I always enjoy browsing through password-related patents to see all the flawed, silly, or outright dumb ideas that people come up with in an attempt to improve how we authenticate ourselves in the digital realm. What amazes me though is how many patents I encounter that have been granted for some of the most obvious, well-known and ordinary techniques we use in the authentication process. In fact, every imaginable aspect of password selection, authentication, storage, and recovery seems to be covered by one or more patents.
As the title says, the process of checking for common or weak passwords is patented. In fact, it is covered by quite a few patents