PORTLAND -- Do you have a Yahoo password? You're going to want to change it after another massive security breach.

Yahoo announced the breach Thursday night, but has not said how many email accounts have been compromised.

Security experts say in addition to changing your password, there's another step you should take to protect your accounts, no matter which apps or email system you use.

It's called 2 factor authentication and it's one of the best things you can do to protect your online accounts. Nearly all free email services offer it, so do social media sites like Facebook and Twitter, as well as most financial institutions.

Basically, it means the site you're on gives you a unique pin number that you use to log into their site on every computer or mobile device you use. That's in addition to the normal password you use.

Security experts say it's an added layer of protection that can make a huge difference in today's world of cyber criminals.

There are data breaches we haven't even heard about where your data has already been compromised and you don't know about it because it hasn't been disclosed, said Internet security expert Ken Westin with Tripwire Inc. in Portland.

Westin also recommends that you change your account passwords every 3 months and use different passwords for each of your online accounts.

Yahoo has not announced how many email accounts were compromised. The company recommends everyone with a Yahoo account change their password right away.

While you're doing that, why not set up 2 factor authentication as well? Yahoo calls it second sign up verification , but it's the same thing and you can sign up for it by logging into your account and then going to security settings.

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