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and video messages over a Wi-Fi or data connection to other Signal users on i OS, Android and a desktop app. All communications to other Signal users are automatically end-to-end encrypted.

The keys that are used to encrypt the user's communications are generated and stored at the endpoints (i.e. On Android, users can opt into making Signal the default SMS/MMS application, allowing them to send and receive unencrypted SMS messages in addition to the standard end-to-end encrypted Signal messages.

Since Cyanogen Mod 11.0, the client logic was contained in a system app called Whisper Push.

According to Open Whisper Systems, the Cyanogen team ran their own Signal messaging server for Whisper Push clients, which federated with Open Whisper Systems' Signal server, so that both clients could exchange messages with each other.

Some criticized the removal, arguing that the software was "specifically targeted [to help] people under repressive regimes" and that it left people like the Egyptians in "a dangerous position" during the events of the 2011 Egyptian revolution. a) Addition of encrypted group chat and instant messaging capabilities to Text Secure.

b) End of encrypted SMS/MMS messaging in Text Secure, which prompted the creation of a fork.

Signal is the successor of an encrypted voice calling app called Red Phone and an encrypted texting program called Text Secure.

The applications include mechanisms by which users can independently verify the identity of their messaging correspondents and the integrity of the data channel.

Signal relies on centralized servers that are maintained by Open Whisper Systems.

In addition to routing Signal's messages, the servers also facilitate the discovery of contacts who are also registered Signal users and the automatic exchange of users' public keys.

The developers have stressed that this is meant to be "a collaborative feature for conversations where all participants want to automate minimalist data hygiene, not for situations where your contact is your adversary".

The study concluded that 21 out of 28 participants failed to correctly compare public key fingerprints in order to verify the identity of other Signal users, and that the majority of these users still believed they had succeeded while in reality they failed.

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