Briefly describe known cover attack and known message attack.

Question

What will be an ideal response?

Answer 1

ANSWER: • Known cover attack—Used when the cover-media, the original file with no hidden message, and the stego-media, the converted cover-media file that stores the hidden message, are available for analysis. By analyzing the original and steganography files, further comparisons can be made to identify common patterns that might help decipher the message.
• Known message attack—Used when the hidden message is revealed later, allowing further analysis of new messages. Similar to the known cover attack, this method uses comparative analysis to decipher the message. Because the message is known, deciphering it takes less effort.