Provided security is not the selling feature of your product, I'd say use a simple and effective 6 digit RSA token generator. http://www.mygaming.co.za/news/PC/

Provided security is not the selling feature of your product, I'd say use a simple and effective 6 digit RSA token generator. http://www.mygaming.co.za/news/PC/4428-World-Warcraft-look-the-Battlenet-authenticator.html http://www.mygaming.co.za/news/PC/4428-World-Warcraft-look-t... http://bnetauth.freeportal.us/specification.html http://bnetauth.freeportal.us/specification.html