Cell phones, smart cards, and health monitoring gadgets are just a few examples of the numerous battery-powered embedded systems utilized to access, alter, and store sensitive and complicated data today. Users are concerned about the protection of their identity credentials, their software packages, and their information. These systems make considerable use of cryptographic algorithms to implement security measures. Many cryptographic algorithms do calculations that are hard to compute and waste a huge amount of energy as a result. In this study, the energy consumption of serial and parallel cryptography algorithms is analyzed. Using an eight-core parallel system and Joule metre (Microsoft's Research Tool), we were able to reduce energy consumption in comparison to sequential algorithms with promising results. The study says that low-frequency symmetric multiprocessors have shown promising results and can make a big difference in green computing, which would be good for society as a whole.