"Smart-Embedded Systems," or Cyber-Physical Systems (CPS), bring together physical, computational, and network resources into a single integrated system. These resources are put to work to provide a solid basis for a better quality of life and a more upscale standard of living. CPSs (Cyber-Physical Systems) are vital in supporting the need for smart products (e.g., airports, homes, cities, hospitals). Control the three sorts of resources Doi: physical, cognitive, and network. In order to uncover the essential knowledge in the various real-life segments, e.g., distribution, power transmission and telecommunication, CPSs stimulates human-to-human interaction via this regulatory measure Information security is a critical concern in today's technological world. Due to the complexity of the components and middleware in CPS, it is difficult to keep them safe from cyberattacks while yet allowing them to operate quickly and effectively. An in-depth explanation of CPS, their issues (including cyber threats), characteristics, and associated technology is provided in this paper Aside from security and performance, we also describe the prevalent Side Channel Attacks (SCA) e.g., Differential Power Analysis (DPA) and Simple Power Analysis (SPA), on cryptographic techniques (such as RSA and AES) and the countermeasures that may be used to protect against these attacks.