Do You Really Need to Change Your Passwords Every Three Months? Short answer: Yes. Here's why.

Q: Do I really need to change my passwords every three months?

A: Yep. Let's face it, when it comes to online security, the weakest link is our collective refusal to create, memorize and change our passwords every 90 days, as the National Security Agency's Systems and Network Analysis Center suggests.

The only solution is to use a different password for every single site you visit, according to Tara Kelly, who co-founded Passpack, a web-based password-management provider that was later sold to Utah-based Kemesa Holdings. With the surplus of sites we enter on a daily basis, the only way to remember all that information is to not have to remember it at all.