Week 3 - LSB algorithm Flashcards
1
Q
What is LSB Algorithm?
A
A steganography technique that makes uses of the LSB of a pixel to hide information
2
Q
What is the least significant bit in a pixel?
A
red blue green
pixel = 1011 0101 1111
red = 101**1 LSB **
change
1000
3
Q
Why is the LSB chosen?
A
changing the LSB causes negligible visual change
4
Q
How does the LSB algorithm embed data into a cover image?
A
- Payload is split bit bu bit
- each payload bit is compared with the LSB of a pixel
- if they don’t match the LSB is flipped
5
Q
Solutions to problem of LSB
A
Apply randomness
use psudo-randomness with a seed value to determine next position to hide data
6
Q
Problems with LSB
A
- very Sequential by nature (predictable)
