Assa Abloy Ab

Adam Augustyn

Martin Kaufmann

Frans Lundberg

Andrzej Bohdan Kostyk

Krzysztof Grzegorz Fabjanski

It is provided a method for performing an action by an electronic device (), based on a first partial secret key () and a corresponding second partial secret key (), wherein the first partial secret key () and the second partial secret key () form part of a threshold cryptography scheme () associated with a public key (). The method comprises: transmitting (), upon the device initialising, a request for a first partial secret key () to a key server (); receiving () the first partial secret key () from the key server (); storing () the first partial secret key () only in volatile memory (); retrieving () a second partial secret key () from non-volatile memory (); and performing () an action based on applying both the first partial secret key () and the second partial secret key ().

Authenticating an electronic device based on threshold cryptography using partial secret keys

A verifier device of an authentication system comprises physical layer circuitry and processing circuitry coupled to the physical layer circuitry. The processing circuitry is configured to encode an authentication command for sending to a credential device; decode a response communication received from the credential device, wherein the response communication includes a first random number; encrypt the first random number, a second random number, and verifier keying material for sending to the credential device; decrypt encrypted information received from the credential device, wherein the encrypted information includes the first random number, the second random number, and receiver keying material; and calculate a session encryption key using the verifier keying material and the receiver keying material.

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Krzeszowice, Poland

Adam Augustyn