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<h1>Enciphering and Deciphering Images</h1>
-<p class="navigation-index">[<a href="#encipher">Encipher an Image</a> • <a href="#decipher">Decipher an Image</a> • <a href="#caveats">Encipher and Decipher Caveats</a>]</p>
+<p class="navigation-index">[<a href="cipher.html#encipher">Encipher an Image</a> • <a href="cipher.html#decipher">Decipher an Image</a> • <a href="cipher.html#caveats">Encipher and Decipher Caveats</a>]</p>
<div class="doc-section">
-<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>
+<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 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>
<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>
<h2><a id="encipher"></a>Encipher an Image</h2>
<div class="doc-section">
-<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>
+<p>Use the <a href="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>
<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose.jpg -encipher passphrase.txt rose.png</span></p>
<p>Here we encipher an image using another image as the passphrase:</p>
<h2><a id="decipher"></a>Decipher an Image</h2>
<div class="doc-section">
-<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>
+<p>Use the <a href="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>
<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose.png -decipher passphrase.txt rose.jpg</span></p>
</div>
verify you can restore its original content <em>before</em> you encipher any
additional images in that format.</p>
-<p>The image format also should be 8-bit and RGB (TrueColor). As such you may
+<p>The image format may only support 8-bit and RGB (TrueColor). As such you may
like to include the options "-depth 8 -type TrueColor" before the output
-filename. </p>
+filename.</p>
<p>The passphrase can be any combinations of letters and symbols. It should
be a minimum of 12 character combinations to help ensure your image remains
<p>ImageMagick uses the <a
href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard">AES</a>
-cipher in cipher feedback mode. We use the passphrase to derive the cipher
-key and the required nonce.</p>
+cipher in Counter mode. We use the the first half of your passphrase to derive the nonce. The second half is the cipher key. When used correctly, AES-CTR provides a high level of confidentiality. To avoid information leaks, you must use a fresh passphrase for each image your encrypt.</p>
<p>Currently only ImageMagick can restore your enciphered image content. We
-use a standard cipher and mode so other vendors are encouraged to support
-enciphered image content.</p>
+use a standard cipher and mode so other vendors are could support enciphered image content.</p>
<p>Some small practical examples of image enciphering can be found in IM
Examples <a href="http://www.imagemagick.org/Usage/transform/#encipher"
>Encrypting Image Data</a>. </p>
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projects / imagemagick / blobdiff