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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.
It does not provide anonymity preservation and requires servers for the relaying of messages and storing of public key material. [18] The Signal Protocol also supports end-to-end encrypted group chats. The group chat protocol is a combination of a pairwise double ratchet and multicast encryption. [18]
The default values of the encryption key and salt key are the same as for AES in counter mode. (AES running in this mode has been chosen to be used in 3G mobile networks.) Besides the AES cipher, SRTP allows the ability to disable encryption outright, using the so-called null encryption cipher, which can be assumed as an alternate supported cipher.
Secure instant messaging – Some instant messaging clients use end-to-end encryption with forward secrecy to secure all instant messages to other users of the same software. Some instant messaging clients also offer end-to-end encrypted file transfer support and group messaging. VoIP – Some VoIP clients implement ZRTP and SRTP encryption for ...
The DTLS protocol datagram preserves the semantics of the underlying transport—the application does not suffer from the delays associated with stream protocols, but because it uses User Datagram Protocol (UDP) or Stream Control Transmission Protocol (SCTP), the application has to deal with packet reordering, loss of datagram and data larger ...
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On secondary desktop devices only (phone required to sync messages) [179] No WhatsApp: On secondary desktop devices only (phone required to sync messages; 4 linked devices) Phone must not be offline for ≥ 14 days; message history limited to 3 months. Unsupported on iPad, iPod Touch. [180] Yes Yes Yes No No Wire: Yes [181] No No No Client
Discord allows for casual text, audio and video chat in invite-only communities, called servers (some servers are set to provide open invitations to anyone who wants to join).