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Syn_Attck ,

Signal is a great example of this but I don't think you'll find any ways to do it non-VoIP.

KillingAndKindess ,
@KillingAndKindess@lemmy.blahaj.zone avatar

My understanding of the way a phone call works leads me to believe the data would not survive the dynamic compression done at the various transmission points like towers, relays, or the occasional satellite. If neither party is moving and the towers in use do not change in load, it might be possible, but at that point you're more tethered down than if you used a VPN.

umami_wasbi , (edited )

Instead of fiddling with the limitation on Android set by Google, I think a custom crypto DAC/ADC would be far eaiser, though you need both hard and software knowledge to accomplish this. It also came with the added benefit of not processing cryptographic operations on a black box.

Still, I don't know what goal you want to achieve and threat model is. If you are just curious if this possible, the answer will be ye with tons of hops amd hacks. If you really want security, I will advise you go another route.

MrSoup OP ,
@MrSoup@lemmy.zip avatar

Just curious really, would be cool using cellular network with an encrypted signal. Here some telcom companies offers infinite calls minutes but limited GBs of internet, so making voip calls would use those GBs.

ReversalHatchery ,

This should be possible to do it software, but I don't know about any apps or something else that deals with this. You would probably also need a rooted phone for it to work.

MrSoup OP ,
@MrSoup@lemmy.zip avatar

Why should I need a rooted phone? Can't dialer apps send whatever they want through cellular network?

umami_wasbi ,

Yes and no. Google put some limitation on the software side. For example, you can't do call record unless you're in a country isn't two party consent.

ReversalHatchery ,

Maybe I'm wrong, but I think it's not the dialer app that operates the microphone, or at least it does not have total control over it, to record something and pass something else to the system.

solrize , (edited )

non voip

I think this is not doable. You don't have access to the voice codec to start with, and the phone at the other end generally won't receive the bit stream coming out of it anyway. With a non-rooted phone it's hard to even get to the voice stream. You might be able to send subliminal encrypted text messages through a voice channel and that could be kind of cool, and hard to detect. That idea has been around for a while but I don't know of existing software that does it.

With VOIP, of course there are many encrypted systems available.

Added: also I assumed throughout that you meant present day mobile phones. With land phones at both ends, it may still be doable using dialup modems, but that was a 1990s thing and was pretty awful when you got down to it. It existed though.

noroute ,

[Thread, post or comment was deleted by the author]

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    MrSoup OP ,
    @MrSoup@lemmy.zip avatar

    I know Wire, but I asked for non voip solutions.

    catloaf ,

    https://en.wikipedia.org/wiki/Acoustic_coupler

    Slap your phone in one of those bad boys and go to town with your TST 3550 or whatever.

    As for cell phones, I don't think it's really supported. I'd recommend using a separate encrypted calling app, or getting a dedicated encrypted phone device.

    Scolding0513 ,

    there are some obscure hardware options for this but hardware based audio encryption is mostly just enterprise stuff, it's very difficult for a consumer to obtain

    MrSoup OP ,
    @MrSoup@lemmy.zip avatar

    Isnt enough software encryption like with voip calls (like telegram)?

    umami_wasbi ,

    It's on a different stack. Telegram (and VoIP) operates on the network stack, cellular call is working on the GSM/LTE stack. Networkin stack is more opened and free to do what you want; GSM/LTE stack have many proprietary tech that's is not open to everyone.

    shortwavesurfer ,

    Not that I'm aware of phone calls traversed the cellular network and are uncrypted. Okay, well that's not exactly true. They are encrypted, but the cellular network has the decryption key. That way nobody on the air can listen to the call, but the cell company can record it.

    MrSoup OP , (edited )
    @MrSoup@lemmy.zip avatar

    Can't the signal be encrypted first by client and then sent to cellular network?

    shortwavesurfer ,

    With audio encryption hardware, sure. Speak into that and feed its output to the mic on the phone

    ReversalHatchery ,

    I think they are interested in a purely software solution

    shortwavesurfer ,

    I think you're right. I know for a fact that I do not know of any, not for regular phone calls. Obviously if you want to use the internet and data, there's tons of options.

    Scolding0513 ,

    do you know of any purchasable equipment? I've never been able to find any, then again I'm not versed in such things too much

    shortwavesurfer ,

    I don't myself. So I am not sure.

    billbasher ,

    Yeah third party apps can do end to end encryption. It uses the data network and not the cellular network then though.

    Google Fi on Android actually does run E2E on calls https://fi.google.com/about/end-to-end-encrypted-calls/

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