I2P

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Original author(s)	I2P Team[1]
Initial release	2003; 21 years ago (2003)
Stable release	2.5.0[2]  / 8 April 2024; 3 days ago (8 April 2024)
Repository	github.com/i2p/i2p.i2p
Written in	MIT
Website	geti2p.net

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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 "I2P node". I2P is free and open sourced, and is published under multiple licenses.^[5]

Technical design

I2P has been

On the website it states, that "funding for I2P comes entirely from donations".[59] Admins and managers of the project said, that "the core project itself doesn't take donations". These should instead go to secondary applications or be spent on hiring others, to work on I2P.^[60] Support for the onboarding for I2P came from the Open Technology Fund.^[61][62] In contrast to The Tor Project, I2P has "not the financial or legal infrastructure to support a network of exit nodes".^[63] The reseed servers,^[64] a sort of bootstrap nodes,^[65] which connect the user with the initial set of peers to join the I2P-network, should be run by volunteers.^[66]

Software

Since I2P is an anonymizing network layer, it is designed so other software can use it for anonymous communication. As such, there are a variety of tools currently available for I2P or in development.

The I2P router is controlled through the router console, which is a web frontend accessed through a web browser.

General networking

• I2PTunnel is an application embedded into I2P that allows arbitrary TCP/IP applications to communicate over I2P by setting up "tunnels" which can be accessed by connecting to pre-determined ports on localhost.
• SAM (Simple Anonymous Messaging) is a
  protocol which allows a client application written in any programming language to communicate over I2P, by using a socket-based interface to the I2P router.^[67]
• BOB (Basic Open Bridge) is a less complex app to router protocol similar to "SAM"[68]
• Orchid Outproxy
  Tor plugin^[69]

• Several programs provide
  Robert (P2P Software) is the most actively maintained I2PRufus fork. XD is a standalone BitTorrent client written in Go.^[74]
  BiglyBT is a bittorrent client based on Vuze which also allows the use of i2p for downloading/seeding.
• Two Kad network clients exist for the I2P network, iMule and Nachtblitz. iMule (invisible Mule) is a port of eMule for I2P network. iMule has not been developed since 2013. iMule is made for anonymous file sharing. In contrast to other eDonkey clients, iMule only uses the Kademlia for proceeding to connect through I2P network, so no servers are needed. Nachtblitz^[75] is a custom client built on the .NET Framework. The latest version is 1.4.27, released on March 23, 2016. Nachtblitz includes a time lock to disable the software one year after its release date.
• I2Phex is a port of the popular Gnutella client Phex
  to I2P. It is stable and fairly functional.
• Tahoe-LAFS has been ported to I2P. This allows for files to be anonymously stored in Tahoe-LAFS grids.
• MuWire is a file-sharing program inspired by the LimeWire Gnutella client that works atop the I2P network.^[76]

Bridging to clearnet

Currently, Vuze and BiglyBT are the torrent clients that make clearnet (connections not through I2P) torrents available on I2P and vice versa. Depending on the client settings, torrents from the internet can be made available on I2P (via announcements to I2P's DHT network) and torrents from I2P can be made available to the internet. For this reason, torrents previously published only on I2P can be made available to the entire Internet, and users of I2P can often download popular content from the Internet while maintaining the anonymity of I2P. As of August 2022, the default outproxy is exit.stormycloud.i2p which is run by StormyCloud Inc.^[77][78][79]

Email

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• I2P-Bote is a free, fully
  latency mail route and the storing nodes will know to whom (which I2P-Bote address – the user's IP address is still hidden by I2P) the mail is destined. The original sender could have gone offline long before the email becomes available to the recipient. No account registration is necessary, all you have to do in order to use it is create a new identity. I2P-Bote can be installed as an I2P plugin .^{[citation needed}
  ]
• I2P also has a free pseudonymous e-mail service run by an individual called Postman. Susimail is a
  web-based
  email client intended primarily for use with Postman's mail servers, and is designed with security and anonymity in mind. Susimail was created to address privacy concerns in using these servers directly using traditional email clients, such as leaking the user's hostname while communicating with the SMTP server. It is currently included in the default I2P distribution, and can be accessed through the I2P router console web interface. Mail.i2p can contact both I2P email users and public internet email users.
• Bitmessage.ch can be used over I2P^{[citation needed]}

Instant messaging

• I2P-Messenger is a simple
  instant messenger for I2P.^[81] No servers can log the user's conversations. No ISP can log with whom the user chats, when, or for how long. As it is serverless, it can make use of I2P's end-to-end encryption, preventing any node between two parties from having access to the plain text. I2P-Messenger can be used for fully anonymous instant communication with persons the user doesn't even know, or, alternatively, to communicate securely and untraceably with friends, family members, or colleagues. In addition to messaging, file transfer
  is also supported.

• network resilience. It supports connections to I2P, the Tor network (Syndie does not support Socks proxies, workaround needed for Tor access), Freenet and the regular internet. Server connections are intermittent, and support higher-latency communications. Connections can be made to any number of known servers. Content is spread efficiently using a Gossip protocol
  .
• Aktie is an anonymous file sharing and distributed Web of trust forums system. Aktie can connect to I2P with its internal router or use an external router. To fight spam, "hash payments" (proof of CPU work) is computed for every published item.

Routers

• I2PBerry is a Linux distribution which can be used as a router to encrypt and route network traffic through the I2P network.
• i2pd is a light-weight I2P router written in C++, stripping the excessive applications such as e-mail, torrents, and others that can be regarded as bloat.^[82][83]
• Kovri is an I2P router written in C++.
  Monero to send new transaction information over I2P, making it much more difficult to find which node is the origin of a transaction request.^[86] Those using the Kovri router will be running full I2P routers that contribute to the I2P network the same way the current Java router does. This project is expected to benefit both the Monero and I2P communities, since it will allow for greater privacy in Monero, and it should increase the number of nodes on the I2P network.^[87]

The Privacy Solutions project

The Privacy Solutions project,[88] a new organization that develops and maintains I2P software, launched several new development efforts designed to enhance the privacy, security, and anonymity for users, based on I2P protocols and technology.

These efforts include:^[89]

• The Abscond browser bundle.
• i2pd,^[90] an alternate implementation of I2P, written in C++ (rather than Java).
• The "BigBrother" I2P network monitoring project.

The code repository and download sections for the i2pd and Abscond project is available for the public to review and download.^[91] Effective January, 2015 i2pd is operating under PurpleI2P.^[92]

Android

• Release builds of an I2P Router application for Android can be found on the Google Play store under The Privacy Solutions Project's Google Play account or on an F-Droid repository hosted by the developers.^[93]
• Nightweb is an Android application that utilizes I2P and Bittorrent to share blog posts, photos, and other similar content. It can also be run as a desktop application. It is no longer in development.^[94]

Cryptocurrency

Some cryptocurrencies that support I2P are listed below.

• Bitcoin^[95]
• Monero
• Verge

Terminology

Eepsite

Eepsites are websites that are hosted anonymously within the I2P network. Eepsite names end in .i2p, such as ugha.i2p or forum.i2p. EepProxy can locate these sites through the cryptographic identifier keys stored in the hosts.txt file found within the I2P program directory. Typically, I2P is required to access these eepsites.^[97]

.i2p

'I2p' is a pseudo-top-level domain which is only valid within the I2P overlay network scope. .i2p names are resolved by browsers by submitting requests to EepProxy which will resolve names to an I2P peer key and will handle data transfers over the I2P network while remaining transparent to the browser.^[98]

EepProxy

The EepProxy program handles all communication between the browser and any eepsite. It functions as a proxy server that can be used by any web browser.

Peers, I2P nodes

Other machines using I2P that are connected to user's machine within the network. Each machine within the network shares the routing and forwarding of encrypted packets.

Tunnels

Every ten minutes, a connection is established between the user's machine and another peer. Data to and from the user, along with the data for other peers (routed through the user's machine), pass through these tunnels and are forwarded to their final destination (may include more

jumps).^[99]

netDb

The distributed hash table (DHT) database based on the Kademlia algorithm that holds information on I2P nodes and I2P eepsites. This database is split up among routers known as "floodfill routers". When a user wants to know how to contact an eepsite, or where more peers are, they query the database.^[100][97]

Vulnerabilities

Denial of service attacks are possible against websites hosted on the network, though a site operator may secure their site against certain versions of this type of attack to some extent.^[101][102]

A

zero-day vulnerability was discovered for I2P in 2014, and was exploited to de-anonymize at least 30,000 users. This included users of the operating system Tails.^[103] This vulnerability was later patched.^[104][105]

A 2017 study examining how forensic investigators might exploit vulnerabilities in I2P software to gather useful evidence indicated that a seized machine which had been running I2P router software may hold unencrypted local data that could be useful to law enforcement. Records of which eepsites a user of a later-seized machine was interested in may also be inferred. The study identified a "trusted" I2P domain registrar ("NO.i2p") which appeared to have been abandoned by its administrator, and which the study identified as a potential target for law enforcement takeover. It alternatively suggested waiting for NO.i2p's server to fail, only to social engineer the I2P community into moving to a phony replacement. Another suggestion the study proposed was to register a mirror version of a target website under an identical domain.^[102]

I2PCon

From August 15, 2015 to August 16, 2015 an I2P convention was held in Toronto, Ontario.^[106] The conference was hosted by a local hackerspace, Hacklab. The conference featured presentations from I2P developers and security researchers.

See also

• Crypto-anarchism
• Deep web
• Darknet
• Garlic routing
• Key-based routing
• Public-key cryptography
• Rendezvous protocol
• Secure communication
• Threat model

Software

• Freenet
• Mixnet
• Retroshare
• Tor
• Tribler
• ZeroNet

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External links

• Official website