Katzenpost: Traffic analysis resistant messaging

grarpamp grarpamp at gmail.com
Fri Nov 23 00:52:19 PST 2018


“An especially problematic excision of the political is the
marginalization within the cryptographic community of the
secure-messaging problem, an instance of which was the problem
addressed by David Chaum. Secure-messaging is the most fundamental
privacy problem in cryptography: how can parties communicate in such a
way that nobody knows who said what. More than a decade after the
problem was introduced, Rackoff and Simon would comment on the
near-absence of attention being paid to the it.” (Phillip Rogaway, The
Moral Character of Cryptographic Work)

    to prevent a sufficiently global passive adversary from learning
who is communicating with whom
    to detect active attacks against the network infrastructure
    hide message content from participating providers, hide recipient
identity from the sender’s provider, and the sender identity from the
recipient’s provider
    reliable out of order delivery
    support for various “message based” use cases like ‘instant
messaging’, ‘e-mail’, and ‘crypto currency’ anonymization

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