Re: If CAPTCHA isn't the answer. What is?

Require everyone who wishes to visit your web site to apply, in person, for a web key. Surgically embed a key-generating mini-computer just under their skin. Rig it to explode if tampered with.

That should be reasonably tamper-proof. You may have a few user-acceptance issues to work out, however...

Comment on Re: If CAPTCHA isn't the answer. What is?

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Re^2: If CAPTCHA isn't the answer. What is? by chromatic (Archbishop) on Aug 01, 2006 at 23:21 UTC
One problem with biometric systems is that they only work while you still have that body part.	[reply]
Re^3: If CAPTCHA isn't the answer. What is? by Anonymous Monk on Aug 02, 2006 at 00:55 UTC
If the device is rigged to explode when the body part is captured, then it neatly solves the entire problem. No end user == no end user complaints! ;-)	[reply]