Patent ID: 11936781
Assignee: DEUTSCHE TELEKOM AG
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An encryption system, comprising:
at least one intermediate quantum node;
a first quantum key distribution (QKD) device at a first location; and
a second QKD device at a second location;
a first encryption device at the first location:
a second encryption device at the second location; and
a first key agreement device at the first location; and
a second key agreement device at the second location;
wherein the first QKD device and the second QKD device are configured to together create a quantum secured key;
wherein the first QKD device is configured to communicate with at least one common intermediate quantum node via a first quantum channel;
wherein the second QKD device is configured to communicate with the at least one common intermediate quantum node via a second quantum channel;
wherein the first and second QKD devices communicate via an authenticated digital distillation channel separate from the first and second quantum channels for transmitting and receiving control information;
wherein the first and second encryption devices are configured to create a symmetrically encrypted channel between the first and second encryption devices using the quantum secured key;
wherein the first and second key agreement devices are configured to together create, in a key agreement step, an encryption key using an asymmetric key exchange procedure;
wherein the first and second key agreement devices are configured to exchange key material for creating the encryption key via the symmetrically encrypted channel.