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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.
Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption. The stated goal of the project is to provide secure yet easily accessible communication for everyone. [2] A reference implementation of the protocol is published as free and open-source software under the terms of the GNU GPL-3.0-or-later.
Wire offers end-to-end encrypted messaging, file-sharing, video and voice calls, and guest rooms for external communication. [15]The app allows group calling with up to twenty-five participants and video conferences support up to 12 people.
Other messengers such as Telegram, Session, Briar and Threema all offer end-to-end encrypted messaging. Facebook's Messenger app is also end-to-end encrypted, a feature that became default last year.
For everyday consumers, the simplest way to send encrypted messages or make encrypted calls is to use communications apps like Signal or WhatsApp that have implemented end-to-end encryption ...
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] [159] [156] [160] Up until March 2017, Signal's voice calls were encrypted with SRTP and the ZRTP key-agreement protocol, which was developed by Phil Zimmermann.
Wire provides end-to-end encryption for its instant messages. Wire's instant messages are encrypted with Proteus, a protocol that Wire Swiss developed based on the Signal Protocol . [ 35 ] [ 36 ] Wire's voice calls are encrypted with DTLS and SRTP , [ 18 ] [ 35 ] and its video calls with RTP . [ 1 ]
Skype's encryption is inherent in the Skype Protocol and is transparent to callers. Some private conversations through Skype such as audio calls, text messages, and file sending (image, audio, or video) can make use of end-to-end encryption, but it may have to be manually turned on. [4]