Re: News Flash: Clipper Bug?

Peter Wayner says:

...

My friend Matt Blaze at Bell Labs showed that you can forge LEAFs on Tessera cards so that you can use Skipjack without anyone being able to get the key you are using. Its a slick piece of work -- slick enough that it made the front page of today's New York Times. I'm not sure how practical it is, but its extraordinarily noteworthy.

Please explain how to forge the LEAFs. I presume that this doesn't involve super-encryption.

I'll see if I can get Matt to send an explanation himself. Perry