Introduction- Telephone
Eric Hughes
hughes at ah.com
Mon Sep 12 09:28:16 PDT 1994
When you have an untappable wire
between the sender and recipient, then traffic analysis is impossible (and
crypto unnecessary).
Yet you can create an untappable wire with cryptography! The device
in question is called a link encryptor. Take a stream cipher and run
it continuously across the channel in question. Pad the asynchronous
traffic when it's not flowing and add some synchronization to both the
stream and the data insertion.
You can tap the physical line still, but the interceptions reveal zero
information (computationally--the stream cipher _is_ keyed, after
all).
A good project would be virtual link encryptors for the Internet.
Eric
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