While all secure messenger services apply encryption to your messages, most don't do the same for your message metadata. It uses Curve25519, AES-256, and HMAC-SHA256 for its encryption algorithms. If you want the technical side of things, the protocol is built on the Double Ratchet algorithm, triple Elliptic-curve Diffie–Hellman (3-DH) handshake, and prekeys. This open source code has been heavily audited and is so good that it is used for E2E encrypted messages by WhatsApp, Skype, and Facebook Messenger. Many in the security community consider Signal to be the most secure end-to-end (E2E) encryption system available for voice, video, and instant messaging conversations.
The LLC is funded by the Signal Technology Foundation (aka Signal Foundation), a 501(c)(3) non-profit organization that publishes all its products as free and open-source software (FOSS). This company now has responsibility for developing the Signal app and the Signal Protocol that provides its security. Marlinspike and Brian Acton founded Signal Messenger, LLC in 2018. In 2013, Matthew Rosenfeld (commonly known as Moxie Marlinspike) founded Open Whisper Systems to develop the Signal app and protocol.
Signal is a product of Signal Messenger, LLC. Signal Messenger is available for the iOS, Android, Mac, Windows, and Linux operating systems. If you are looking for a secure messaging app with things like the leading secure messaging protocol (the Signal protocol), client-side end-to-end (E2E) encryption, data synced across multiple devices, and a very low price (free), then you should keep reading and learn more about Signal. However, there are other options for these types of users, as we noted in our Wickr Review. There are no special business or educational versions so if you need corporate features like centralized user control, Signal isn't for you. Signal offers a full range of features for personal secure messaging. If you want some additional proof that Signal is worth your attention, consider this: during the great 2021 exodus of users from WhatsApp, Telegram and Signal were the two apps that people were most likely to switch to. By the time we're done, I think you will agree with me that this app should be on your secure messaging app short list. In this Signal review, we will examine the security and features of Signal. It relies on the internet for all its encrypted communication and is regarded as the best when it comes to privacy and security. A free and open source application ( FOSS), Signal uses end-to-end encryption to securely communicate with other Signal users. Signal Messenger is perhaps the most secure messaging app available.
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