# Design of a Lightweight Cryptographic Scheme for Resource-Constrained Internet of Things Devices
## 1 Introduction  
The current significant advancement in the network of intelligent objects is the Internet of Things (IoT). It has various uses, such as radiation monitoring in nuclear power plants, smart cities, smart homes and smart environments in general, animal tracking, health monitoring, and many more applications. The main issues in IoT applications are energy management, IPv6 adoption, standardization, and security [1].  
Any wireless cryptographic scheme has serious data security challenges. A cryptographic method is a crucial component of network security. For IoT systems, \"Lightweight Cryptography (LWC)\" is most suited. Lightweight cryptography is a protocol designed for use in constrained environments such as sensor networks, meters, healthcare, the Internet of Things, cyber-physical systems, intelligent energy systems, indicators, custom controls, etc. [2]. In addition, formal methods on IoT application layer protocols for improving security and detecting security issues remain an open challenge.  
The motivation for developing SLA includes the following. Major standards organizations closely follow lightweight cryptographic development. Several lightweight cryptographic methods have been standardized by The International Organization for Standards (ISO) and the International Electro-technical Commission (IEC). These standard bodies are also reviewing more algorithms to include in their standards. Recently, the National Institute of Standards and Technology (NIST) made public its lightweight algorithms portfolio requirements [3]. This announcement came after the Institute held two workshops on lightweight cryptography [4, 5].  
Enforcing security against attacks on IoT systems is a challenging task. Once the required features of an IoT system have been added, cryptographic engineering aims toharmonize conflicting requirements to create secure yet usable embedded IoT systems. The field of LWC for IoT applications combines cryptography, computer science, and electrical engineering. Solutions to IoT security problems are converging on cryptographic engineering. This paper attempts to reconcile these conflicting requirements. In this paper, we propose a new lightweight cryptographic scheme built from finite fields, using their underlying mathematical structure. In general, this choice does not influence the security of the scheme, but influences the performance of the resulting implementation. This approach has become a major design trend in cryptography, due to the increasing importance of small-scale embedded IoT devices. In a lightweight cryptographic scheme, the construction of a strong non-linear S-box (confusion layer) uses Galois field multiplication which meets cryptographic properties, and provides a novel method to construct diffusion layers by 32-bit binary matrix. The resulting proposed SLA scheme provides a sufficient security level against most of the well-known attacks on block ciphers, such as linear and differential cryptanalysis.  
This paper is organized as follows. Section 2 is a presentation of research work. Section 3 is a depiction of the block cipher SLA. Section 4 is an assessment of the block cipher SLA, and Section 5 is the conclusion.