Īs of October 2016, the Signal Protocol is based on TextSecure v3, but with additional cryptographic changes.
Ejabberd secure cipher full#
They also renamed the Axolotl Ratchet as the Double Ratchet algorithm to better differentiate between the ratchet and the full protocol because some had used the name Axolotl when referring to the full protocol. In March 2016, the developers renamed the protocol as the Signal Protocol.
Among other findings, they presented an unknown key-share attack on the protocol, but in general, they found that it was secure. In October 2014, researchers from Ruhr University Bochum published an analysis of TextSecure v3. The third version of the protocol, TextSecure v3, made some changes to the cryptographic primitives and the wire protocol. The developers refer to the algorithm as self-healing because it automatically disables an attacker from accessing the cleartext of later messages after having compromised a session key. The Axolotl Ratchet was named after the critically endangered aquatic salamander Axolotl, which has extraordinary self-healing capabilities. It brought about support for asynchronous communication ("offline messages") as its major new feature, as well as better resilience with distorted order of messages and simpler support for conversations with multiple participants. The design of the Axolotl Ratchet is based on the ephemeral key exchange that was introduced by OTR and combines it with a symmetric-key ratchet modeled after the Silent Circle Instant Messaging Protocol (SCIMP). On 24 February 2014, Open Whisper Systems introduced TextSecure v2, which migrated to the Axolotl Ratchet. The first version of the protocol, TextSecure v1, was based on Off-the-Record Messaging (OTR).
The Signal Protocol's development was started by Trevor Perrin and Moxie Marlinspike (Open Whisper Systems) in 2013. The protocol combines the Double Ratchet algorithm, prekeys, and a triple Elliptic-curve Diffie–Hellman (3-DH) handshake, and uses Curve25519, AES-256, and HMAC-SHA256 as primitives. Facebook Messenger also say they offer the protocol for optional Secret Conversations, as does Skype for its Private Conversations. Several closed-source applications have implemented the protocol, such as WhatsApp, which is said to encrypt the conversations of "more than a billion people worldwide" or Google who provides end-to-end encryption by default to all RCS-based conversations between users of their Messages app for one-to-one conversations. The protocol was developed by Open Whisper Systems in 2013 and was first introduced in the open-source TextSecure app, which later became Signal.
The Signal Protocol (formerly known as the TextSecure Protocol) is a non- federated cryptographic protocol that can be used to provide end-to-end encryption for voice calls and instant messaging conversations. Non-federated cryptographic protocol Signal Protocol Communication protocol
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