Patent ID: 11917063
Assignee: KONINKLIJKE PHILIPS N.V.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 12:
13. A first cryptographic device comprising
a communication interface circuit, wherein the communication interface circuit is arranged to communicate with a second cryptographic device; and
a processor circuit,
wherein the processor circuit is arranged to generate a first private-key,
wherein the processor circuit is arranged to compute a first public-key from the first private-key,
wherein the processor circuit is arranged to allow transfer of the first public-key to the second cryptographic device,
wherein the processor circuit is arranged to receive a second public-key and encapsulated data from the second cryptographic device,
wherein the processor circuit is arranged to compute a first raw shared key from the second public-key and the first private-key,
wherein computing the first raw shared key comprises a noisy multiplication between the second public-key and the first private-key,
wherein the processor circuit is arranged to decapsulate the encapsulated data using at least part of the first raw shared key so as to obtain a key seed,
wherein the processor circuit is arranged to apply a validation procedure to the obtained public key so as to determine if the public key is secure for decapsulation of a key seed,
wherein the key seed is not decapsulated or the decapsulated data is not used if the validation procedure determines that the public key is insecure.