Communication terminal, network device, communication method, and non-transitory computer readable medium

A second network device in a second communication network, the second network device comprising:

• at least one processor, comprising hardware;
• and
• at least one memory operatively coupled with the at least one processor, wherein
• the at least one processor is configured to:
• receive a relocation request message including a security context of a communication terminal from a first network device used in a first communication network, after access rights and security capabilities of the communication terminal are checked by the first network device during a handover procedure to handover the communication terminal from the first communication network to the second communication network, and
• derive, using information included in the security context of the communication terminal, at least one security key to be used in the second communication network.