Lines Matching full:passphrase
61 <p class="lead magick-description">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>
67 <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>
70 convert rose.jpg -encipher passphrase.txt rose.png
73 <p>Here we encipher an image using another image as the passphrase:</p>
81 <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>
84 convert rose.png -decipher passphrase.txt rose.jpg
98 <p>The passphrase can be any combinations of letters and symbols. It should
100 private. Also make sure your passphrase file permissions prevent others from
105 passphrase. If you lose or forget it, your original image content is lost
113 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>
