Lightweight implementation of DES algorithm for resource constrained devices

Many services are being moved to digital environments with industry 4.0. However, the information in the digital environment poses a great risk. Therefore, ensuring the security of information on the users of online applications is a necessity. This perspective requires secure signal processing. But it is difficult to guarantee secure signal processing for resourceconstrained devices. Throughout history, many cryptographic algorithms such as DES, 3DES, AES have been suggested to transferring sensitive information. But there are several problems in these algorithms such as the security, speed, excessive consumption of energy, the internal structure of the design are not clear to the public. Lightweight cryptology has emerged to solve some these problems. This thesis presents new design architecture for improving the software implementation of the DES. New proposed acceleration technique has been used to speed up the DES algorithm in software. The results show that the developed code is faster than the original DES. Another contributor to the thesis is a chaos-based substitution box. The performance metrics of the proposed substitution boxes are close to the performance values of the original DES substitution boxes. Therefore, the new cryptographic building block is an alternative to original design. In fact, the design of the original DES substitution boxes is unclear and this is a problem. The clearness of the design of the new proposed substitution boxes aims to solve this problem.