My friend and I were discussing cell phone security and he said that if someone backdoored your phone that they could read all your signal messages. Is this true? I would think that the only way to view signal messages is to literally open up the app and view them.
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If your phone is compromised, anything that you can see they can see as well. Absolutely nothing can protect against that because the only way would be to prevent even yourself from seeing it.
Potentially a really good sandbox and strict permissions could help, but if someone were to backdoor your phone chances are they can get around most software based solutions anyway.
Try molly – hardened fork of signal. With encrypted keys as soon as you lock it after using the app it shreds itself from ram.
If a device is compromised, the adversary can do whatever they want: screenshots, keyloggers, fork Signal and install their own client.
You can use Molly a fork of signal
If the phone is backdoored, it would change nothing.
😂 u r just a h8r
The messages are encrypted on the phone
But you can view the messages on your phone, so they are decrypted at some point. Then an attacker can steal the key and read them whenever they want. Or they just take screenshots when you use the app if they are lazy.
Molly has a feature, which prevents screenshots. Also everywhere you are in danger of password stealing, bruteforce attacks, etc.
Again, if you can see it on the screen it’s possible to steal it. (How easy it is depends on the driver)
Molly (or any app) won’t help you if your phone is compromised, unless you set a pin to lock your messages and never unlock it after being compromised. (which is unlikely)
They only try to promote their app.
You are both sort of right. Signal’s on device storage is AFAIK only weakly encrypted with your screen-lock password (although you can enable a second weak password in Signal specifically). So if your phone is unlocked and backdoored the attacker can pretty much do what ever they want including reading your Signal messages.
Edit: to make it more clear… someone with a backdoor can just start a hidden application that does the same as the Signal client and open the on device stored messages with out your knowledge. And it is also quite trivial to install a keylogger to capture all passwords including those inside Signal.