Anonymity and deniability in distributing information are two of the goals of the GNUnet project. At its heart, GNUnet is a mechanism to share content with others without revealing who generated the content or who accessed it. It also provides intermediate nodes in the network with the ability to deny knowledge of the contents of any traffic they forward because they are unable to decrypt it.
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stargrave
15 years 4 weeks 3 days 42 min ago
More info in comments
There is much more useful information in their comments. Mainly about GNUnet's main difference from other P2P networks.