Number lock

For an extra charge, AOL offers a gadget that displays a six-digit code that changes from minute to minute for more secure logins | Chris Stamper

America Online now offers something more than passwords to protect user accounts. For an extra charge, AOL offers a gadget that displays a six-digit code that changes from minute to minute.

These matchbook-sized devices, made by RSA Security, resemble those often used on sensitive corporate or institutional networks. A user must enter the six-digit code displayed on the device to login—and the number changes often enough to discourage eavesdroppers and snoops.

These optional security codes will not affect all internet access. They only protect AOL's proprietary online service, not outside websites. Curiously, AOL Instant Messenger will also be unprotected.

The extra service costs $1.95 per month, plus a one-time $9.95 fee. AOL hopes to attract a niche group of subscribers—small-business owners, identity-theft victims, and those who make many online transactions—for the premium service. The move could spur other major internet service providers to follow suit, possibly with their own numeric codes, fingerprint scanners, or smart cards.