JASM is a model designed to increase the security level in authentication systems. It uses IP Address of the user in the authentication process to enhance the security. On-line security plays a vital role to prevent users sensitive data from falling into wrong hands. JAsta Security Model (JASM) can be used for providing higher degree of security to system/application where user's authentication is required. By using this model, the problem of phishing can be solved to a greater extent. This model can be deployed in banking systems, mailing systems, and in high security zones.