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1. #HOW TO REVEAL HIDDEN MESSAGES IN IMAGE FILES SOFTWARE#
2. #HOW TO REVEAL HIDDEN MESSAGES IN IMAGE FILES CODE#

This is due the large file size and high quality. The best type of image file to hide information inside of is a 24 bit Bitmap. This keeps the message from being easily detected. By altering that last bit, there will be relatively no change to the color of that pixel within the carrier image. This simply means that the hidden message will alter the last bit of a byte in a picture. The most effective method for this type of steganography is normally the least significant bit method. These purposes can include authentication, concealing of messages, and transmission of encryption keys. This type of steganography is very effective against discovery and can serve a variety of purposes.

#HOW TO REVEAL HIDDEN MESSAGES IN IMAGE FILES SOFTWARE#

Here is an opensouce Steganography software called steganotool This project is an open source steganography tool that can be used to hide and extract text to/ from Bitmap images. With that we can hide messages in not just images but also in audio,vedeo and other formats. Hey that method is called as Steganography. Of course the same technique can be used with color photos: change the last bit in each of the RGB components to encode 3 bits per pixel, etc.

Depending on how much degradation in quality you think you can get away with, you could use 2 bits per byte, or just change 1 bit in every other byte, etc. Of course nothing says you have to use 1 bit per byte for the secret message. Even if they did notice, unless they had a reason to be suspicious, they would likely just conclude that the picture was of less-than-perfect quality. The changes to the colors would be so subtle that it's unlikely that anyone looking at the picture would notice. You end up with the coded 8 bytes being 00 01 C9 FE FF C9 43 43. It's already 1, so that makes no difference. You change the last bit of the third byte to 1. You change the last bit of the second byte to 1, changing the byte from 00 to 01. So you change the last bit of the first byte to 0, changing the byte from 01 to 00.

#HOW TO REVEAL HIDDEN MESSAGES IN IMAGE FILES CODE#

Your message begins with the letter "C", ascii code 0110 0111. Set the last bit of each pallette index number to successive bits of your message.įor example, suppose the first eight pixels of the original photo are, say, 01 00 C9 FF FF C8 42 43. Break your secret message into individual bits.

Then you take an ordinary, real photograph. So in this case we could say pallette #0=RGB(0,0,0), pallette #1=RGB(1,1,1). I'm not sure how much you know about graphic file formats, but in GIF you have one byte per pixel, with each possible byte value mapping to some specific color. So to take a simple example, suppose you had a gray-scale GIF image where the pallette is arranged in order from white to black with a smooth range of grays in between. In a photograph, minor variations in color would often be unnoticable to the naked eye, or even if noticed, might easily be mistaken for flaws in the quality of the picture.