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Off-the-record Messaging (OTR) is a cryptographic protocol that provides encryption for instant messaging conversations. OTR uses a combination of AES symmetric-key algorithm with 128 bits key length, the Diffie–Hellman key exchange with 1536 bits group size, and the SHA-1 hash function.
In September 2015, G Data Software launched a new messaging app called Secure Chat which used the Signal Protocol. [34] [35] G Data discontinued the service in May 2018. [36] In September 2016, Google launched a new messaging app called Allo, which featured an optional "incognito mode" that used the Signal Protocol for end-to-end encryption.
Cryptocat is a discontinued open-source desktop application intended to allow encrypted online chatting available for Windows, OS X, and Linux. [3] It uses end-to-end encryption to secure all communications to other Cryptocat users. Users are given the option of independently verifying their buddies' device lists and are notified when a buddy's ...
The term "end-to-end encryption" originally only meant that the communication is never decrypted during its transport from the sender to the receiver. [9] For example, around 2003, E2EE has been proposed as an additional layer of encryption for GSM [10] or TETRA, [11] in addition to the existing radio encryption protecting the communication between the mobile device and the network infrastructure.
In Google Allo, Skype and Facebook Messenger, conversations are not encrypted with the Signal Protocol by default; they only offer end-to-end encryption in an optional mode. [132] [158] [155] [159] Up until March 2017, Signal's voice calls were encrypted with SRTP and the ZRTP key-agreement protocol, which was developed by Phil Zimmermann.
Wickr is an American software company based in New York City. [1] It is known for its instant messaging application of the same name. The Wickr instant messaging apps allow users to exchange end-to-end encrypted and content-expiring messages, and are designed for iOS, Android, Mac, Windows, and Linux operating systems.
The EncroChat service was available for handsets called "carbon units", [21] whose GPS, camera and microphone functions were disabled by the company for privacy reasons. [1] [14] Devices were sold with pre-installed applications, including EncroChat, an OTR-based messaging app which routed conversations through a central server based in France, EncroTalk, a ZRTP-based voice call service, and ...
End-to-end encryption Unlimited number of contacts Bulletins to all contacts One-to-many routing [a] Spam protection Group, channel or conference support Audio/VoIP support Webcam/Video Batch file sharing Media synchronization Serverless [b] (decentralized) Binary format Protocol