Patent ID: 11882101
Assignee: INFINEON TECHNOLOGIES AG
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 17:
18. A method for generating a symmetric session key for encrypted communication with a first communication device, the method being performed by a second communication device, comprising:
Receiving a blinded public key from the first communication device;
Generating a shared secret;
Encrypting the shared secret using the blinded public key;
Transmitting the encrypted shared secret to the first communication device;
Generating a session key for encrypted communication with the first communication device from the shared secret;
Receiving encrypted information from the first communication device, decrypting the information using the session key and deriving a blinding value sr for a first private key component of the first communication device and a blinding value er for a second private key component of the first communication device from the information, wherein the blinding value sr for the first private key component is a value to be combined with the first private key component to mask the first private key component and wherein the blinding value er for the second private key component is a value to be combined with the second private key component to mask the second private key component; and
Verifying that the received blinded public key is a public key of the first communication device using the blinding value sr for the first private key component and the blinding value er for the second private key component.