Although slightly ahead of its time for the masses there are implementations which do not require you to carry another device. You can use your telephone and b

Although slightly ahead of its time for the masses there are implementations which do not require you to carry another device. You can use your telephone and be provided with your second factor via voice, sms or application running on your smartphone. For example: http://googleblog.blogspot.com/2011/02/advanced-sign-in-security-for-your.html http://googleblog.blogspot.com/2011/02/advanced-sign-in-secu...