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So cryptography is the idea of encrypting a message so that although everyone knows the message has been sent they cant actually find out what it means. Whereas in steganography were trying to hide the fact that weve sent a message at all. So a classic example would be if i was writing you a letter and then I wrote in invisible ink a whole different letter between the lines or on the other side or something like that And only you knew that that was going to be there. So you get home and everyone else maybe looks at the letter and thinks its not very interesting at all. And then of course you can uncover the secret message. Today well talk a bit about digital image steganography because obviously theres a huge scope for hiding things in digital images: Images can be megabytes or more and you can hide files of megabytes or more in them. But of course as the the amount of steganography in images increase, so is the attempts to try and find it. So theres lots of statistical a