Data Authentication for Wireless Sensor Networks with High Detection Efficiency Based on Reversible Watermarking

Algorithm 1

Localizing synchronization points

1. i⟵1

2. groupflag ⟵0

3. while (Stream S is not over) do

4. if ((m/2 < i <3m/2 && md5(S_i) % m ==0 && groupflag ==0)||i ==3m/2)

5. spflag ⟵0//S_i is the synchronization point of generator group;

6. i ⟵0

7. groupflag ⟵1

8. else if ((m/2 < i <3m/2 && md5(S_i) % m ==0 && groupflag ==1)||i ==3m/2)

9. spflag ⟵ 1//S_i is the synchronization point of carrier group;

10. i ⟵0

11. groupflag ⟵0

12. end if

13. i ⟵ i+1

14. end while