Crypt::Image - Interface to hide text into an image.
It requires key image and a text message to start with. The text message is scattered through out the image and gaps are filled with random trash.RGB is used to hide the text message well from any algorithm that searches for similarities between 2 or more images which are generated by the same key.The UTF char code is randomly distributed between the R, G and B, which then gets added / substracted from the original RGB. So even if the same key image is used to encrypt the same text, it will look different from previously encrypted images and actual data pixels are unrecognizable from trash data,which also changes randomly every time.
The constructor takes at the least the location key image,currently only supports PNG format. Make sure your key image is not TOO BIG. Please refer to the image key.png supplied with the package tar ball to give you a start.
use strict; use warnings; use Crypt::Image; my $crypter = Crypt::Image->new(file => 'your_key_image.png');
Encrypts the key image (of type PNG currently) with the given text and save it as the new image by the given file name. The length of the given text depends on height and width of the key image given in the constructor.It should not be longer than (width*height)-2.
use strict; use warnings; use Crypt::Image; my $crypter = Crypt::Image->new(file => 'your_key_image.png'); $crypter->encrypt('Hello World', 'your_new_encrypted_image.png');
Decrypts the given encrypted image and returns the hidden text.
use strict; use warnings; use Crypt::Image; my $crypter = Crypt::Image->new(file => 'your_key_image.png'); $crypter->encrypt('Hello World', 'your_new_encrypted_image.png'); print "Text: [" . $crypter->decrypt('your_new_encrypted_image.png') . "]\n";
Mohammad S Anwar,
<mohammad.anwar at yahoo.com>
Please report any bugs / feature requests to
bug-crypt-image at rt.cpan.org or through the the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Crypt-Image. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
You can find documentation for this module with the perldoc command.
You can also look for information at:
Joonas Vali, author of the blog gave me the idea for this module.
Copyright 2011 - 2014 Mohammad S Anwar.
This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:
Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License.By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license.
If your Modified Version has been derived from a Modified Version made by someone other than you,you are nevertheless required to ensure that your Modified Version complies with the requirements of this license.
This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder.
This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement,then this Artistic License to you shall terminate on the date that such litigation is filed.
Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.