WebP Image Steganography Using M8PAM for Android Applications

The spread of using of WebP image format on the Internet, especially on social media and conversation programs, so when sending them repeatedly do not raise doubt, which made it a point of strength in the exploiting this feature by data security field.In this thesis, an integrated system was proposed to protect secret messages using steganography technique to hiding the secret messages within WebP
images format by using the proposed algorithm that named Mod 8 Plus Average Method (M8PAM). The proposed algorithm hides every three bits in one pixel of the cover file according to a proposed algorithm for selection locations.Three layers are applied to the proposed system; the first layer, to select non-transparent pixels, then apply the proposed algorithm for selection locations that will carry the secret message. The second layer, encrypts every three bits from the secret message by redistributing them using random function. Finally, the third layer, use Rivest, Shamir and Adleman (RSA)method to encrypt the header then add it to the secret message before performing the steganography operations.To ensure the success of the proposed algorithm, the proposed algorithm was compared with another algorithm that known as mode 16 method audio (M16MA), where the results showed the advantage of the proposed algorithm by using two measures (MSE, PSNR), the average result of MSE equal (0.0147)and PSNR equal (66.457) to the message size equal (4059 Byte) and cover size (31336 Byte). The data hiding rate equal % 66.66.