http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
- <meta name="google-site-verification" content="MxsMq6bdLOx0KSuz1MY6yG9ZTIJ7_7DVRfl5NCAT5Yg"/>
+ <meta name=viewport content="width=device-width, initial-scale=0.3333334">
+ <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4"/>
<title>ImageMagick: Encipher or Decipher an Image</title>
<meta http-equiv="content-language" content="en-US"/>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta http-equiv="reply-to" content="magick-users@imagemagick.org"/>
<meta name="application-name" content="ImageMagick"/>
- <meta name="description" content="Use ImageMagick to convert, edit, or compose bitmap images in a variety of formats. In addition resize, rotate, shear, distort and transform images automagically."/>
+ <meta name="description" content="A collection of tools and libraries to read, write, and manipulate an image in any of the more popular image formats."/>
<meta name="application-url" content="http://www.imagemagick.org"/>
<meta name="generator" content="PHP"/>
- <meta name="keywords" content="encipher, or, decipher, an, image, ImageMagick, PerlMagick, image processing, OpenMP, software development library, image, photo, software, Magick++, MagickWand"/>
+ <meta name="keywords" content="encipher, or, decipher, an, image, convert, edit, compose, image, pixel"/>
<meta name="rating" content="GENERAL"/>
<meta name="robots" content="INDEX, FOLLOW"/>
<meta name="generator" content="ImageMagick Studio LLC"/>
<meta name="copyright" content="Copyright (c) 1999-2012 ImageMagick Studio LLC"/>
<meta name="distribution" content="Global"/>
<link rel="icon" href="../images/wand.png"/>
- <link rel="shortcut icon" href="../images/wand.ico" type="images/x-icon"/>
+ <link rel="shortcut icon" href="../images/wand.ico" type="images/x-icon"/>
<link rel="canonical" href="http://www.imagemagick.org" />
<link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
+
<!-- Add jQuery library -->
- <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
+ <script type="text/javascript" src="http://localhost/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
- <!-- Optionaly include easing and/or mousewheel plugins -->
- <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.easing-1.3.pack.js"></script>
- <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.mousewheel-3.0.6.pack.js"></script>
+ <!-- Add mousewheel plugin (this is optional) -->
+ <script type="text/javascript" src="http://www.imagemagick.org/fancybox/lib/jquery.mousewheel-3.0.6.pack.js"></script>
<!-- Add fancyBox -->
- <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/jquery.fancybox.css?v=2.0.4" type="text/css" media="screen" />
- <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.fancybox.pack.js?v=2.0.4"></script>
+ <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/source/jquery.fancybox.css?v=2.1.5" type="text/css" media="screen" />
+ <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/jquery.fancybox.pack.js?v=2.1.5"></script>
+
+ <!-- Optionally add helpers - button, thumbnail and/or media -->
+ <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-buttons.css?v=1.0.5" type="text/css" media="screen" />
+ <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-buttons.js?v=1.0.5"></script>
+ <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-media.js?v=1.0.6"></script>
- <!-- Optionaly include button and/or thumbnail helpers -->
- <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-buttons.css?v=2.0.4" type="text/css" media="screen" />
- <script type="text/javascript" src="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-buttons.js?v=2.0.4"></script>
+ <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-thumbs.css?v=1.0.7" type="text/css" media="screen" />
+ <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-thumbs.js?v=1.0.7"></script>
- <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-thumbs.css?v=2.0.4" type="text/css" media="screen" />
- <script type="text/javascript" src="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-thumbs.js?v=2.0.4"></script>
<script type="text/javascript">
$(document).ready(function() {
$(".fancybox").fancybox();
});
</script>
+
<!-- ImageMagick style -->
- <link rel="stylesheet" href="http://www.google.com/cse/style/look/default.css" type="text/css" />
<style type="text/css" media="all">
@import url("../www/magick.css");
</style>
</head>
<body id="www-imagemagick-org">
+
+<script type="text/javascript">
+ (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+ m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+ })(window,document,'offline-script','//www.google-analytics.com/analytics.js','ga');
+
+ ga('create', 'UA-40133312-1', 'imagemagick.org');
+ ga('send', 'pageview');
+</script>
+
<div class="titlebar">
<div style="margin: 17px auto; float: left;">
<script type="text/javascript">
//-->
</script>
<script type="text/javascript"
- src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
+ src="http://localhost/pagead/show_ads.js">
</script>
</div>
<a href="../discourse-server">
<img src="../images/logo.jpg"
- alt="ImageMagick Logo"
+ alt="ImageMagick Logo" width="123" height="118"
style="width: 123px; height: 118px; border: 0px; float: right;" /></a>
-<a href="../index.html">
+<a href="http://www.imagemagick.org/ImageMagick-7.0.0/index.html">
<img src="../images/sprite.jpg"
- alt="ImageMagick Sprite"
+ alt="ImageMagick Sprite" width="114" height="118"
style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
</div>
<div class="westbar">
<div class="menu">
- <a title="About ImageMagick" href="../index.html">About ImageMagick</a>
+ <a title="About ImageMagick" href="http://www.imagemagick.org/ImageMagick-7.0.0/index.html">About ImageMagick</a>
</div>
<div class="menu">
<a title="Binary Releases" href="binary-releases.html">Binary Releases</a>
<a title="Site Map: Links" href="links.html">Links</a>
</div>
<div class="sep"></div>
-<div class="menu">
- <a rel="follow" title="Sponsors" href="sponsors.html">Sponsors:</a>
-
- <a href="http://www.networkredux.com"> <img src="../images/networkredux.png" width="140" height="31" alt="[sponsor]" style="margin-top: 4px; margin-left: 4px; border: 0px; float: left;" /></a>
- <a href="http://www.dinodirect.com/ipads-tablets/"> <img src="../images/dino-direct.jpg" width="140" height="90" alt="[sponsor]" style="margin-top: 4px; margin-left: 4px; border: 0px; float: left;" /></a><!-- 201208010120 mickey@163... -->
-<div class="sponsbox">
-<div class="sponsor">
- <a rel="follow" title="Sponsor: The Fastest & Easiest Way to Find Images" href="http://www.graphicsfactory.com">The Fastest & Easiest Way to Find Images</a><!-- 201210010270 graphicsfac... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: VPS" href="http://www.interdominios.com/vps">VPS</a><!-- 201209010090 barsh@inter... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Werbebanner Werbeplane" href="http://www.allesbanner.de">Werbebanner Werbeplane</a><!-- 201212010450 info@druck... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Entertainment News & Photos" href="http://www.zimbio.com">Entertainment News & Photos</a><!-- 201211010540 bd@zimb... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: LED24" href="http://led24.de/">LED24</a><!-- 201207010270 info@led24... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Best Website Hosting" href="http://www.top-cheap-web-hosting.com">Best Website Hosting</a><!-- 201304010090 eunge.liu-->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Android Tablet" href="http://www.dinodirect.com/ipads-tablets/">Android Tablet</a><!-- 201208010120 mickey@163... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Web Site Hosting" href="http://webhostinggeeks.com">Web Site Hosting</a><!-- 201302010900 funds@enmob... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Premium Quality Stock Photos" href="http://www.f1online.pro/en/">Premium Quality Stock Photos</a><!-- 2012080100540 ... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 2012070100250 ... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Managed Server" href="http://www.robhost.de">Managed Server</a><!-- 201210010720 klikics... -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201303011500 r.leo -->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Notebook Reparatur" href="http://www.notebook-reparaturen-berlin.de">Notebook Reparatur</a><!-- 2012080100300 atlas-multimedia-->
-</div>
-<div class="sponsor">
- <a rel="follow" title="Sponsor: Web Hosting" href="http://www.hostucan.com">Web Hosting</a><!-- 2012120100150 racent marketing@webhosting...-->
-</div>
-</div>
-</div>
</div>
<div class="eastbar">
- <div class="g-plusone" id="gplusone"></div>
<script type="text/javascript">
+ /* <![CDATA[ */
window.___gcfg = {
lang: 'en-US'
};
(function() {
- var po = document.createElement('script');
- po.type = 'text/javascript'; po.async = true;
+ var po = document.createElement('offline-script');
+ po.type = 'text/javascript';
+ po.async = true;
po.src = 'https://apis.google.com/js/plusone.js';
- var script = document.getElementsByTagName('script')[0];
+ var script = document.getElementsByTagName('offline-script')[0];
script.parentNode.insertBefore(po, script);
})();
var gplusone = document.getElementById("gplusone");
gplusone.setAttribute("data-size","medium");
- gplusone.setAttribute("data-count","false");
+ gplusone.setAttribute("data-count","true");
+ /* ]]> */
+ </script>
+ <script type="text/javascript">
+ /* <![CDATA[ */
+ (function() {
+ var po = document.createElement('offline-script'), t = document.getElementsByTagName('offline-script')[0];
+ po.type = 'text/javascript';
+ po.async = true;
+ po.src = 'http://api.flattr.com/js/0.6/load.js?mode=auto';
+ var script = document.getElementsByTagName('offline-script')[0];
+ script.parentNode.insertBefore(po, script);
+ })();
+ /* ]]> */
</script>
+ <div> <a class="FlattrButton" style="display:none;" rev="flattr;button:compact;" href="http://www.imagemagick.org/"></a></div>
+ <noscript>
+ <a href="http://flattr.com/thing/947300/Convert-Edit-And-Compose-Images" target="_blank">
+ <img src="http://api.flattr.com/button/flattr-badge-large.png" alt="Flattr this" title="Flattr this" width="93" height="20" border="0" /></a>
+ </noscript>
+ <div class="g-plusone" data-size="standard" data-count="true"></div>
</div>
<div class="main">
<h1>Enciphering and Deciphering Images</h1>
-<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>
+<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>
<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"> $ </span><span class='crtin'>convert rose.jpg -encipher passphrase.txt rose.png</span></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>
-<p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>convert rose.jpg -encipher smiley.gif rose.png</span></p>
+<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose.jpg -encipher smiley.gif rose.png</span></p>
</div>
<h2><a id="decipher"></a>Decipher an Image</h2>
<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"> $ </span><span class='crtin'>convert rose.png -decipher passphrase.txt rose.jpg</span></p>
+<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose.png -decipher passphrase.txt rose.jpg</span></p>
</div>
<h2><a id="caveats"></a>Encipher and Decipher Caveats</h2>
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"
</div>
<div id="linkbar">
- <span id="linkbar-west"> </span>
+ <span id="linkbar-west"> </span>
+
<span id="linkbar-center">
- <a href="../discourse-server">Discourse Server</a> •
- <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
+ <a href="../discourse-server">Discourse Server</a> •
+ <a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> •
+ <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a> •
+ <a href="http://jqmagick.imagemagick.org/">JqMagick</a>
</span>
- <span id="linkbar-east"> </span>
- </div>
- <div class="footer">
- <span id="footer-west">© 1999-2012 ImageMagick Studio LLC</span>
- <span id="footer-east"> <a href="contact.html">Contact the Wizards</a></span>
- </div>
- <div style="clear: both; margin: 0; width: 100%; "></div>
- <script type="text/javascript">
- var _gaq = _gaq || [];
- _gaq.push(['_setAccount', 'UA-17690367-1']);
- _gaq.push(['_trackPageview']);
-
- (function() {
- var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
- ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
- var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
- })();
- </script>
+ <span id="linkbar-east"> </span>
+</div>
+<div class="footer">
+ <span id="footer-west">© 1999-2015 ImageMagick Studio LLC</span>
+ <span id="footer-east"> <a href="contact.html">Contact the Wizards</a></span>
+</div>
+<div style="clear: both; margin: 0; width: 100%; "></div>
</body>
</html>
projects / imagemagick / blobdiff