Apparatus and method for generating secure key

A method of a terminal connected to another base station (BS) for a second communication system in a wireless environment, the method comprising:

• receiving, via the another BS from a BS for the first communication system, a radio resource control (RRC) connection reconfiguration message comprising information regarding a first key;
• generating a secure key for a security of the first communication system based on the first key, an identifier (ID) for indicating an algorithm for applying to the first key, a distinguisher for indicating a function of the algorithm indicated by the ID;
• and
• transmitting, to the BS, a signal based on the generated secure key.

An apparatus of a base station (BS) for a first communication system connected to another BS for a second communication system via an internal interface in a wireless environment, the method comprising:

• at least one transceiver;
• and
• at least one processor, coupled to the at least one transceiver, configured to:
• generate a first key by applying a key derivation function (KDF) to a random value and a count value, the random value generated by using a random function;
• generate a secure key for a security of the first communication system based on the generated first key, an identifier (ID) for indicating an algorithm for applying to the first key, and a distinguisher for indicating a function of the algorithm indicated by the ID;
• and
• transmit, to a terminal connected to the another BS, a signal based on the generated secure key.

An apparatus of a terminal connected to another base station (BS) for a second communication system in a wireless environment, the method comprising:

• at least one transceiver;
• and
• at least one processor, coupled to the at least one transceiver, configured to:
• receive, via the another BS from a BS for the first communication system, a radio resource control (RRC) connection reconfiguration message comprising information regarding a first key;
• generate a secure key for a security of the first communication system based on the first key, an identifier (ID) for indicating an algorithm for applying to the first key, a distinguisher for indicating a function of the algorithm indicated by the ID;
• and
• transmit, to the BS, a signal based on the generated secure key.