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Questions tagged [signal]

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

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Signal desktop app and mobile app not syncing chat histories [closed]

The Signal desktop app on my MacBook Pro (MBP) running macOS Catalina 10.15.7, did not sync chat histories between my MBP and my iPhone xR even when the desktop app was opened within the 60 day time ...
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4 votes
2 answers
174 views

In a synchronous environment, does Signal offer any security benefits that can’t be achieved with a modern version of TLS?

The Signal protocol utilizes the double ratchet algorithm to achieve end-to-end encryption with forward secrecy and future secrecy (aka break-in recovery). Forward secrecy ensures that if any of the ...
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1 answer
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Is it possible to snoop on documents/media while uploading them on a Desktop app?

Websites often enforce HTTPS to prevent snooping of sensitive input. Is there something equivalent while uploading files from local disk onto a desktop app, say the desktop version of Signal? When I ...
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8 votes
1 answer
5k views

Signal messaging app / How does sync on connected devices work?

I would like to know how paired devices get synced together in Signal messaging app. So this is what they say on their website Signal messages, pictures, files, and other contents are stored locally ...
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0 votes
3 answers
309 views

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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1 vote
2 answers
878 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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1 vote
2 answers
266 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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2 answers
384 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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3 votes
0 answers
213 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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5 votes
1 answer
1k 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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40 votes
2 answers
29k 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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1 vote
1 answer
2k 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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0 votes
1 answer
182 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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7 votes
4 answers
1k 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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1 vote
3 answers
1k 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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1 vote
0 answers
90 views

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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2 votes
3 answers
699 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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5 votes
1 answer
365 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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1 vote
1 answer
633 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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11 votes
1 answer
510 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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1 vote
0 answers
178 views

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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3 votes
2 answers
378 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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5 votes
1 answer
652 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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1 vote
1 answer
524 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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18 votes
3 answers
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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5 votes
1 answer
751 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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53 votes
3 answers
30k 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 ...
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