A covert channel is a means of communication that is non-standard. In other words, messages sent by other than normal means (more here). One method (vector) used as a covert channel is steganography. Steganography is a means to hide messages, usually within images like JPEGs, as opposed to cryptography where messages are encrypted. Over at Daily Cup of Tech (great site by the way, worth a good dig through the articles) they’ve posted a video which details how to use a compression tool and a built in Windows command line utility (FINALLY, a real use for cmd and it should work with GNU/Linux tools too) actually embed files into JPEG or other image files. While not strictly speaking steganography (which only deals with messages, not entire files), this is just too cool! Can’t wait to try this one out on my own!!!

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This entry was posted on Wednesday, July 25th, 2007 at 7:31 pm and is filed under Graphics, Neatorific, Security, Software, Tip, Windows. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.