simple polyalphabetic substitution using three alphabets.

How to use

You can use a command line script encoder [1] to encode your scripts. To encode a HTML web-page file called default.htm, use the following command: 

screnc.exe default.htm defaultenc.htm

It would output to a file called defaultenc.htm.

Weaknesses

It has been reverse engineered [2] and many websites provide an on-the-fly decoder.[3]

References

  1. ^ Script Encoding with the Microsoft Script Engine Version 5.0
  2. ^ Breaking the Windows Script Decoder
  3. ^ Windows Script Decoder


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