—SecurID tokens have been developed by SDTI/RSA Security to authenticate users to a corporate network infrastructure. Although, thus authorization approach could be efficiently applied to modern networks such as wireless and mobile. In this work, two different architectures and their integrations on silicon, are proposed for SecurID Authenticator. Both proposed designs are compared with the conventional one, in terms of operating frequency, allocated area resources, and throughput values. More analytically, the paper presents two alternative design solutions and efficient implementations for SecurID Authenticator: the first is suitable for high speed communications, while the second supports minimized area applications. Both proposed architectures could be used alternatively to communication networks, in order to ensure high level of security, with special needs for high speed or small area resources, respectively.