Security for mobility between MBMS servers

A non-transitory computer readable medium encoded with a computer program executable by a processor to perform actions comprising:

• triggering, by a user terminal device of a communication network a new streaming server to generate new user-specific security keys for a previously established streaming service in the communication network, wherein triggering the new streaming server to generate the new user-specific security keys comprises starting a generic bootstrapping architecture bootstrapping run;
• receiving, by the user terminal device, from the new streaming server a new security key specific for the new streaming server;
• generating, by the user terminal device, for the new streaming server the new user-specific security keys, wherein the new user-specific security keys for the new streaming server are generated before receiving the new security key specific for the new streaming server, and wherein the generated new user-specific security keys comprise a multimedia broadcast/multicast service user key and a multimedia broadcast/multicast service request key;
• and
• using, by the user terminal device, the new user-specific security keys generated at the user terminal device with the new streaming server for the previously established streaming service.

An apparatus, comprising:

• at least one processor;
• and
• at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least:
• trigger a new streaming server of a communication network to generate new user-specific security keys for a previously established streaming service in the communication network, wherein triggering the new streaming server to generate the new user-specific security keys comprises starting a generic bootstrapping architecture bootstrapping run;
• receive from the new streaming server a new security key specific for the new streaming server;
• generate at the user terminal device for the streaming server user-specific security keys, wherein the new user-specific security keys for the new streaming server are generated before receiving the new security key specific for the new streaming server, and wherein the generated new user-specific security keys comprise a multimedia broadcast/multicast service user key and a multimedia broadcast/multicast service request key;
• and
• use the new user-specific security keys generated at the user terminal device for the new streaming server for the previously established streaming service.