Estimations show that modern cars have about 100 million lines of code. By 2030, this number is expected to quadruple. To put this in perspective, an operating system for a PC can include up to 40 million lines of code, but a passenger airplane typically contains roughly 15 million lines. The exponential rise in complexity of automotive software high-lights the urgent need for improved cybersecurity solutions to reduce the danger of cyberattacks and guarantee the security of drivers and passengers. To resolve this issue there are few of the cryptographic algorithms used such as Advanced Encryption Algorithm (AES) for the faster and reliable execution multiple iterations are done in the paper we will look into the process and outcomes of AES in automotive secure boot. IEEE Keywords: Codes, Operating systems, Software algorithms, Estimation, Software, Software reliability, Encryption, Complexity theory, Computer crime, Information technology. Author Keywords: Secure Boot, Automotive cybersecurity, Cryptographic algorithms, AES Algorithm.