A computer-implemented method for efficiently deploying cryptographic key updates may include (1) receiving a request for subscribed cryptographic key material from a client device that includes information that identifies both the client device and cryptographic key material currently possessed by the client device, (2) automatically identifying the client device's subscribed cryptographic key material, (3) determining, by comparing the information received from the client device with the client device's subscribed cryptographic key material, that the cryptographic key material currently possessed by the client device does not match the client device's subscribed cryptographic key material, and (4) deploying at least one update to the client device that causes the client device to update the cryptographic key material currently possessed by the client device to match the client device's subscribed cryptographic key material. Various other methods, systems, and computer-readable media are also disclosed.