stego is a free source program, that you can use free in the terms of the GPL (General Purpose License).

stego is an utility for steganography, that is, let you sending secrets messages. For example in stg.txt you can't see nothing strange except that text is justified.

Let's find the secret message:

stego -d -tj --stg stg.txt --msg msg.txt --pass

Then type the password: enigma
Now you have the message in msg.txt

Downloads:

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Downloads

notes:

• dont use -t option, use instead -tj
• stego can use IDEA in CFB-8 mode to encript messages, so use --pass option to avoid Big Brother (aka NSA) from reading you
• stego is in a prealfa state, so you can find a lot of bugs
• to compile stego you need version 03.12.27 of ftk library