![]() ![]() Outsiders with access to the original file could easily see that there’s hidden data inside – and that counters the concept of undetectability. However, the file in question could grow in size: For example, hiding a 1 Mbyte document inside a 5 Mbyte audio file increases its total size significantly. ![]() The obvious upside is that the modified file wouldn’t be distinguishable from the original. Alternatively, since every file has a pre-defined “End of file here” mark, secret messages could simply be attached after the “official” end of the file. Adding bits to a file: Hidden message could appear in the “file header”, which usually contains information such as the file type or, in the case of JPG images, the resolution and color depth of the photo. There are basically two popular approaches:ġ. The fact that it’s not widely used and is very hard to “crack” makes it even more appealing, and therefore a pretty good method of transmitting extremely sensitive personal or business information through e-mail, over the Web, or through social channels such as Twitter or Facebook. Today’s digital steganography works by adding secret bits (or replacing bits) in files, such as photos or audio files, with secret data. Fortunately for all of us, steganography has gotten a lot easier to achieve and a lot harder to reveal: Enter digital steganography. The moment the tablet reached its destination, the wax was melted to reveal the hidden message. Since wax tablets were popular reusable writing surfaces, the Greeks would simply carve an inconspicuous message into the wax and pass the tablet along. In Greece, people wrote secret messages on plain wood tablets and covered it with wax. ![]() Image credit: mrpeanutįor example, during World War II, the French Résistance used invisible ink on couriers’ backs to send messages between Résistance cells. During important historic events of our past, steganography was often used to trade personal secrets, plan covert operations and send political espionage information. The word steganography itself originated in Greece and means “covered writing”. Hiding secret messages inside what seem to be harmless messages is nothing new. ![]()
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