Security Vulnerabilities and Countermeasures for Time Synchronization in TSCH Networks

Algorithm 1

Secure pairwise time synchronization.

1:  Node A sends a synchronization request to parent node B:

2:   ;

3:  Node B sends back an ACK message to A:

4:   ,

       ;

5:  Node A calculates:

6:   , ;

7:  if ()

8:   ;

9:  else

10:   Filter out the synchronization packet, ;

11:  if ()

12:   Blacklist(B), Send an alarm message to the Root;

13:  end