# Resilient Green Cellular IoT for Landslide Monitoring Using Voice Channels
## 2 Related Work
In contrast, in our case, the devices are connected directly to the Internet. After analyzing various research and review papers, we find that none of the approaches meet the requirement of handling DoS attacks in the C-IoT nodes with less than 2 KB of RAM that are directly connected to the Internet. Hence, we came up with the design of _voice response Internet of Things (VRITHI)_ to meet the requirements in our deployment. We do a qualitative comparison of VRITHI with selective state of the art work on IoT security for resource-constrained devices. In Table 2, we list down important features of these papers and provide the reasons why their solutions cannot be applied in our scenario. [PERSON] et al. [27] explain the major advantages and disadvantages of symmetric and asymmetric PSK systems in resource-constrained devices for mitigating the attacks. Even though the key-based approach is a better authentication technique, it is not favorable in practical situations due to computational and communication complexities. Moreover, it leads to new DoS attacks in the network due to authentication and power depletion. Bogus message injection, such as DDoS attack, can also happen in WSN networks. However, the proposed scheme also requires more memory and mandates powerful hardware that is not suitable for Green IoT. The authors in Reference [26] develop a lightweight authentication protocol that could function with a similar hardware as ours for cloning attacks but on 802.15.4 modules. The cloning attack is different from DoS attack and requires physical access to hardware to clone the device. Further, the authentication scheme does not consider flooding attacks on the IP stack. The author also state that deploying the traditional security models with such resource constraint devices with less than 2 Kb RAM and 32 KB program memory is not a feasible option. \begin{table}
\begin{tabular}{p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt}} \hline \hline
**Ref.** & **Description** & \begin{tabular}{c} **Node** \\ **Memory** \\ **Usage \(>\) 2 KB** \\ \end{tabular} & \begin{tabular}{c} **Node** \\ **Power** \\ \end{tabular} & **C-IoT** & \begin{tabular}{c} **Require** \\ **Gateway or** \\ **Firewall?** \\ \end{tabular} & \
\begin{tabular}{c} **Gateway** \\ **Resource** \\ **Resource** \\ \end{tabular} &
\begin{tabular}{c} **Reason for** \\ **not Using** \\ \end{tabular} \\ \hline
[23] & \
\begin{tabular}{c} Security in green \\ fog and cloud \\ computing \\ \end{tabular} & N & Low & N & Y & High &
\begin{tabular}{c} Requires \\ gateway for \\ Internet \\ \end{tabular} \\ \hline
[19] & \
\begin{tabular}{c} Learning methods \\ to characterize the \\ packets anomalies \\ \end{tabular} & Y & Moderate & Y & N & NA &
\begin{tabular}{c} Higher node \\ memory \\ \end{tabular} \\ \hline
[24] & \
\begin{tabular}{c} Green IoT in data \\ centers for switches \\ and routers \\ \end{tabular} & N & Low & N & Y & High &
\begin{tabular}{c} Requires \\ gateway for \\ Internet \\ \end{tabular} \\ \hline
[21] & \
\begin{tabular}{c} Security \\ framework for IoT \\ node \\ \end{tabular} & Y & High & Y & N & NA &
\begin{tabular}{c} Higher \\ memory and \\ processing \\ power \\ \end{tabular} \\ \hline
[20,22] & \
\begin{tabular}{c} Filtering DDoS \\ packets in local \\ gateway \\ connecting \\ GreenIoT devices \\ \end{tabular} & N & Moderate & N & Y & Moderate &
\begin{tabular}{c} Requires \\ gateway or \\ border \\ router for \\ Internet \\ \end{tabular} \\ \hline
[25,26] & \
\begin{tabular}{c} Hierarchical key \\ policy encryption \\ (H-KP-ABE) for IoT \\ Health care \\ \end{tabular} & Y & Moderate & Y & N & NA &
\begin{tabular}{c} High \\ memory and \\ moderate \\ power \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 2: A comparison of security-related approaches in green IoT. The review article, in Reference [7], discusses challenges in providing green solutions for cellular IoT where IoT devices are connected to cellular networks, especially in 5G network.