Google TOTP Two-factor Authentication for PHP | Application SecurityAt the beginning of the year Google released 2 Factor Authentication (2FA) for G-Mail providing an application for Android, IPhone and Blackberry called Google Authenticator to generate one time login tokens. This post will show how to implement Google 2FA to protect web applications from stolen credentials. Google Authenticator is based on RFC 4226 - a Time based One Time Password (TOTP) which is
