On Monday, June 15, LastPass officials warned that attackers have compromised servers that run the company's password management service and made off with some master passwords of users of the LastPass service.
You can read more detail about the attack here: http://arstechnica.com/security/2015/06/hack-of-cloud-based-lastpass-exposes-encrypted-master-passwords and here: https://blog.lastpass.com/2015/06/lastpass-security-notice.html/
There's lots of jargon in those article about algorithms, encryption, hashes, anomalies, multifactor authentication, vault contents, SHA's and GPU's. Enough to make your head spin! Here's the bottom line: the passwords you store on ...