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HIP (Hide In Picture) is a program that allows you to "hide" files inside bitmaps (.bmp files), and protecting it with a password. The pictures look like normal images, so no one will suspect there is hidden data in them. This technique is known as steganography. You can use a normal cryptography program to protect secret data from other people, but then, even if they aren't able to read it, they will be able to see you are hiding something. With HIP, you can hide your secret data inside an innocent family photograph or even your Windows background, and nobody will ever suspect it.
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JPHIDE and JPSEEK are programs which allow you to hide a file in a jpeg visual image. There are lots of versions of similar programs available on the internet but JPHIDE and JPSEEK are rather special. The design objective was not simply to hide a file but rather to do this in such a way that it is impossible to prove that the host file contains a hidden file. Given a typical visual image, a low insertion rate (under 5%) and the absence of the original file, it is not possible to conclude with any worthwhile certainty that the host file contains inserted data. As the insertion percentage increases the statistical nature of the jpeg coefficients differs from "normal" to the extent that it raises suspicion. Above 15% the effects begin to become visible to the naked eye. Of course some images are much better than others when used a host file - plenty of fine detail is good. A cloudless blue sky over a snow covered ski paradise is bad. A waterfall in a forest is probably ideal.
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