1. Manual copy quantum key and sequence number. At the time of VPN tunnel setting up,
the quantum keys as consider as a seed value (QKS) which it was generated from Quantum Random Number Generator (QRNG) [11].
While, the sequence number (SN) 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.