…Within hours of anonymous hackers penetrating Gawker servers and exposing cryptographically protected passwords for 1.3 million of its users, botnets were cracking the passwords and using them to commandeer Twitter accounts and send spam. Over the next few days, the sites advising or requiring their users to change passwords expanded to include Twitter, Amazon, and Yahoo.

…The ancient art of password cracking has advanced further in the past five years than it did in the previous several decades combined. At the same time, the dangerous practice of password reuse has surged. The result: security provided by the average password in 2012 has never been weaker.