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This steganography software inserts data in the image file in a random way depending on a key (which is also used to encrypt the data), and changes other bits of the image file to compensate for the modifications induced by the hidden data so as to avoid modifying statistical properties of the image file. It is thus more secure than most steganography programs.
Stego PNG has a simple user interface and is easy to use. Here is a typical screenshot, after hiding a file:
The original and stego images will be displayed after the hiding operation if the checkbox for this is checked.
You can toggle between green and gray by double-clicking on any part of the window which is not a control.
Good candidates for container files are graphics images, since it is possible to make small changes to the bytes specifying pixel color values in such a way that the "stego" image (containing the hidden data) does not look any different from the original image (the one which does not contain the hidden data).
Stego PNG allows you to hide a file of any type in a PNG or a BMP image file, with the use of a user-specified stego key (an encryption key), so that (i) the presence of the hidden file is undetectable (even by forensic software using statistical methods) and (ii) that data can be extracted only by someone who knows that stego key.
A stego image (that is, an image containing hidden data) can be displayed in a web page (from where it can be saved by any viewer to disk) or sent to another person as an email attachment. If one simply wishes to hide sensitive data (such as a file containing passwords, bank account details, etc.) on one's computer, there are normally plenty of BMP files to be found there, and often also plenty of PNG images from web pages which have been saved. (Note that not all web browsers can display all PNG images correctly; Firefox, Chrome and Opera can, but Internet Explorer up to Version 8 cannot.)
Two more uses for Stego PNG are: (i) To add a 'watermark' to an image file. (ii) To transport sensitive data (e.g., information in an Excel spreadsheet) without detection. You can hide the data in a PNG or BMP image and put that image on a memory stick (a.k.a. flash drive or pen drive); having safely reached your destination you can then extract the data from the image.
A BMP file containing a particular image is significantly larger than the PNG file containing the same image. For this reason BMP files are not normally included in web pages (which usually have GIF, JPG or PNG images). If sending an image file as an email attachment the file can first be ZIPped up to reduce its size.
Stego PNG differs from some or all other steganograpy software in two respects: (i) A stego/encryption key is required to ensure that only someone who knows the key can extract data hidden with the use of that key. (ii) The bits of the data are inserted into the bytes of the image files randomly (based on the stego key) and in such a way as to defeat the use of statistical tests to reveal the presence of hidden data.
Stego PNG User Manual
Trial version: A copy of the Stego PNG installation program is available for free download from this website for the purpose of installing a trial version for evaluation. Click on the following link for further information:
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Updates: Purchasers of a user license for this software are entitled to an update to any later version at no additional cost.