Hey everyone,
We've now added an account security feature you can opt into from your My Account page, head to the "Username, Password & Security" tab and go to the new "Security Settings" page, here's a direct link:
Forum/ucp.php?i=profile&mode=security
When you turn this feature on, when you log in from a new computer that you haven't used before we'll send you an email with a 5 digit code you'll need to enter to complete your login.
This protects your account because it means that if some random person on the internet figures out your password, they still won't be able to log into your CS account because they'll be logging in from a new computer. And you'll be alerted by receiving an unexpected email with a confirmation code, so you'll be able to change your password to protect your account (and change it on other websites too if you use the same password across multiple sites).
This feature is currently opt-in, but our goal is to gradually enable it for all CS accounts.