Cryptographic protocol design demonstrates untraceable electronic communication across unsecured networks, suggesting robust privacy without requiring trusted central authorities.
A technique based on public key cryptography is presented that allows an electronic mail system to hide who a participant communicates with as well as the content of the communication--in spite of an unsecured underlying telecommunication system. The technique does not require a universally trusted authority. One correspondent can remain anonymous to a second, while allowing the second to respond via an untraceble return address.
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David Chaum (1981) studied this question.
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