Method and apparatus for fast key sharing between user devices in a wireless communication system

A method performed by a reader device in a wireless communication system, the method comprising:

• transmitting, to a first device, first information on whether the reader device supports a fast transaction and the reader device's access level;
• transmitting, to a second device, an authorization command, based on the first information;
• and
• receiving, from the second device, a response to the authorization command,
• wherein the response includes second information including a cryptogram and an identifier of a device,
• wherein a method in which the reader device validates the second device is based on the first information,
• wherein the first device is an owner device validated by the reader device, and
• wherein the second device is a friend device not validated by the reader device.

A first device in a wireless communication system, the first device comprising:

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to:
• receive, from a reader device, first information on whether the reader device supports a fast transaction and the reader device's access level, and
• identify a method in which the reader device validates a second device, based on the first information,
• wherein the first device is an owner device validated by the reader device, and
• wherein the second device is a friend device not validated by the reader device.

A reader device in a wireless communication system, the reader device comprising:

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to:
• transmit, to a first device, first information on whether the reader device supports a fast transaction and the reader device's access level,
• transmit, to a second device, an authorization command, based on the first information, and
• receive, from the second device, a response to the authorization command,
• wherein the response includes second information including a cryptogram and an identifier of a device,
• wherein a method in which the reader device validates the second device is based on the first information,
• wherein the first device is an owner device validated by the reader device, and
• wherein the second device is a friend device not validated by the reader device.