Copyright: © the author(s), publisher and licensee Technoscience Academy. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non- commercial use, distribution, and reproduction in any medium, provided the original work is properly cited International Journal of Scientific Research in Computer Science, Engineering and Information Technology ISSN : 2456-3307 (www.ijsrcseit.com) doi : https://doi.org/10.32628/CSEIT2390244 388 Design and Develop a Secure CPS Flexible Framework to Improve the Cyber Security using a New Security Algorithm P Salman Raju 1* , P Venkateswara Rao 2 , S Sreenivasa Murthy 3 1,2 Department of Computer Science and Engineering, Adikavi Nannanaya University, Rajahmundry, India 3 Department of Systems, Institute of Public Enterprise, Hyderabad-India A R T I C L E I N F O A B S T R A C T Article History: Accepted: 01 April 2023 Published: 20 April 2023 CPS is an active system that transforms a physical system into a computerized system through the use of technology and a set of instructions that govern how the system operates. Because of CPS, even the most basic of equipment can function as a smart device. For the most part, these devices have limited processing capabilities, operate at low power, and have a small amount of storage space. The Internet of Things integrates everyday “things” with the internet. Computer Engineers have been adding sensors and processors to everyday objects since the 90s. However, progress was initially slow because the chips were big and bulky. Low power computer chips called RFID tags were first used to track expensive equipment. As computing devices shrank in size, these chips also became smaller, faster, and smarter over time. Existing security mechanisms works efficiently on high end CPS devices. The performance analysis also shows these algorithms perform well against different attacks. But when constraint-based applications come into the picture it was found that existing mechanism identifies many installation and configuration problems. Even these algorithms if installed in constraint- based application overall performance of the system degrade. To overcome these problems, we proposed a secure CPS flexible framework to improve the cyber security using a new session key security algorithm. So proposed algorithm must focus on constraint-based applications. It must support all the parameters of constraint-based devices. Key generated through algorithm must follows the key management design principles which includes scalability, freshness and accountability. Keywords: Internet of Things, Smart Home Networks, Network Security, flexible framework, Cyber-attacks, Cyber Physical systems, New Security Technique, Secure session and token-based authentication algorithm Publication Issue Volume 10, Issue 2 March-April-2023 Page Number 388-402 I. INTRODUCTION Cyber Physical system (CPS) is defined as a new generation of electronics system which works with integration of physical system and computational algorithm. It not only detects the ambient temperature, but it also recognizes human objects and detects human activity. Through the Seventh EU