Cryptography Reference
In-Depth Information
FIGURE 16.24
The four pixels of each stego block CB
0
j.
8
<
T = C
0
z k D
0
k G
0
zg
0
1
k Hz
0
h
0
1
P = T
0
mod 2
t
P
0
= fp
0
i
j i 2f1; 2;:::tg;p
0
i
2f0; 1gg
;
(16.18)
:
(c) If for each block, P
0
2
= p
2
, P
0
1
= p
1
, then regard the stego-
image as having passed authentication and continue; other-
wise, decide that the stego-image has been tampered with.
FIGURE 16.25
The 2-bit check bits carried in CB'z when t = 2.
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