Death to passwords! New Yahoo Mail protects with push notifications instead

Yahoo began its assault on the password in March with SMS-based two-factor authentication, and now the company wants to finish what it started. On Thursday, Yahoo announced Yahoo Account Key, a password-less method of logging in to Yahoo Mail that will roll out to other Yahoo services in the coming months.
Account Key effectively works like two-factor authentication, allowing you to authorize new logins via your smartphone or tablet. The only difference is Account Key is not a secondary back-up