Greg Broiles wrote:
At a very basic level, anonymous (not pseudonymous, like the remailers are) messages are *cheaper*, because they carry less information; they do not need to send the bits which identify the sender.
I think the meaning of "anonymous" here is clearly with respect to _traffic analysis_. The "cost of anonymity" is with respect to the costs and delays of using digital mixes (remailers)). The relatively few bytes of header information don't affect the cost in any substantive way.
This conversation seems to elide distinctions between low-level anonymity (where source information is simply not transmitted) and high-level anonymity, where source information is transmitted but is not used for social or political reasons.
Again, traffic analysis is the issue. (And I don't necessarily mean NSA-type traffic analysis...Net-savvy investigators can trace messages back to origins even when a message is ostensibly anonymous. So far as I know, some form of mix/remailer is needed to ensure anonymity.))0
A multi-hop message where the "From:" line changes with each hop costs almost precisely what a multi-hop message would cost without the "From:" line changes. Folks feeling detail-oriented can calculate the cost of the CPU time to strip header information vs. the cost of sending that header information to the next hop. I don't care about the answer, so I'm not going to.
??? This is not the "cost" that is being discussed. Stripping or changing headers is a trivial cost compared to the latency delays that may result when mix reordering is done (how much latency is involved is a function of several things, including reordering desired ("N"), amount of other traffic).
Anonymous video conferencing is available now; go to Kinko's, pay cash for the use of their video conference room. Or, ask/convince the recipient to consider the conversation "off the record".
Neither of these kinds of "anonymity" are cryptographically interesting, or strong. --Tim May -- .......................................................................... Timothy C. May | Crypto Anarchy: encryption, digital money, tcmay@netcom.com | anonymous networks, digital pseudonyms, zero | knowledge, reputations, information markets, W.A.S.T.E.: Aptos, CA | black markets, collapse of governments. Higher Power: 2^859433 | Public Key: PGP and MailSafe available. Cypherpunks list: majordomo@toad.com with body message of only: subscribe cypherpunks. FAQ available at ftp.netcom.com in pub/tc/tcmay