Updated techintro, revamped 'overview' part.

This commit is contained in:
mathiasdm
2010-08-18 08:55:25 +00:00
parent fb2dc40824
commit 0f777510be
4 changed files with 1295 additions and 29 deletions

View File

@@ -0,0 +1,375 @@
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@@ -96,18 +96,13 @@
blogging and content syndication, newsgroups, as well as several other applications under development.
<ul>
<li>Web browsing: using any existing browser that supports using a proxy.</li>
<li>Chat: IRC, Jabber, <a href="#app.i2pmessenger">I2P-messenger</a></li>
<li>File sharing:
<ul>
<li><a href="#app.i2psnark">I2PSnark</a></li>
<li><a href="#app.robert">Robert</a></li>
<li><a href="#app.i2phex">I2Phex</a></li>
<li><a href="#app.pybit">PyBit</a></li>
<li><a href="#app.i2pbt">I2P-bt</a></li>
</ul>
<li>Chat: IRC, Jabber, <a href="#app.i2pmessenger">I2P-messenger</a>.</li>
<li>File sharing: <a href="#app.i2psnark">I2PSnark</a>, <a href="#app.robert">Robert</a>,
<a href="#app.i2phex">I2Phex</a>, <a href="#app.pybit">PyBit</a>, <a href="#app.i2pbt">I2P-bt</a>
and others.
</li>
<li>E-mail: <a href="#app.i2pmail">susimail</a> and <a href="#app.i2pbote">I2P-Bote</a></li>
<li>Using any newsgroup reader that supports using a proxy.</li>
<li>E-mail: <a href="#app.i2pmail">susimail</a> and <a href="#app.i2pbote">I2P-Bote</a>.</li>
<li>Newsgroups: using any newsgroup reader that supports using a proxy.</li>
</ul>
<p>
Unlike web sites hosted within content distribution networks like <a href="#similar.freenet">Freenet</a>
@@ -132,7 +127,8 @@
a series of APIs in various languages which can be used to make the most out
of the network.
</p>
<p> I2P is not a research project - academic, commercial, or governmental, but
<p>
I2P is not a research project - academic, commercial, or governmental, but
is instead an engineering effort aimed at doing whatever is necessary to provide
a sufficient level of anonymity to those who need it. It has been in active
development since early 2003 with one full time developer and a dedicated
@@ -143,14 +139,15 @@
working on I2P do not control what people release client applications under,
and there are several GPL'ed applications available (<a href="#app.i2ptunnel">I2PTunnel</a>,
<a href="#app.i2pmail">susimail</a>, <a href="#app.i2psnark">I2PSnark</a>,
<a href="#app.i2phex">I2Phex</a>).
<a href="#app.i2phex">I2Phex</a> and others.).
<a href="http://www.i2p.net/halloffame">Funding</a> for I2P comes entirely from donations,
and does not receive any tax breaks in any jurisdiction at this time,
as many of the developers are themselves anonymous.
</p>
<h1 id="op">Operation</h1>
<h2 id="op.overview">Overview</h2>
<p> To understand I2P's operation, it is essential to understand a few key concepts.
<p>
To understand I2P's operation, it is essential to understand a few key concepts.
First, I2P makes a strict separation between the software participating in
the network (a "router") and the anonymous endpoints ("destinations") associated
with individual applications. The fact that someone is running I2P is not
@@ -159,21 +156,37 @@
to. End users will typically have several local destinations on their router
- for instance, one proxying in to IRC servers, another supporting the user's
anonymous webserver ("eepsite"), another for an I2Phex instance, another for
torrents, etc. </p>
<p> Another critical concept to understand is the "tunnel" - a directed path
through an explicitly selected set of routers, making use of layered encryption
so that the messages sent in the tunnel's "gateway" appear entirely random
at each hop along the path until it reaches the tunnel's "endpoint". These
unidirectional tunnels can be seen as either "inbound" tunnels or "outbound"
tunnels, referring to whether they are bringing messages to the tunnel's creator
or away from them, respectively. The gateway of an inbound tunnel can receive
messages from any peer and will forward them down through the tunnel until
it reaches the (anonymous) endpoint (the creator). On the other hand, the
gateway of an outbound tunnel is the tunnel's creator, and messages sent through
that tunnel are encoded so that when they reach the outbound tunnel's endpoint,
that router has the instructions necessary to forward the message on to the
appropriate location. </p>
<p> A third critical concept to understand is I2P's "network database" (or "netDb")
torrents, etc.
</p>
<p>
Another critical concept to understand is the "tunnel".
A tunnel is a directed path through an explicitly selected list of routers.
Layered encryption is used, so each of the routers can only decrypt a single layer.
The decrypted information contains the IP of the next router, along with
the encrypted information to be forwarded.
Each tunnel has a starting point (the first router, also known as "gateway")
and an end point. Messages can be sent only in one way. To send messages back,
another tunnel is required.
</p>
<center><div class="box"><img src="_static/images/tunnels.png" alt="Inbound and outbound tunnel schematic" title="Inbound and outbound tunnel schematic" /></div></center><br/>
<p>
Two types of tunnels exist:
<b>"outbound" tunnels</b> send messages away from the tunnel creator,
while <b>"inbound" tunnels</b> bring messages to the tunnel creator.
Combining these two tunnels allows users to send messages to each other.
The sender ("Alice" in the above image) sets up an outbound tunnel,
while the receiver ("Bob" in the above image) creates an inbound tunnel.
The gateway of an inbound tunnel can receive messages from any other user
and will send them on until the endpoint ("Bob").
The endpoint of the outbound tunnel will need to send the message
on to the gateway of the inbound tunnel.
To do this, the sender ("Alice") adds instructions to her encrypted message.
Once the endpoint of the outbound tunnel decrypts the message,
it will have instructions to forward the message to the correct
inbound gateway (the gateway to "Bob").
</p>
<p>
A third critical concept to understand is I2P's "network database" (or "netDb")
- a pair of algorithms used to share network metadata. The two types of metadata
carried are "routerInfo" and "leaseSets" - the routerInfo gives routers the
data necessary for contacting a particular router (their public keys, transport

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