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Table 2 Number of messages for compared methods.

From: A Forward Authentication Key Management Scheme for Heterogeneous Sensor Networks

    Pairwise key establishment Key revocation
Kausar et al. [23] H-sensor transmitted 4 1
   received 2 0
  L-sensor transmitted 2 0
   received 4 1
Our Scheme H-sensor transmitted 2 1
   received 1 0
  L-sensor transmitted 1 0
   received 2 1