Projeto Internet Invisível (I2P)

What is I2P?

The Invisible Internet Project (I2P) is a fully encrypted private network layer that has been developed with privacy and security by design in order to provide protection for your activity, location and your identity. The software ships with a router that connects you to the network and applications for sharing, communicating and building.

I2P Se Preocupa Sobre Privacidade

I2P esconde o servidor do usuário e o usuário do servidor. Todo o tráfego I2P é interno à rede I2P. O tráfego dentro do I2P não interage diretamente com a Internet. É uma camada no topo da Internet. Ele usa túneis unidirecionais criptografados entre você e seus pares. Ninguém pode ver de onde vem o tráfego, para onde ele vai, ou qual é o conteúdo. Além disso, I2P oferece resistência ao reconhecimento e bloqueio de padrões por censores. Como a rede depende dos pares para encaminhar o tráfego, o bloqueio de localização também é reduzido.

How to Connect to the I2P Network

The Invisible Internet Project provides software to download that connects you to the network. In addition to the network privacy benefits, I2P provides an application layer that allows people to use and create familiar apps for daily use. I2P provides its own unique DNS so that you can self host or mirror content on the network. You can create and own your own platform that you can add to the I2P directory or only invite your friends. The I2P network functions the same way the Internet does. When you download the I2P software, it includes everything you need to connect, share, and create privately.

An Overview of the Network

I2P uses cryptography to achieve a variety of properties for the tunnels it builds and the communications it transports. I2P tunnels use transports, NTCP2 and SSU, to hide the nature of the traffic being transported over it. Connections are encrypted from router-to-router, and from client-to-client(end-to-end). Forward-secrecy is provided for all connections. Because I2P is cryptographically addressed, I2P addresses are self-authenticating and only belong to the user who generated them.

I2P is a secure and traffic protecting Internet-like layer. The network is made up of peers ("routers") and unidirectional inbound and outbound virtual tunnels. Routers communicate with each other using protocols built on existing transport mechanisms (TCP, UDP, etc), passing messages. Client applications have their own cryptographic identifier ("Destination") which enables it to send and receive messages. These clients can connect to any router and authorize the temporary allocation ("lease") of some tunnels that will be used for sending and receiving messages through the network. I2P has its own internal network database (using a modification of the Kademlia DHT) for distributing routing and contact information securely.

About Decentralization and I2P

The I2P network is almost completely decentralized, with exception to what are called "Reseed Servers," which is how you first join the network. This is to deal with the DHT ( Distributed Hash Table ) bootstrap problem. Basically, there's not a good and reliable way to get out of running at least one permanent bootstrap node that non-network users can find to get started. Once you're connected to the network, you only discover peers by building "exploratory" tunnels, but to make your initial connection, you need to get a peer set from somewhere. The reseed servers, which you can see listed on in the Java I2P router, provide you with those peers. You then connect to them with the I2P router until you find one who you can reach and build exploratory tunnels through. Reseed servers can tell that you bootstrapped from them, but nothing else about your traffic on the I2P network.

I see IP addresses of all other I2P nodes in the router console. Does that mean my IP address is visible by others?

Yes, this is how a fully distributed peer-to-peer network works. Every node participates in routing packets for others, so your IP address must be known to establish connections. While the fact that your computer runs I2P is public, nobody can see your activities in it. You can't say if a user behind this IP address is sharing files, hosting a website, doing research or just running a node to contribute bandwidth to the project.

What I2P Does Not Do

The I2P network does not officially "Exit" traffic. It has outproxies to the Internet run by volunteers, which are centralized services. I2P is primarily a hidden service network and outproxying is not an official function, nor is it advised. The privacy benefits you get from participating in the the I2P network come from remaining in the network and not accessing the internet. I2P recommends that you use Tor Browser or a trusted VPN when you want to browse the Internet privately.


Há muitos outros excelentes aplicativos e projetos trabalhando com comunicação anônima e a I2P tem se inspirado em muitos desses esforços. Esta não é uma lista abrangente de recursos de anonimato - tanto a bibliografia sobre anonimato do Freehaven bem como a relação de projetos correlatos ao GNUnet servem pra esse propósito. Isso dito, alguns sistemas merecem comparações. Os seguintes são comparados em páginas em separado:

Os seguintes são discutidos na página de outras redes:

  • RetroShare
  • Morphmix / Tarzan
  • Mixminion / Mixmaster
  • JAP
  • MUTE / AntsP2P
  • Haystack