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About backdoors in crypto messengers

blogs.fsfe.org

11–20 of 71 posts

Re: About backdoors in crypto messengers

#11

It seems that if you really want proper secure channel you need to write one yourself. Anything out there is subject to being compromised. Is there open source alternative for Signal?

also on F-Droid you can find "Silence" which is a fork of "Signal" but only for SMS texts.

Re: About backdoors in crypto messengers

#12
post #8

The backdoor referred to can be applied to any Android app that uses Google Maps. Also mentioned is that using the built-in Google keyboard is a vulnerability, because in theory it gives Google the ability to keylog you. I supposed this boils down to knowing your adversaries. If you number Google amongst that list, life is going to be really difficult - no matter who you are.

Yes, any app that uses Google Maps is backdoored, but a secure messaging app needs to be held to a higher security standard than any old app that uses Google Maps.

It is still possible to run a phone with Signal without any proprietary google code on your phone (see: microG).

Re: About backdoors in crypto messengers

#13

>tl;dr: There is a “backdoor” in Signal nobody cares about, only Google can use it. Speak for yourself. This backdoor is the reason why I don't use Signal.

You don't use Signal because your phone manufacturer can put a backdoor in the OS or hardware?

Why even use a phone?

Re: About backdoors in crypto messengers

#14
post #4

If you're considering Google an adversary, perhaps you shouldn't use stock Android, or any of their software. If you're considering Google an adversary, and use a version of Android without Google support, you can't use Signal anyway.

Actually, it is possible to use Signal on Android without Google using the opensource microG and Xposed framework (setup is a bit involved...but you can google that :P for a guide).

This still relies on Google's servers to support push messages FYI.

Re: About backdoors in crypto messengers

#15
post #13

>tl;dr: There is a “backdoor” in Signal nobody cares about, only Google can use it. Speak for yourself. This backdoor is the reason why I don't use Signal.

You don't use Signal because your phone manufacturer can put a backdoor in the OS or hardware? Why even use a phone?

I don't use Signal because of Google Play Services, which is the backdoor this article refers to.

I'm reasonably confident that my phone's OS is uncompromised and I take the radio problem into consideration as part of my threat model and change my behaviors on my phone accordingly. I have also made some progress on using OsmocomBB as a radio baseband, and on building a custom phone that treats the radio as hostile and isolates it as much as possible.

Re: About backdoors in crypto messengers

#16
post #8

The backdoor referred to can be applied to any Android app that uses Google Maps. Also mentioned is that using the built-in Google keyboard is a vulnerability, because in theory it gives Google the ability to keylog you. I supposed this boils down to knowing your adversaries. If you number Google amongst that list, life is going to be really difficult - no matter who you are.

Indeed, but the point is that it's the combination of using GCM and their software that makes this a problem. Because not only does Google know what you're sending, but who you're sending it too, because they have both the OS and the network, they can correlate.

I mean yes, it's basically impossible to do this. Even if you used a completely free OS, you still have radio chips to contend with etc.

Re: About backdoors in crypto messengers

#17

>tl;dr: There is a “backdoor” in Signal nobody cares about, only Google can use it. Speak for yourself. This backdoor is the reason why I don't use Signal.

Doesn't Google have root anyway? They could backdoor your OS and grant a third party access to phone through that.

Re: About backdoors in crypto messengers

#18

>tl;dr: There is a “backdoor” in Signal nobody cares about, only Google can use it. Speak for yourself. This backdoor is the reason why I don't use Signal.

Doesn't Google have root anyway? They could backdoor your OS and grant a third party access to phone through that.

Only if you have them installed on your phone - I don't.

Re: About backdoors in crypto messengers

#19
post #4

If you're considering Google an adversary, perhaps you shouldn't use stock Android, or any of their software. If you're considering Google an adversary, and use a version of Android without Google support, you can't use Signal anyway.

Actually, it is possible to use Signal on Android without Google using the opensource microG and Xposed framework (setup is a bit involved...but you can google that :P for a guide).

https://microg.org/ wow never knew about this

Re: About backdoors in crypto messengers

#20
post #4

If you're considering Google an adversary, perhaps you shouldn't use stock Android, or any of their software. If you're considering Google an adversary, and use a version of Android without Google support, you can't use Signal anyway.

Even with stock Android, on devices != Pixel or Nexus, Google parts are sandboxed in a way making it hard for them to access private app data. The only way would be to deliver a different app through play store which is easy to discover as it breaks the cryptographic signature and must be done on first install (android uses TOFU).

So without the mentioned issues through Play Services and Gboard, Google would not be able to access your Signal messages. On Stock Nexus/Pixel builds they can of course push updates that change this...

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