Patent attributes
A method of adding a new device (221) to a device group (210), the device group (210, 220) including a plurality of devices, wherein each device in the device group possesses a device group key and device keys of all other devices in the device group for encryption of messages, except its own device key. The method includes: establishing a secure connection between the new device (221) and a first device (211) in the device group (210); sending, by the first device (211) in the device group (210), the device group key and device keys of all other devices (212, 213, . . . , 21N) in the device group (210) to the new device (221); distributing, by one of the other devices (212, 213, . . . , 21N) in the device group (210), the device key of the first device (211) in the device group (210) to the new device (221); generating and distributing, by one of the devices (211, 212, 213, . . . , 21N) in the device group (210), a device key of the new device (221) to all other devices (211, 212, 213, . . . , 21N) in the device group (210). This approach is also generalized to k-resilient schemes.
