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.

Contents

[edit] 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.

[edit] Weaknesses

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

[edit] References

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

[edit] External links

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