• M.Ayasha
• Dr.M.Savitha Devi

At present, internet technology has become very pervasive, since multiple devices connected via the internet. With the emerging growth in internet technology, IoT applications are performing a significant role in the human day today life. However, many researchers stated that IoT is not secure, and various security problems are considered a major challenge for fully fledged IoT infrastructure. The existing IoT architecture faces a number of security challenges and not able to fulfill the futuristic security requirements. Therefore, to overcome such challenges, an efficient and promising "Routing Protocol for Low-power and Lossy Networks" (i.e., RPL) mechanism have been investigated to offer secure IoT infrastructure. The challenges are ever increasing, and the solutions have to be ever improving. Therefore, the contribution of this survey study is to discuss the evolution of IoT technology and security analysis over each layer of IoT infrastructure. Additionally, the survey study categorized into two folds, including secure routing in IoT and authentication mechanisms in the IoT environment. The last section concludes various research challenges that still exist in the literature, and provide guidelines to mitigate existing problems, also can help to understand new research directions to defend IoT against malicious security attacks.

Data transmission, Internet of Things, DDoS attacks, Routing protocols, IoT security.

"A study of Security & Authentication Mechanisms in IoTs: Research Challenges ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.156-162, June 2019, Available :http://www.jetir.org/papers/JETIR1906N73.pdf

"A study of Security & Authentication Mechanisms in IoTs: Research Challenges ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp156-162, June 2019, Available at : http://www.jetir.org/papers/JETIR1906N73.pdf