Quantum cryptographic communication control device, quantum cryptographic communication control method, and program

A quantum cryptographic communication control method comprising:

• a step of collecting, via a quantum cryptographic communication control device, link information of a link for which a local key is generated by quantum key distribution and a global key guarantee amount expected for a pair of applications that perform cryptographic communication by using a global key;
• a step of calculating, via the quantum cryptographic communication control device, a link cost used for selecting a route of the global key based on the link information;
• a step of calculating, via the quantum cryptographic communication control device, an amount that can be guaranteed for a local key used in the link so as to satisfy the global key guarantee amount;
• and
• a step of selecting, via the quantum cryptographic communication control device, the route of the global key based on the link cost and the amount that can be guaranteed.

A non-transitory computer-readable storage medium storing a program causing a computer to function as:

• a collection unit that collects link information of a link for which a local key is generated by quantum key distribution and a global key guarantee amount expected for a pair of applications that perform cryptographic communication by using a global key;
• a calculation unit that calculates a link cost used for selecting a route of the global key based on the link information;
• a guarantee unit that calculates an amount that can be guaranteed for a local key used in the link so as to satisfy the global key guarantee amount;
• and
• a selection unit that selects the route of the global key based on the link cost and the amount that can be guaranteed.