Your web service may contain personal, financial or other sensitive data, which are supposed to be handled securely. To protect your users' information one of the best methods is to offer them two-factor authentication, which means adding a variable password (one time password or OTP) to their ordinary username/password combination (or OpenID credentials). You can offer this defense mechanism right at the sign-in process or at a certain part of your software, where the users get to see the secured information or initiate a transaction. Our website offers you an inexpensive answer to the problem. We deliver OTP functionality on cell phones or tokens with a server system, which can be seamlessly and easily integrated to your website by webservice calls.