At the time of VPN tunnel setting up, the quantum keys as consider as a seed value which it was generated from Quantum Random Number Generator
While, the sequence number is used to indicate the hashing order. Both of the two values are manually distributed to the user in such a way that to prevent being attacked.
These key values will be the input of the hash function. For any further reestablished a VPN tunnel,
this procedure will not be proceeded until the sequence number become zero.