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gerrit-public.fairphone.software / platform / external / ImageMagick / af8d6655e12345c48d687558c0665070d206a942 / . / www / cipher.html
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]8 <title>ImageMagick: Encipher or Decipher an Image</title>
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187
188<div class="main">
189
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]190<h1>Enciphering and Deciphering Images</h2>
191<p class="navigation-index">[<a href="#encipher">Encipher an Image</a> &bull; <a href="#decipher">Decipher an Image</a> &bull; <a href="#caveats">Encipher and Decipher Caveats</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]192
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]193<div class="doc-section">
194
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]195<p>Most images, by design, are made to be viewed often and by many people. Web images, for example, may be viewed hundreds of times a day by a multitude of web vistors. However, in some cases, you may want to keep a particular image private so that only you or perhaps a select group of your friends or web visitors can view it. ImageMagick permits you to scramble your images such that unless someone knows your passphrase, they will be unable to view the original content.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196
197<p>You could use an <a href="http://www.wizards-toolkit.org/www/encipher.html">enciphering</a> utility to scramble your image but they typically scramble the entire file making it unrecognizable as an image format. With ImageMagick, only the pixels are scrambled. The scrambled image continues to be recognized as an image and will even display in your web page. However, the content appears as gibberish, nothing like the original content.</p>
198
199</div>
200
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]201<h2><a id="encipher"></a>Encipher an Image</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]202<div class="doc-section">
203
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]204<p>Use the <a href="../www/command-line-options.html#encipher">-encipher</a> option to scramble your image so that it is unrecognizable. The option requires a filename that contains your passphrase. In this example we scramble an image and save it in the PNG format:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]205
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]206<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert rose.jpg -encipher passphrase.txt rose.png</span></p>
207<p>Here we encipher an image using another image as the passphrase:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208
209<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert rose.jpg -encipher smiley.gif rose.png</span></p>
210</div>
211
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]212<h2><a id="decipher"></a>Decipher an Image</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]213<div class="doc-section">
214
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]215<p>Use the <a href="../www/command-line-options.html#decipher">-decipher</a> option to unscramble your image so that it is recognizable once again. The option requires a filename that contains your passphrase. In this example we unscramble an image and save it in the JPEG format:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]216
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]217<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert rose.png -decipher passphrase.txt rose.jpg</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218</div>
219
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]220<h2><a id="caveats"></a>Encipher and Decipher Caveats</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]221<div class="doc-section">
222
cristyd0bda5e2010-09-21 16:22:45 +0000[diff] [blame]223<p>Some formats do not support enciphered pixels-- the JPEG or GIF format, for
224example. To ensure your image format is supported, encipher a test image and
225verify you can restore its original content <em>before</em> you encipher any
226additional images in that format.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]227
cristyd0bda5e2010-09-21 16:22:45 +0000[diff] [blame]228<p>The image format also should be 8-bit and RGB (TrueColor). As such you may
229like to include the options "-depth 8 -type TrueColor" before the output
230filename. </p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]231
cristyd0bda5e2010-09-21 16:22:45 +0000[diff] [blame]232<p>The passphrase can be any combinations of letters and symbols. It should
233be a minimum of 12 character combinations to help ensure your image remains
234private. Also make sure your passphrase file permissions prevent others from
235reading it otherwise unintended users may be able to view the original image
236content.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]237
cristyd0bda5e2010-09-21 16:22:45 +0000[diff] [blame]238<p>You can only restore the original image content if you know your
239passphrase. If you lose or forget it, your original image content is lost
240forever.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]241
cristyd0bda5e2010-09-21 16:22:45 +0000[diff] [blame]242<p>ImageMagick only scrambles the image pixels. The image metadata remains
243untouched and readable by anyone with access to the image file.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244
cristyd0bda5e2010-09-21 16:22:45 +0000[diff] [blame]245<p>ImageMagick uses the <a
246href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard">AES</a>
247cipher in cipher feedback mode. We use the passphrase to derive the cipher
248key and the required nonce.</p>
249
250<p>Currently only ImageMagick can restore your enciphered image content. We
251use a standard cipher and mode so other vendors are encouraged to support
252enciphered image content.</p>
253
254<p>Some small practical examples of image enciphering can be found in IM
255Examples <A HREF="http://www.imagemagick.org/Usage/transform/#encipher"
256>Encrypting Image Data</A>. </p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]257
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