Enhanced Anonymity: Customized for Roaming and Non-Roaming IoT-Devices in 5G Mobile Network

3GPP-5G, a 5th generation mobile network standardized by the Third Generation Partnership Project (3GPP), is expected to play a pivotal role as a backbone network in the IoT. Recent collaboration among 3GPP and oneM2M - a global initiative for IoT, is a testimony to this fact. Therefore, security issues like anonymity in IoT over 3GPP-5G is gaining significance. Anonymity of a user having an IoT-device is as important as the anonymity of a user having a mobile handset. However, the scope of anonymity of an IoT-device and that of a mobile handset may be different. Unlike a mobile handset, in many use cases of IoT like smart home, the IoT devices have limited mobility and are not carried around from one serving area to another. On the contrary, in use cases like vehicle to vehicle communication, the IoT-devices have the same level of mobility as a mobile handset. Taking this into cognizance; in this paper, customized security schemes for enhanced anonymity in 3GPP-5G is proposed for the resource crunched IoT-devices.