Hash-based data structures

daemon and utilities for an anonymizing network

associates data values with key values - a lookup table

The Invisible Internet Project (I2P) is an anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication. Anonymous connections are achieved by encrypting the user's traffic (by using end-to-end encryption), and sending it through a volunteer-run network of roughly 55,000 computers distributed around the world. Given the high number of possible paths the traffic can transit, a third party watching a full connection is unlikely. The software that implements this layer is called an "I2P router", and a computer running I2P is called an "I2

Gnutella is a peer-to-peer network protocol. Founded in 2000, it was the first decentralized peer-to-peer network of its kind, leading to other, later networks adopting the model.

content-addressable, peer-to-peer hypermedia distribution protocol

decentralized distributed system that provides a lookup service similar to a hash table

precomputed table for reversing cryptographic hash functions

hashing-based data structure for maintaining a set of items in limited memory, allowing false positives but no false negatives

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distributed, decentralized P2P infrastructure