How secure is Steam Guard? Valve's Gabe Newell must think it's pretty darn airtight, because he posted his Steam account email and password for the world to see during GDC.
Perhaps this isn't the best publicity stunt to employ. The theft of Half-Life 2'ssource code was called "easy" by the man responsible. Newell's ploy mimicks the one used by LifeLock, a security company that published its CEO's social security number in advertising.
The guy's identity has been stolen at least thirteen times since the ad campaign.