Many researchers have tried to use the chaotic systems in generating different cryptographic tools, in order to provide high level of security to the data passing through network. In modern symmetric cryptographic systems, one of the most essential functions is a nonlinear mapping Substitution process which is responsible for creating the confusion between plaintext and ciphertext. It replaces each input bits by other bits using the lookup table S-Box. In this paper a new S-Box based on a 1D logistic map chaotic system was designed. The chaotic sequence generated from the 1D logistic map was processed to generate the hexa code values, and after that this hexa code also processed to construct the new good S-Box. This proposal was evaluated using the S-Box tests criteria including avalanche, balanced, completeness, strict avalanche, and invertibility. The analysis results show that the proposed S-Box passes all these statistical tests, has large avalanche effect and therefore the S-Box can avoid many attacks. The construction of both Substitution-Box and its inverse take only few milliseconds, so it can be used in many lightweight block ciphers.

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In recent years, the rapid development in the field of wireless technologies leaded to appear a new topic known as the Internet of things (IoT). The IoT applications can be found in various fields of our life such as smart home, health care, smart building, and etc. In all these applications the data collected from the real world are transmitted through the Internet, therefore these data have become a target of many attacks and hackers. So, a secure communication must be provided to protect the transmitted data from unauthorized access. This paper focuses on designing a secure IoT system to protect the sensing data. In this system, the security is provided by the use of Lightweight AES encryption algorithm to encrypt the data received from physical environment. The hardware used in this proposal is the Raspberry Pi 3 model B and two types of sensors. The LAES algorithm was embedded inside the Raspberry in order to protect the sensing data that comes from sensors connected to the Raspberry Pi before sending it through network. The analysis results show that the proposed IoT security system consumes less time in encryption/decryption and has high throughput when compared with others from related work. Its throughput is higher in about 19.24% than one system from the related studies.