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Logo of OMEMO. OMEMO is an extension to the Extensible Messaging and Presence Protocol for multi-client end-to-end encryption developed by Andreas Straub.According to Straub, OMEMO uses the Double Ratchet Algorithm "to provide multi-end to multi-end encryption, allowing messages to be synchronized securely across multiple clients, even if some of them are offline". [1]
End-to-end encryption is regarded as safer [20] because it reduces the number of parties who might be able to interfere or break the encryption. [21] In the case of instant messaging, users may use a third-party client or plugin to implement an end-to-end encryption scheme over an otherwise non-E2EE protocol. [22]
A mechanical ratchet. The Double Ratchet Algorithm features properties that have been commonly available in end-to-end encryption systems for a long time: encryption of contents on the entire way of transport as well as authentication of the remote peer and protection against manipulation of messages.
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" [3] or Google who provides end-to-end encryption by default to all RCS-based conversations between users of their Google Messages app for one-to-one conversations. [4]
Modern encryption standards often use stronger key sizes, such as AES (256-bit mode), TwoFish, ChaCha20-Poly1305, Serpent (configurable up to 512-bit). Cipher suites that use a 128-bit or higher key, like AES, will not be able to be brute-forced because the total amount of keys is 3.4028237e+38 possibilities.
Messaging Layer Security (MLS) is a security layer for end-to-end encrypting messages. It is maintained by the MLS working group of the Internet Engineering Task Force, and is designed to provide an efficient and practical security mechanism for groups as large as 50,000 and for those who access chat systems from multiple devices.
ChaCha20-Poly1305 is an authenticated encryption with associated data (AEAD) algorithm, that combines the ChaCha20 stream cipher with the Poly1305 message authentication code. [1] It has fast software performance, and without hardware acceleration, is usually faster than AES-GCM .
In cryptography, Post-Quantum Extended Diffie–Hellman (PQXDH) is a Kyber-based post-quantum cryptography upgrade to the Diffie–Hellman key exchange.It is notably being incorporated into the Signal Protocol, an end-to-end encryption protocol.