Yahoo's next step in password security is to eliminate them altogether.
Starting on Thursday, the company announced, users of the Yahoo Mail app on both iOS and Android will have access to a new service called Yahoo Account Key, which uses smartphones to verify identities in lieu of traditional passwords.
Here's how it works: When users who sign up for Account Key try to access Yahoo Mail, they will no longer need to enter their password. Instead, the Account Key service will send a message to the smartphone connected to the account.
With a tap on yes or no, users can indicate it is a legitimate attempt to get into the account or deny unauthorized access.