IoT devices must provide seamless connectivity while meeting stringent power and size constraints. Network availability is a critical determinant of quality of service (QoS) delivered by the IoT System. This paper describes a series of simple experiments which study the impact of Denial of Service (DoS) on a IoT Sensor Node transmitting data to the cloud. The experiment will be used to develop future IoT Sensor Node implementation. The objective of this paper is to use experiments to unravel the negative impacts of DoS attacks on the IoT sensor nodes so as to place it on a strong research foundation. The results show that the impact of DoS is significant to IoT Sensor Node power consumption and network availability. � 2018 IEEE.

In this paper, we analyze the randomness of the RECTANGLE cipher. RECTANGLE is a lightweight block cipher with 64-bit block size and variants key lengths of 80 and 128 bits. Lightweight block cipher requires less computing power than a block cipher algorithm which makes it more efficient to be implemented in low-resource devices. Randomness is an important property of a cryptography algorithm to make sure the output has no message pattern. The randomness testing was performed using the NIST Statistical Test Suite. A total of nine data categories were applied to generate 1,000 input sequences for each algorithm. RECTANGLE-80 and RECTANGLE-128 passed 98.73% and 98.48% of the randomness tests. Our analysis shows that both RECTANGLE variants seem to be non-random based on the 0.1% significance level. The experimental results from this paper identified some weaknesses that can be addressed in future research. � 2020 ACM.