Embodiments provide an apparatus, method, product and storage medium for secure communication, wherein a message is sent over a secure signalling path to a recipient, the message including a value indicating a key for encrypting or decrypting information for secure communication, or a key derivation value for deriving a key. The message further includes an indication indicating the type of usage of the value. The receiver of the message may return a message which also includes a key or key derivation value and an indication indicating the type of key or type of usage of the value.