[MacPorts] #31723: add Gifshuffle

[MacPorts]

#31723: add Gifshuffle
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 Reporter:  fyodor.vassiley@…             |       Owner:  macports-tickets@…                   
     Type:  request                       |      Status:  new                                  
 Priority:  Low                           |   Milestone:                                       
Component:  ports                         |     Version:  2.0.3                                
 Keywords:  Gifshuffle steganography ceh  |        Port:                                       
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 GIF colourmap steganography

 The program gifshuffle is used to conceal messages in GIF images by
 shuffling the colourmap, which leaves the image visibly unchanged.
 gifshuffle works with all GIF images, including those with transparency
 and animation, and in addition provides compression and encryption of the
 concealed message.

 As of 21 January 2003, this site contains gifshuffle 2.0. This is the
 first update in nearly five years! Changes involve tweaks to a few GIF
 encoding characteristics, plus an improvement to the way encrypted
 messages are encoded. These should further reduce the chances of concealed
 messages being detected.
 How does it work?

 Any list of n items can be sorted n! ways, meaning that any particular
 ordering can represent a number in the range [0, n!-1]. This number can in
 turn store approximately log2(n!) bits of information. Thus, a GIF image
 with 256 colours can store up to 1683 bits (210 bytes) of information by
 shuffling the colours in its colourmap.
 It's free!

 The gifshuffle program is public domain, and source code can be downloaded
 from this page. There are no patents or copyrights, so its use is
 unrestricted. Naturally, if you do decide to use it, the author would love
 to hear about it.

 http://www.darkside.com.au/gifshuffle/

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Ticket URL: <https://trac.macports.org/ticket/31723>
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