DEncrypto

The Project contains the raw files as well as the compiled file to the code which helps in performing the Steganographic operations.

• Methods involved are LSB, LSB2, and LSB3.
• Each folder contains a sample input file and image to use.
• All LSB methods work only for BMP files.
• MSE is calculated for a 600x600 image, change this number according to your image size or take the value from Header.

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LSB

This method deals with replacing the last bit of a 24-bit image with the message bit.

• 24-bit image means that each pixel takes 24-bits/3-bytes i.e. Red component (8 bit), Green Component (8 bit), and Blue Component (8 bit).
• first 40 bytes are saved for header of file. (Take care in case of Modifying Code)

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LSB2

• This method uses the XOR of last two bits of image bytes as the Least significant bit.

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LSB3

• This method takes last 3 bits to take XOR of image bytes and use it as LSB.

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Example

For Example - Source image = img.bmp and Message text = text.txt

Encrypt

• Open kernal and go to the folder containing these files.
• type "./lsb -e img.bmp stag_output.bmp text.txt" -- here stag_output is the output image that contains hidden message.

Decrypt

• Open kernal and go to the folder containing these files.
• type "./lsb -d stag_output.bmp trash.bmp decyphered_text.txt" -- here decyphered_tex is the output text that contains hidden message.
• trash.bmp is collaterally damaged file.