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1. A method of controlling key relay in a quantum key distribution network (QKDN), the method comprising, by a SOFTWARE-DEFINED NETWORKING (SDN) controller: receiving, by a first control entity, a key relay route request from a key management (KM) layer; determining, by the first control entity, whether or not key relay is associated with a plurality of resource groups; and transmitting a key relay route request from the first control entity to a second control entity, when key relay is associated with the plurality of resource groups, wherein key relay route information produced by the second control entity is provided to the KM layer, wherein the key relay route request from the KM layer is based on a request from a cryptographic application, and the method further comprises supplying a key corresponding to the request to the cryptographic application, for performing encoded communication by the cryptographic application between remote parties.
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