Seems this idea was discussed by the group recently with the conclusion that it was unlikely to work.
Apparently, it is already "commercialized" and in use:
formatting link
The marketers have your ear - The Boston GlobeAny ideas about how it works?
Chuck
----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----
formatting link
The #1 Newsgroup Service in the World! 120,000+ Newsgroups----= East and West-Coast Server Farms - Total Privacy via Encryption =----