US 2020/0092330 A1 · ESTABLISHING A PROTECTED COMMUNICATION CHANNEL

Abstract

To establish a first protected communication channel between a device D and a first server S, a symmetric key KS is derived at the device D, based on a device identifying key KD and public key information dependent on a first server public key Spublic, of the first server S. The symmetric key KS is derived in a corresponding way at a second server T. The symmetric key KS is transmitted from the second server T to the first server S on a second protected communication channel. Communication on the first protected communication channel between the device D and the first server S is protected using a communication key KC which is dependent on the symmetric key KS. This can enable a device D lacking support for asymmetric key cryptography to securely enter into communication with the first server S.

Claims19

Dependent claims

A method for establishing a first protected communication channel between a device and a first server, the first server having a first server public key, and the device having a device identifying key shared with a second server different to the first server;

the method comprising:
deriving a symmetric key at the device, based on the device identifying key and public key information dependent on the first server public key;
deriving the symmetric key at the second server, based on the device identifying key and the public key information;
transmitting the symmetric key from the second server to the first server using a second protected communication channel;
and
protecting communication on the first protected communication channel between the device and the first server using a communication key which is dependent on the symmetric key.

3 more elements

Dependencies are inferred from the claim text.

Establishing a protected communication channel

Life of this patent

Establishing a protected communication channel

Life of this patent

Abstract

Claims19