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An 80-story building in Dubai will feature floors that spin around the building’s central axis, using electric motors powered by wind and solar energy.

Occupants can control their floor through a voice command system, although this demonstration video implies that the rotation will be centrally controlled. I would have used the Clapper, myself.

The building looks like it is doing a hula, although in real life, the floors would move very slowly.

I can only wonder what the Outdoor Circle might say if a similar building were proposed on Oahu. Similar towers have been proposed for Moscow and Manhattan. The Dubai project is scheduled for completion in 2010.

There’s more information at architect David Fisher’s web site, this CNN article titled Dubai ‘shape-shifting skyscraper’ unveiled and in Dynamic Tower Skyscraper: Every Floor Self-Rotates, Powered by Wind and Sun at Gizmodo.

The mobile phone is an excellent device for two-factor authentication. Most Internet users already have a mobile phone. A user might not notice that they’ve lost a dongle. security token or smartcard. That’s one reason adoption has been difficult for multifactor authentication schemes.

JanRain announced on 9 May 2008 that it is launching a phone-based multifactor authentication service, CallVerifID, that works with its myOpenID service.

The phone verification service lets a user designate a specific phone number that JanRain’s partner, PhoneFactor, will call when their username requires verification. The user can press the pound (#) key on the phone to confirm the login, or use the incoming call to report that their username has been compromised.

Users can designate a mobile or landline number for their verification calls by setting up their myOpenID account preferences with the appropriate number.

The system isn’t perfect. Someone could still learn the users OpenID URL and passphrase, and arrange to intercept the confirmation phone call somehow. This might take a greater level of physical access than stealing a security key or snooping a keyboard. The call verification system could easily be improved by asking the user to enter or speak a second passphrase on the phone.

As Chris Messina pointed out in December 2007, several large Internet content companies have announced that they will support OpenID. Their implementation has been delayed. for several reasons, including branding, although ma.gnolia finally came through in March 2008.

CallVerifID is more evidence that OpenID can become a trusted authentication platform for content and blogging sites, and perhaps for e-commerce sites as well.

See CenterNetworks and Mashable and for more details.

Mobile phone image courtesy of besto-Baker on Flickr, through a Creative Commons license.

Related posts and pages on billso.com

• OpenID
• 10 May 2008: Why use OpenID?
• 30 April 2008: Updating WP-OpenID to support ID Selector