Abstract: According to the invention, a system and an apparatus to use the One-Touch button on a mobile hand-held device to generate one time passwords (OTP) are disclosed. Components of this system comprise: a mobile hand-held device, a built-in One-Touch button on the mobile device, a Global Authentication Server, and an OTP Generation engine installed and ran on the mobile device. The mobile device user only needs to push the One-Touch button and an OTP is generated. The OTP is generated on the mobile device by the OTP generation engine after a secure key exchange process is performed between the remote Global Authentication Server and the mobile device. The mobile device is registered to use online web services that recognize the OTP through the Global Authentication Service. Online web services require that the user enter a combination of the user's known password and OTP for identity assurance.