A system and method for authentication including verifying a password is disclosed. In one embodiment, the authentication system includes a first storage unit to store an authentication sequence, a read-only memory unit to store an authentication algorithm, and a second storage unit. A microcontroller is coupled to the first storage unit, the read-only memory unit, and is configured to be coupled to and uncoupled from a host. The microcontroller is configured to execute the authentication algorithm to verify a password with the authentication sequence, and to send an access request to a web server via the host if the authentication algorithm has verified the password with the authentication sequence.