SilentEye is a free program that uses the Steganography technique to hide messages or files into regular images or audio media files. The program is easy to use, to create a new file you just have to drag and drop the container media file into the main window and use the "Encode" option, which will allow you to write a text message or select a file to hide (container file formats supported: png, jpg, jpeg, bmp, tiff, tif, and wav).
You can adjust different parameters for the container files: for images you can adjust the luminance, and image quality; for audio files you can adjust the sound quality, number of channels, header position, and more. You can also enable encryption and data compression. One thing to bring the attention to is that the container file must have enough space to encode your message or file. In other words, the bigger the container file, the more space available for the text message or file you want to hide.
Recovering a hidden text message or file involves a similar procedure; you need to drag and drop the media file to decode, and use the "Decode" option. Additionally, when installing the program you can associate both image and audio files to be automatically opened with SilentEye.
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