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

Claim 0:
1. A method performed by a first communication device for generating a symmetric session key for encrypted communication with a second communication device comprising:
Generating a blinding value sr for a first private key component and a blinding value er for a second private key component 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;
Generating a blinded public key from the first private key component, the second private key component, the blinding value sr for the first private key component and the blinding value er for the second private key component using a public key generation function;
Transmitting the blinded public key to the second communication device for encryption of a shared secret generated by the second communication device;
Receiving the shared secret from the second communication device;
Generating the session key for encrypted communication with the second communication device from the shared secret;
Encrypting, using the session key, an information from which the blinding value sr for the first private key component and the blinding value er for the second private key component are derivable by the second communication device; and
Transmitting the encrypted information to the second communication device.