Patent ID: 11869292
Assignee: ASSA ABLOY AB
Field: Control (Instruments)
Classification: CPC G  H | IPC G  H

Claim 6:
7. A lock device for controlling access to a physical space using a co-sign delegation, the lock device comprising:
a processor; and
a memory storing instructions that are configured to, when executed by the processor, cause the lock device to:
receive an access request from an electronic key;
obtain a plurality of delegations, wherein each delegation is a delegation from a delegator to a delegatee, the plurality of delegations collectively forming a chain of delegations wherein when two delegations are chained together, the delegatee of one delegation is the delegator of the next delegation;
determine that a delegation in the chain of delegations is a co-sign delegation, the co-sign delegation indicating that all further delegations need to be cryptographically signed by both the delegator of the respective delegation and by an access controller;
evaluate a delegator time constraint applied by a delegator on a delegation of the chain of delegations, and if the delegator time constraint is not violated;
grant access to the physical space when the chain of delegations start in an owner of the lock device and ends in the electronic key; and when all delegations in the chain of delegations after the co-sign delegation are cryptographically signed by both the delegator of the respective delegation and by the access controller, by verifying that each co-sign delegation has been transmitted to all the delegatees in the chain of delegations after the co-sign delegation, and that a co-signed delegation has been signed by the delegator, has been provided to the access controller, and has been signed by the access controller.