JPHS for Windows 0.5

  • Last update: 31 Oct 2005
  • License: Freeware
  • Size: 180KB
  • Downloads: 26188

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.

The program use a cryptograpic algoritm "Blowfish" as the basis of pseudorandom number generator. The key is derived from your pass phrase. This routine produces the same random numbers in the same sequence only when the key is the same, i.e. the same pass phrase. The random numbers are used to decide where the hidden data is stored within picture information. The result is effect that random noise is added to the visual information.

Rating: 5 3 (votes) Comments:

dude, you just need to be smart about it. For one, it will unpack a second archive inside the initial archive. It was only used for email transmission, hence the .zip.sig that you see. Inside the second archive is the actual program. try extracting the files to different directories to eliminate any overlap. The program itself is pretty self explanitory meaning Im not going in to it.

  • Rating: 5
  • Posted by: x3r0kool
  • Date: 7 Oct 2008

This is more of a question then a comment. Which type of program opens this file to read after.

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