GSLHA: Groupbased Secure Lightweight Handover Authentication Protocol for M2M Communication Machine to machine (M2M) communication, which is also known as machine type communication (MTC), is one of the most fascinating parts of mobile communication technology and also an important practical application of the Internet of Things. The main objective of this type of communication, is handling massive heterogeneous devices with low network overheads and high security guarantees. Hence, various protocols and schemes were proposed to achieve security requirements in M2M communication and reduce computational and communication costs. In this paper, we propose the groupbased secure lightweight handover authentication (GSLHA) protocol for M2M communication in LTE and future 5G networks. The proposed protocol mutually authenticates a group of MTC devices (MTCDs) and a new eNodeB (eNB) when these simultaneously enter the coverage of the eNB with considering all the cellular network requirements. The security analysis and formal verification by using the AVISPA tool show that the protocol has been able to achieve all the security goals and overcome various attacks. In addition, the comparative performance analysis of the handover authentication protocols shows that the proposed protocol has the best computational and communication overheads.

IoT Protocols for Lowpower Massive IoT: A Communication Perspective The constantly growing number of resourcelimited MTC (MachineType Communication) devices is challenging both the telecommunication operators as well as industrial companies to efficiently design communication technologies, protocols, and enddevices for data transmissions in the upcoming 5G and beyond wireless communication networks. As the communication technologies for mMTC (massive Machine Type Communications)massive IoT (Internet of Things) attracted significant attention over the past years due to the extended communication range and improved lifetime of batteryoperated devices, the debate turned from the communication parameters of available LowPower WideArea (LPWA) technologies towards the implementation issues related to efficient data transmissions with respect to certain level of Quality of Service (QoS). In this regard, this paper aims to analyze already introduced communication protocols (i.e., TCP, UDP, CoAP (Constrained Application Protocol), and MQTT (Message Queuing Telemetry Transport)) possible to use for data transmission in massive IoT scenarios. Along with the highlights of the protocols in question, a practical implementation is done using the emerging cellular IoT standard, namely, NBIoT (Narrowband IoT). Out of the obtained data, the focus is primarily given to the sidebyside comparison of protocolsxe2x80x99 overheads and the subsequent data usage as the amount of transmitted data is deriving the monthly fees.