Table of Contents - Q.4164 (04/2025) - Protocols for Ck interfaces for quantum key distribution networks

1	Scope
2	References
3	Definitions
	3.1	Terms defined elsewhere
	3.2	Terms defined in this Recommendation
4	Abbreviations and acronyms
5	Conventions
6	Ck interface
7	Signalling procedure
	7.1	Signalling procedures for key relay request in a distributed QKDN
	7.2	Signalling procedures for key relay request in a centralized QKDN
	7.3	Signalling procedures for session creation request
	7.4	Signalling procedures for session creation notification
	7.5	Signalling procedures for key reservation request
	7.6	Signalling procedures for key allocation request
8	Signalling messages and parameters
	8.1	Key relay next hop request message
	8.2	Response to key relay next hop request message
	8.3	Key relay request notification message
	8.4	Key relay request message
	8.5	Response to key relay request message
	8.6	Session creation request message
	8.7	Response to session creation request message
	8.8	Session creation notification message
	8.9	Response to session creation notification message
	8.10	Key reservation request
	8.11	Response to key reservation request
	8.12	Key allocation request
	8.13	Response to key allocation request
9	Security considerations
Appendix I – Protocol implementation using the transmission control protocol
Appendix II – Protocol implementation using gRPC
	II.1	Mapping of signalling messages to gRPC messages
	II.2	Key relay request notification
	II.3	Key relay request and response message
	II.4	Key reservation request and response message
	II.5	Key allocation request and response message
Bibliography