| 摘要 |
It is presented a method performed for controlling access to a physical space. The method is performed in an access control device and comprises the steps of: communicating with an electronic key to authenticate the electronic key; performing a lookup of an access right using an identity of the electronic key in a credential cache when the access control device is unable to communicate with an access control server; and sending an unlock signal when the access right indicates that the electronic key should be granted access; retrieving, from the access control server, an access right indicating whether the electronic key should have access or not, when the access control device is able to communicate with the access control server; and updating the credential cache with the access right retrieved from the access control server. |
