Google, while announcing its new Chrome operating system late Tuesday, said users would no longer have to worry about viruses, malware and security updates, but security experts disagreed on whether Google can deliver on those promises.

When security expert Bruce Schneier tried to sell a used laptop on eBay, he thought it would be easy. Instead, a sale was aborted twice -- first by a scammer using a hacked eBay account and then by a buyer who tried to trick Schneier into sending her the laptop after she cancelled payment.

Unless you're a dyed in the wool cryptographic geek you probably didn't know that there was a Crypto conference, or even a chain of worldwide crypto conferences that take place each year. Fortunately, for the most of us that aren't crypto geeks there are a handful of very highly skilled people who are; they can take the highly theoretical and complex mathematical proofs and arguments that make up most of modern cryptographic and cryptanalytic research and put it into plain language.

They're "security myths", oft-repeated and generally accepted notions about IT security that arguably are simply not true - in order words, it's just a myth. We asked security experts, consultants, vendors and enterprise security managers to share their favorite "security myths" with us. Here are 13 of them.