Internet of Things (IoT) is a rapidly growing technology and will be of great importance in the future consisting of a vast number of interconnected networks. One of the important networks that will be part of future IoT is Wireless Sensor Network (WSN) connected with the help of rapidly emerging devices and technologies. Due to the unlimited interconnection of various technologies in IoT, the threat to confidentiality and security of data has also increased. WSN uses Low Energy Adaptive

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... ing Hierarchy (LEACH) for constructing an energy-efficient network that is prone to a vast number of attacks and one of them is HELLO flood. This paper makes use of HFS-LEACH (Hello Flood Secure LEACH) as an extension to LEACH protocol for the purpose of protecting cluster head from Hello flood attack. HFS-LEACH makes use of RBG color cube numbers, a unique Automorphic number, and a unique ID for each sensor node for the purpose of authenticating a sensor node as CH. The HFS-LEACH is implemented with the help of NS2 for verifying its efficiency.