Out-of-band quantum key distribution using cellular SMS

A method comprising:

• receiving, at a server computer comprising a processor and from a user device, a client identifier and a first key identifier, wherein the client identifier identifies the user device, and wherein the first key identifier identifies a first key comprising a first key value comprising a first quantumly generated random bit string;
• requesting, by the processor and from a key service, the first key value via a first key request comprising the first key identifier and the client identifier;
• in response to receiving, from the key service, the first key value, requesting, by the processor and from the key service, a second key comprising a second key value;
• receiving, by the server computer and from the key service, the second key value and a second key identifier that identifies the second key, wherein the second key value comprises a second quantumly generated random bit string;
• providing, by the processor and to a short message service center, the second key value with instructions to deliver the second key value to the user device;
• performing, by the processor, an operation on the first key value and the second key value to obtain a copy of a pre-shared key;
• and
• providing, by the processor and to a device, the copy of the pre-shared key for use in exchanging encrypted communications with the user device.

A computer storage medium having computer-executable instructions stored thereon that, when executed by a processor, cause the processor to perform operations comprising:

• receiving, from a user device, a client identifier and a first key identifier, wherein the client identifier identifies the user device, and wherein the first key identifier identifies a first key comprising a first key value comprising a first quantumly generated random bit string;
• requesting, from a key service, the first key value via a first key request comprising the first key identifier and the client identifier;
• in response to receiving, from the key service, the first key value, requesting, from the key service, a second key comprising a second key value;
• receiving, from the key service, the second key value and a second key identifier that identifies the second key, wherein the second key value comprises a second quantumly generated random bit string;
• providing, to a short message service center, the second key value with instructions to deliver the second key value to the user device;
• performing an operation on the first key value and the second key value to obtain a copy of a pre-shared key;
• and
• providing, to a device, the copy of the pre-shared key to use in exchanging encrypted communications with the user device.