1. Hello Guest! You are browsing the forums as a guest; you will have limited permissions as a guest so we advise registering to enjoy the forums fully. Remember: we are a Christian ONLY site - any user who is not Christian will not be approved. Blessings, Christian Forum Site Staff
    Dismiss Notice

pictures

Discussion in 'Technology and Internet' started by violet, Aug 19, 2007.

  1. pictures

    Have you ever heard of encrypted text in a photo?
    I have opened some TIF and JPEG files with Wordpad and discovered hidden text in there. I came across it by accident~
     
  2. Yes....its called steganography...

    http://en.wikipedia.org/wiki/Steganography

    One of the bigger concerns is the spread of viruses and worms this way through file attachments.

    One little trick I did one time was to place a text message within a .wav file (sound file)
     
  3. Really? How did you do this? I have found some stuff in those too!
     
  4. Pre-reverse-encription IIRC. Use a reversible algorithm to make some encrypted null text transform into readable strings. Since it's encrypted, a portion of it tells the graphic/sound file to skip the section, or on more modern methods, the software does it automatically. Similar to the DRM signing the is done on iTunes and Zune and other systems, except it ensures the the binary data is reverse-encrytped.

    So if I feed "I love you" into an encryption, I'm likely to end up with some random garbage. For instance, in md5 encryption, "I love you" is "e4f58a805a6e1fd0f6bef58c86f9ceb3" in Hex, but might show up in any number of other ways using various encryption methods. Since md6 uses base16, you find an encryption method that uses base26, or better base128.

    While most logical things would equal something insane that looks like the gibberish you see in most files, SOMETHING mathmatically would equal "I love you". Find that snippet of text using a hash table, and insert it into an already encrypted file, and you got a file that now contains the text you want.
     
  5. Violet - I believe that I mentioned early on that my PC network security disallows all Internet audio, video and graphics. It is specifically for that reason that you mentioned and I would strongly recommend that your anti-virus software updates be done expeditiously as well as keeping your hardware or software firewall up to date.
     

Share This Page