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steg-encode.pl is a basic tool for hiding secret messages in images. It comes with a friend: steg-decode.pl.

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Usage Example

To hide a message in an image, use the following syntax.

steg-encode.pl image message output

Output should be to either an uncompressed image file or a non-lossy compressed image file, and should be 24-bit colour. Formats such as PNG or Windows Bitmap are ideal.

An example is:

steg-encode.pl test-in.png test-in.txt test-out.png

To convert back:

steg-decode.pl image output

And to…"