Questions tagged [signal]

A protocol (as well as an app implementing it) for end-to-end encrypted instant messaging.

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What can my Telco / ISP learn from my Signal (secure messaging app) communications?

To preface this question, I use Signal messaging app for voice, video and text. I understand that the content of all these messages are encrypted and no-one but the sender and recipient can see/hear ...
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1answer
132 views

Telegram, Signal, WhatsApp: chats encrypted in local storage on mobile devices?

I wonder if the chat content's are encrypted in local storage on mobile devices (iOS, Android). I hardly found any reliable information about this topic. My thought is about somebody stealing my ...
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180 views

Known flaws in Signal app's security

Are there any known exploits in Signal's encryption protocol that could lead to messages being decrypted, or any other compromising information being released?
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2answers
125 views

Is the video/audio traffic from WebRTC TURN relay servers encrypted end-to-end? As with the applications Signal and Jitsi Meet

Today I found a video on YouTube that surprised me (https://www.youtube.com/watch?v=Pkc3sE6iKV4). It is by Rob Braxman, a privacy advocate with a lot of expertise. He talks about all kinds of video ...
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160 views

What secure mobile messaging app is publicly known to be the most frustrating for state intelligence to read? [closed]

I imagine like either leaked or otherwise published official memos on efforts and signals intelligence programs to intercept and crack different types of communications either lamenting or chronicling ...
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1answer
541 views

Can WhatsApp, Signal or Telegram be hacked through a SIM SWAP attack?

In Cuba the telecoms/ISP monopoly, Etecsa, works with the political police to spy on dissidents, journalists and others. A common attack in Cuba is therefore SIM Swapping which is easy for them. It is ...
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1answer
22k views

Why is there no web client for Signal?

I’ve read about E2EE (end to end encryption) of Signal in web clients on a Signal Community discussion forum, and wonder why they say that the browser is insecure for E2EE and native apps are secure. ...
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1answer
883 views

In Signal Messenger what is the purpose of verifying a safety number?

I've read the official page on safety numbers but they are still unclear to me. Without verification, there still is end to end encryption, so what difference does it make? Is it that a phone number ...
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1answer
112 views

If Signal database leaks, can somebody bruteforce access into my contact's chat history?

Recently Signal started forcing users to create a pin. I'm curious about the feature - doesn't it make Signal less secure if their database gets compromised? In other words, suppose that I'm chatting ...
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4answers
788 views

Why do people use “burner phones” rather than Signal or similar solutions?

Why do people use burner phones rather than Signal or similar? I would imagine that if you are high value target the police or intelligence service would simply eavesdrop every phone call passing the ...
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28 views

What kind of protection does an electron sandbox provide?

How does an electron sandbox work? What kind of protections does it provide? Signal for example now runs by default with --no-sandbox. Should I be taking extra precautions when running signal?
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673 views

Signal: contact people, or have people contact me, without revealing phone number?

Is it possible to use Signal without revealing my phone number to others? I'm personally using the Signal app on Android, but of course it applies to all versions, desktop and mobile. With Telegram ...
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Meaning of unacknowledged pre key messages

I've recently tried to work with the Signal protocol, but the documentation isn't great. I've come across a problem where the messages being sent include the pre key because the client has ...
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2answers
384 views

Are Whatsapp and Signal truly secure and user-privacy friendly?

I have been learning the famous "SIGNAL MESSAGING PROTOCOL", Its brilliantly designed and perfectly secure , but I doubt on its implementations Famous messenger services like Whatsapp and Signal ...
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1answer
310 views

How can WhatsApp be listed on the EFF secure application toolset when it's not opensource? [closed]

I see this EFF tool guide, proposing WhatsApp as one of "our pick of the best, most secure applications" source. How can WhatsApp be trusted as a secure application when it is not open-source (...
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1answer
400 views

How to use Username/Password in Signal Protocol

I am trying to create a communication app from scratch (more like an html parsed messaging app) using the Signal protocol. While I do have lot to of programming experience, I am a crypto novice and ...
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1answer
447 views

Private messaging for protesters

Hello I am a protester in Hong Kong. Many protesters use telegram group. I have heard recently from the News that a group admin was tricked by the police to unlock their phone (police cannot force ...
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HTTP body E2E encryption protocol

I have 2 servers that communicate each other in HTTP and they are both behind an API gateway. Between the servers and their API gateways the communication is in HTTPS with mutual authentication using ...
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2answers
320 views

Can a data requester get the sender when “Sealed sender” is enabled in Signal?

The Signal app offers to seal the sender. The whole process can be summarized in the following steps: The app encrypts the message using Signal Protocol, as usual. Include the sender certificate and ...
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1answer
541 views

How was IronChat compromised?

How was IronChat compromised? https://hotforsecurity.bitdefender.com/blog/police-crack-encrypted-chat-service-ironchat-and-read-258000-messages-from-suspected-criminals-20530.html Dutch police have ...
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1answer
269 views

Signal Protocol: How is identity exchanged if a key exchange hasn't happened yet?

On Signal's blog they mention that keys for accessing your profile are exchanged normally with your contacts using the Signal Protocol just like messages are (implying they are already contacts and ...
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3answers
4k views

Why iterate 5200 times when computing Safety Numbers in Signal?

Safety numbers in Signal are derived from a hash of the conversation's users public keys and their phone numbers. Safety number are used to ensure that the conversation was not MITM-ed. When ...
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1answer
560 views

Can Signal encrypted voice calls be listened into by other apps?

Signal App (by Open Whisper) provides encrypted voice calls allowing two people to communicate via a data connection with secure encryption (assuming no MiTM attack). Given that Signal App uses the ...
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2answers
28k views

Is Signal still more secure than WhatsApp?

WhatsApp has "recently" deployed end-to-end encryption using the Signal protocol, which is of course also being used by Signal itself. The related white paper (PDF). Now this raises the question: Is ...