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E-mail freenet

e-mail freenet

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Through the use of separate applications or plugins loaded into the node software, users can interact with the network in other ways, such as forums similar to web forums or Usenet or interfaces more similar to traditional P2P "filesharing" interfaces.

While Freenet provides an HTTP interface for browsing freesites, it is not a proxy for the World Wide Web ; Freenet can be used to access only the content that has been previously inserted into the Freenet network.

Because of that, Freenet acts differently at certain points that are directly or indirectly related to the anonymity part. Freenet attempts to protect the anonymity of both people inserting data into the network uploading and those retrieving data from the network downloading.

Unlike file sharing systems, there is no need for the uploader to remain on the network after uploading a file or group of files. Instead, during the upload process, the files are broken into chunks and stored on a variety of other computers on the network.

When downloading, those chunks are found and reassembled. Every node on the Freenet network contributes storage space to hold files and bandwidth that it uses to route requests from its peers.

As a direct result of the anonymity requirements, the node requesting content does not normally connect directly to the node that has it; instead, the request is routed across several intermediaries, none of which know which node made the request or which one had it.

As a result, the total bandwidth required by the network to transfer a file is higher than in other systems, which can result in slower transfers, especially for infrequently accessed content.

With Opennet, users connect to arbitrary other users. With Darknet, users connect only to "friends" with whom they previously exchanged public keys , named node-references.

Both modes can be used together. Freenet attempts to remove the possibility of any group imposing its beliefs or values on any data. Although many states censor communications to different extents, they all share one commonality in that a body must decide what information to censor and what information to allow.

What may be acceptable to one group of people may be considered offensive or even dangerous to another.

In essence, the purpose of Freenet is to ensure that no one is allowed to decide what is acceptable. It was reported that in Freenet China had several thousand dedicated users.

The Freenet file sharing network stores documents and allows them to be retrieved later by an associated key, as is now possible with protocols such as HTTP.

The network is designed to be highly survivable. The system has no central servers and is not subject to the control of any one individual or organization, including the designers of Freenet.

Information stored on Freenet is distributed around the network and stored on several different nodes. Encryption of data and relaying of requests makes it difficult to determine who inserted content into Freenet, who requested that content, or where the content was stored.

This protects the anonymity of participants, and also makes it very difficult to censor specific content. Content is stored encrypted, making it difficult for even the operator of a node to determine what is stored on that node.

This provides plausible deniability , and in combination with the request relaying means that safe harbor laws that protect service providers may also protect Freenet node operators.

When asked about the topic, Freenet developers defer to the EFF discussion which says that not being able to filter anything is a safe choice.

Unlike other P2P networks , Freenet not only transmits data between nodes but actually stores them, working as a huge distributed cache. To achieve this, each node allocates some amount of disk space to store data; this is configurable by the node operator, but is typically several GB or more.

Files on Freenet are typically split into multiple small blocks, with duplicate blocks created to provide redundancy.

Each block is handled independently, meaning that a single file may have parts stored on many different nodes. Two advantages of this design are high reliability and anonymity.

Information remains available even if the publisher node goes offline, and is anonymously spread over many hosting nodes as encrypted blocks, not entire files.

The key disadvantage of the storage method is that no one node is responsible for any chunk of data. If a piece of data is not retrieved for some time and a node keeps getting new data, it will drop the old data sometime when its allocated disk space is fully used.

While users can insert data into the network, there is no way to delete data. Typically, a host computer on the network runs the software that acts as a node, and it connects to other hosts running that same software to form a large distributed, variable-size network of peer nodes.

Some nodes are end user nodes, from which documents are requested and presented to human users. Other nodes serve only to route data.

All nodes communicate with each other identically — there are no dedicated "clients" or "servers". It is not possible for a node to rate another node except by its capacity to insert and fetch data associated with a key.

This is unlike most other P2P networks where node administrators can employ a ratio system, where users have to share a certain amount of content before they can download.

Freenet may also be considered a small world network. The Freenet protocol is intended to be used on a network of complex topology, such as the Internet Internet Protocol.

Each node knows only about some number of other nodes that it can reach directly its conceptual "neighbors" , but any node can be a neighbor to any other; no hierarchy or other structure is intended.

Each message is routed through the network by passing from neighbor to neighbor until it reaches its destination.

As each node passes a message to a neighbor, it does not know whether the neighbor will forward the message to another node, or is the final destination or original source of the message.

This is intended to protect the anonymity of users and publishers. Each node maintains a data store containing documents associated with keys, and a routing table associating nodes with records of their performance in retrieving different keys.

The Freenet protocol uses a key-based routing protocol, similar to distributed hash tables. The routing algorithm changed significantly in version 0.

Prior to version 0. In either case, new connections were sometimes added to downstream nodes i. The disadvantage of this is that it is very easy for an attacker to find Freenet nodes, and connect to them, because every node is continually attempting to find new connections.

Darknet is less convenient, but much more secure against a distant attacker. This change required major changes in the routing algorithm.

Every node has a location, which is a number between 0 and 1. When a key is requested, first the node checks the local data store. This goes on until some number of hops is exceeded, there are no more nodes to search, or the data is found.

If the data is found, it is cached on each node along the path. So there is no one source node for a key, and attempting to find where it is currently stored will result in it being cached more widely.

Essentially the same process is used to insert a document into the network: If older data is found, the older data is propagated and returned to the originator, and the insert "collides".

But this works only if the locations are clustered in the right way. Freenet assumes that the Darknet a subset of the global social network is a small-world network, and nodes constantly attempt to swap locations using the Metropolis—Hastings algorithm in order to minimize their distance to their neighbors.

However, it does not guarantee that data will be found at all. Eventually, either the document is found or the hop limit is exceeded.

The intermediate nodes may choose to cache the document along the way. Besides saving bandwidth, this also makes documents harder to censor as there is no one "source node.

Initially, the locations in Darknet are distributed randomly. This means that routing of requests is essentially random. In Opennet connections are established by a join request which provides an optimized network structure if the existing network is already optimized.

As location swapping on Darknet and path folding on Opennet progress, nodes which are close to one another will increasingly have close locations, and nodes which are far away will have distant locations.

Data with similar keys will be stored on the same node. The result is that the network will self-organize into a distributed, clustered structure where nodes tend to hold data items that are close together in key space.

There will probably be multiple such clusters throughout the network, any given document being replicated numerous times, depending on how much it is used.

This is a kind of " spontaneous symmetry breaking ", in which an initially symmetric state all nodes being the same, with random initial keys for each other leads to a highly asymmetric situation, with nodes coming to specialize in data that has closely related keys.

There are forces which tend to cause clustering shared closeness data spreads throughout the network , and forces that tend to break up clusters local caching of commonly used data.

These forces will be different depending on how often data is used, so that seldom-used data will tend to be on just a few nodes which specialize in providing that data, and frequently used items will be spread widely throughout the network.

Therefore, there will be no correlation between key closeness and similar popularity of data as there might be if keys did exhibit some semantic meaning, thus avoiding bottlenecks caused by popular subjects.

A CHK is a SHA hash of a document after encryption, which itself depends on the hash of the plaintext and thus a node can check that the document returned is correct by hashing it and checking the digest against the key.

This key contains the meat of the data on Freenet. It carries all the binary data building blocks for the content to be delivered to the client for reassembly and decryption.

The CHK is unique by nature and provides tamperproof content. A hostile node altering the data under a CHK will immediately be detected by the next node or the client.

CHKs also reduce the redundancy of data since the same data will have the same CHK and when multiple sites reference the same large files, they can reference to the same CHK.

SSKs are based on public-key cryptography. Currently Freenet uses the DSA algorithm. Documents inserted under SSKs are signed by the inserter, and this signature can be verified by every node to ensure that the data is not tampered with.

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