Engineering Graphical Captcha and AES Crypto Hash Functions for Secure Online Authentication
Password alone is not trusted for user online authentication since mere password cannot give full surety of proper access control. The authentication of the users is one of the key areas in research and practice in the domain of e-security. The threats from hackers are also growing and therefore need for a highly efficient defense safeguard protection against hackers and unauthorized users. The different password entering techniques create problems related to usability and inherent security issues, whereas CAPTCHA techniques came into picture to boost up security via automated assistance. This CAPTCHA automated test is to be built qualified by real humans but not by a computer program. Such CAPTCHA program can be used to distinguish between humans and robots. This CAPTCHA has many applications in the online security domain which is merged with encrypted hash function as accommodating advantages of retaining the facility of the graphical password schemes. This paper proposes engineering an authentication technique using graphical CAPTCHA with an AES encrypted hash password to maintain an applicable security accessing systems. We proposed three layered security system that joins highly efficient security mechanisms to avoid users stress of entering password many times or different other hectic routines in order to save account accessing. This engineering authentication technique includes modules of CAPTCHA combined with SHA2 cryptography to efficiently improve the online security showing fast attractive remarks as compared to related systems.