Description: Key-encryption-key (KEK) used as the key for the 128 bit AES Key Wrap algorithm to encrypt the PMK in the key attribute. If the key is present in request, it should be taken as a hint by the server that the sender prefers this method of encryption over others. To maintain security actual keys after configuration are never returned in get request. If keys are configured then '***' is returned. If keys are not configured then empty string is retunred. bsnRadiusAuthServerKeyFormat is used this key. if the format chosen is ascii then it should be 16 bytes in length. if the format chosen is hex then it should be 32 bytes in length.