Table 1 The definition of the notations.
From: A Forward Authentication Key Management Scheme for Heterogeneous Sensor Networks
| The |
|---|---|
| The pairwise key between L-sensor |
| The unique ID for H-sensor |
| The unique ID for L-sensor |
| The |
| A temporary session key for all H-sensors and L-sensors |
| A random number generated by H-sensor |
| The encryption of message |
| The message |
| A collision-resistant cryptographic hash function |
| XOR operator |
| A concatenation operator |
th cluster key of H-sensor
and H-sensor 
th key in the key-chain, where 
with MAC using the key 
is encrypted by 
