Abstract: According to a first aspect, it is provided a method for requesting access to a physical space secured by a lock. The method is performed in a mobile device of a user and comprises the steps of: authenticating the mobile device with an authentication server, resulting in a token, being a data item, indicating one or more access groups to which the user belongs, wherein the token is cryptographically signed by the authentication server; storing the token in the mobile device; obtain a lock identifier of the lock; and transmitting an access request to an access control device, the access request comprising the token and the lock identifier.

Abstract: According to a first aspect, it is provided a method for requesting access to a physical space secured by a lock. The method is performed in a mobile device of a user and comprises the steps of: authenticating the mobile device with an authentication server, resulting in a token, being a data item, indicating one or more access groups to which the user belongs, wherein the token is cryptographically signed by the authentication server; storing the token in the mobile device; obtain a lock identifier of the lock; and transmitting an access request to an access control device, the access request comprising the token and the lock identifier.

Abstract: Maintaining a plurality of different sets of data groups for virtualized credentials of a holder includes storing a first subset of the data groups according to a standard for storing data groups, where the standard verifies each data group in the first subset of data groups, storing a second subset of the data groups as a plurality of auxiliary data elements that are separate from the first subset, where auxiliary data elements are not directly accessible using the standard, providing at least one custom data group in the first subset that verifies each of the auxiliary data elements, and verifying at least one of the auxiliary data elements using the custom data group and verifying the custom data group using the standard. The standard may be ISO 18013. The digital signature may be provided by a party that is trusted by a relying party that receives data from the holder.

Abstract: A method and system for facilitating machine-to-machine communications at an improved communication rate is provided. An illustrative system is disclosed to include a transmitting device, a requesting device, and a communication server that helps facilitate an online exchange of data between the transmitting device and requesting device by using information exchanged directly between the transmitting device and receiving device.