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مشاهدة ملف: README.md

libsignal-node
========
Signal protocol implementation for Node.js based on
[libsignal-protocol-javascript](https://github.com/WhisperSystems/libsignal-protocol-javascript).

[![npm](https://img.shields.io/npm/v/libsignal.svg)](https://www.npmjs.com/package/libsignal)
[![npm](https://img.shields.io/npm/l/libsignal.svg)](https://github.com/ForstaLabs/libsignal-node)

Overview
--------
A ratcheting forward secrecy protocol that works in synchronous and
asynchronous messaging environments.

PreKeys
--------
This protocol uses a concept called 'PreKeys'. A PreKey is an ECPublicKey and
an associated unique ID which are stored together by a server. PreKeys can also
be signed.

At install time, clients generate a single signed PreKey, as well as a large
list of unsigned PreKeys, and transmit all of them to the server.

Sessions
--------
Signal Protocol is session-oriented. Clients establish a "session," which is
then used for all subsequent encrypt/decrypt operations. There is no need to
ever tear down a session once one has been established.

Sessions are established in one of two ways:

1. PreKeyBundles. A client that wishes to send a message to a recipient can
establish a session by retrieving a PreKeyBundle for that recipient from the
server.
2. PreKeySignalMessages. A client can receive a PreKeySignalMessage from a
recipient and use it to establish a session.

State
--------
An established session encapsulates a lot of state between two clients. That
state is maintained in durable records which need to be kept for the life of
the session.

State is kept in the following places:

* Identity State. Clients will need to maintain the state of their own identity
key pair, as well as identity keys received from other clients.
* PreKey State. Clients will need to maintain the state of their generated
PreKeys.
* Signed PreKey States. Clients will need to maintain the state of their signed
PreKeys.
* Session State. Clients will need to maintain the state of the sessions they
have established.

License
--------
Licensed under the GPLv3: http://www.gnu.org/licenses/gpl-3.0.html