When two people are using Signal for a call, two words are displayed on each of their screens. Verify the SAS at the start of every call!”Īfter placing a call, users have long been advised to read the Short Authentication String (SAS) to each other in order to ensure there is no man-in-the-middle attack occurring. Edward SnowdenĪlthough Snowden loves Signal, a user on the subreddit NetSec posted the following public service announcement: “Signal for Android (replaced RedPhone+TextSecure yesterday) currently comments out ZRTP key continuity code. It’s really nice.”Įven Edward Snowden endorsed Signal, claiming to use it daily.

It's my first choice for an encrypted conversation.”Ĭryptographer Matt Green also delivered high praise, saying, “After reading the code, I literally discovered a line of drool running down my face. Security expert Bruce Schneier is quoted as saying, “I am regularly impressed with the thought and care put into both the security and the usability of this app. Everything in Signal is always end-to-end encrypted, and painstakingly engineered in order to keep your communication safe. We cannot hear your conversations or see your messages, and no one else can either. There are no separate logins, usernames, passwords, or PINs to manage or lose.

“Privacy is possible, Signal makes it easy,” wrote Marlinspike.Īs always, Signal uses your existing phone number and address book. Everything is always end-to-end encrypted and painstakingly engineered in order to keep your communication safe.”

Open Whisper Systems explained, “We cannot read your messages, and no one else can either. The private messaging side of Signal allows users to send messages, pictures, and videos messages to groups as well as individuals. Yet installing Signal is not a complicated process for people of any age, and using it is “just as straightforward as normal calling and texting.” Wired called the combination of RedPhone and TextSecure into one app “a milestone” in “privacy programs’ idiot-proof interface.”

Textsecure