On one hand, single sign-on is a boon because it gives users quick access to lots of resources without having to remember dozens of different passwords. On the other hand, a bad guy who steals individual passwords gains access to one application; a bad guy who steals your single sign-on credentials gains the keys to the kingdom.
With this latter point in mind, I've generally avoided consolidating my online identity, preferring the "multiple personality" approach that allowed me to use different passwords, different security questions, and even different names and birth dates on different systems. Better to be Steve Austin on one site and Clark Kent on another, I felt, than to make myself vulnerable on both sites at the same time.
Recently, however, I've begun to rethink this strategy. For one thing, maintaining multiple personalities is a pain in the neck. Trying to remember your username, password, and security questions is hard enough when you're one person. When you're Sybil and have 13 different personalities, it's nigh unto impossible.
For another thing, the technology is getting better. Password management and consolidation tools such as KeePass and LastPass are becoming more reliable and secure, and many of them offer a form of second-factor authentication that actually improves security.
New initiatives, such as the FIDO Alliance discussed in our main story in today's newly published Dark Reading digital issue on Web authentication, offer the promise of using a single interface for many different systems and applications, and take advantage of the most secure authentication tools available for each system.
More important than either of these points, however, is the fact that so much of the world is becoming Web-connected. Increasingly, who we are is defined by what we do on the Web. Google knows that I'm a security person, so it offers me search results that are slanted in that direction. Facebook offers me security-related ads, and LinkedIn tells me about security people I might want to connect with. There are advantages to having a single online identity, and those advantages will increase as Web technology improves and the promise of "Internet personalization" becomes reality.
Then again, the security person in me resists this idea. Do I really want Google, Facebook, and other sites collecting information about my online background and surfing habits? I find that increasingly -- if it can be done securely -- my answer is often yes. While I don't want websites to have all of my information, and while I believe all users should have the option to opt out, I am increasingly opting in. Having a single identity enables me to meet more people and do more things on the Web, and faster, than I could as Clark Kent and Steve Austin.
It's still a trade-off, but the costs and benefits of that trade are shifting. If the technology continues to improve, then it might soon be safer for all of us to be one person on the Web, instead of many.