3. Steganography

Question 1

what is steganography

Answer 1

hiding in plain sight

• attacker does not know something is hidden there
• payload: what you want to hide
• cover object: what you want to hide in
• stego object: the resultant object with hidden payload

Question 2

difference between steganography and cryptography

Answer 2

stego: hides presence, not encrypted, attacker cannot see
crypto: encrypted, attacker can see

Question 3

how does steganography work

Answer 3

least significant bit algorithm

Question 4

what is steganalysis

Answer 4

1. detect
   - check for distortions
   - black white filtering
   - if RGB value is 254, remain the same
   - if RBG value is 253, set to 0, changed to white
2. extract