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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.
Yahoo! Messenger (sometimes abbreviated Y!M) was an instant messaging client and associated protocol created and formerly operated by Yahoo!.Yahoo! Messenger was provided free of charge and could be downloaded and used with a generic "Yahoo ID", which also allowed access to other Yahoo! services, such as Yahoo!
MSNP (Windows Live Messenger, etc.) MTProto Telegram Messenger LLP 2013 Aug Open standard: Phone number (e.g. +15550123), nickname (e.g. @example) Yes Yes No end-to-end encryption for group chats Yes No Yes Yes, contact blocking Yes Yes [13] Yes Yes Yes No ? MTProto Mumble: Thorvald Natvig 1999 Jul Open standard: Username Yes Yes No
This implies that the sender and receiver of a message must agree on the same key before initiating communications, as is the case with symmetric encryption. For the same reason, MACs do not provide the property of non-repudiation offered by signatures specifically in the case of a network-wide shared secret key: any user who can verify a MAC ...
Examples of such messaging services include: Skype, Facebook Messenger, Google Hangouts (subsequently Google Chat), Telegram, ICQ, Element, Slack, Discord, etc. Users have more options as usernames or email addresses can be used as user identifiers, besides phone numbers. Unlike the phone-based model, user accounts on a multi-device model are ...
Comparison of user features of messaging platforms refers to a comparison of all the various user features of various electronic instant messaging platforms. This includes a wide variety of resources; it includes standalone apps, platforms within websites, computer software, and various internal functions available on specific devices, such as iMessage for iPhones.
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.
The Signal Protocol (formerly known as the TextSecure Protocol) is a non-federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. [2] The protocol was developed by Open Whisper Systems in 2013 [ 2 ] and was introduced in the open-source TextSecure app, which later became Signal .