The vision of Internet of Things (loT) is to enable devices to collaborate with each other on the Internet. Multiple devices collaboratin g with each other have opened up various opportunities in multitude of areas. It has presented unique set of challen g es in scalin g the Internet, techniques for identification of the devices, power efficient al g orithms and communication protocols. Always connected devices have access to private sensitive information and any breach in them is a hu g e security risk. The loT environment is composed of the hardware, softwareand middleware components makin g it a complex system to mana g e and secure. The objective of this paper is to present the challen g es in loT related to security, its challen g es and recent developments throu g h a comprehensive review of the literature.Index Terms-Internet of Thin g s; security in lOT

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