Week 3 - LSB algorithm

Question 1

What is LSB Algorithm?

Answer 1

A steganography technique that makes uses of the LSB of a pixel to hide information

Question 2

What is the least significant bit in a pixel?

Answer 2

red blue green
pixel = 1011 0101 1111

red = 101**1 LSB **

change

1000

Question 3

Why is the LSB chosen?

Answer 3

changing the LSB causes negligible visual change

Question 4

How does the LSB algorithm embed data into a cover image?

Answer 4

1. Payload is split bit bu bit
2. each payload bit is compared with the LSB of a pixel
3. if they don’t match the LSB is flipped

Question 5

Solutions to problem of LSB

Answer 5

Apply randomness

use psudo-randomness with a seed value to determine next position to hide data

Question 6

Problems with LSB

Answer 6

1. very Sequential by nature (predictable)