Some posters have speculated that it might be possible to get a phone, swap it with someone else, and then the feds would not be able to get the correct key-pair. An other poster assumed that each clipper chip would send out some sort of Clipper-ID in plain-text before and/or during and/or after a session. Which causes me to further speculate that it may be possible to filter out these plain text messages. (They are probally built in to the exchange of keys ritual and so can't be filtered out without preventing the Clipper to do it thing...). If they can be filter, filtering them may either be an out right criminal act or be considered probally cause for a warrent to determine why you are filtering them out, etc. -- Harry Shapiro habs@panix.com List Administrator of the Extropy Institute Mailing List Private Communication for the Extropian Community since 1991