As mentioned many times, passwords are usually the first point for network security, something that everybody uses.
So, it isn't surprising that there has been a lot of advice out there regarding passwords -- how often to change them, mixing letters and numbers, don't use something too obvious, and so on.
Now an article on BBC.com has called for yet another password change:
According to the article:
A team led by Richard Boyd from the Georgia Tech Research Institute has been investigating what effect the number-crunching power of modern graphics cards could have on the crackability of passwords. The parallel processing systems inside graphics cards are very good at carrying out so-called "brute force" attacks that effectively try every possible combination of letters and numbers until the right one is found. Longer passwords take longer to crack and offer better protection, say the researchers.
Are longer passwords the answer to improved security? Perhaps for a little while. I remember when passwords only needed to be four characters long -- and it wasn't all that long ago. It makes me wonder how long it will be before we are looking at 15 or 20 character passwords. As the BBC article said:
Ultimately, suggest the researchers, users may be forced to rely on whole sentences that are a mix of different sorts of characters to ensure no-one else can guess their password and get at online services.