![]() Use a device which is suitably isolated from any communication channel for actually decrypting/encrypting your message, and then the actual phone modem need not be trusted. By today's standards, it comes down to two general options, each with their own points of vulnerability: While the short answer is a quick "NO", there is some room for using a digital device to communicate securely. These backdoors are stealthy and unaware to the host OS but if they are not obscure enough, they can be caught. As it runs outside of host OS it can install debugger in any app to listen app data in memory. It protects encryption key like for the Signal message store, app password, biometric data etc. Compromised TEE can decrypt any secrets for the attacker that it is supposed to protect. From there secure boot flow can be compromised down to the OS.Įvery SoC comes with Trusted Execution Environment (TEE) which has unrestricted access to the host OS. Chipmakers can also install backdoor in primary bootloader which boots SoC and act as root of trust. If the OEM seems to be trusted then the chipmaker can act in bad faith like installing embedded hardware debugger which listens on embedded cables, can host a server and use NIC for internet access. If these were flashed in compromised state, it gives an attacker same level of privilege as the kernel. In android device, you may trust OS because of its kernel source but drivers and firmwares are proprietary. ![]() There's no direct way to find out where the backdoor could be. You have to put some level of trust somewhere in the chain. The only ways to protect yourself from compromised hardware would be to have your data encrypted before it gets to the hardware (type encrypted data into the device, which would be a whole lot of effort to do right, or possibly use a trusted device which sends encrypted data to it, which is basically how you normally use encryption to protect yourself from the compromised internet) or to just not use that hardware. This is typically where keyloggers reside. Similarly, when receiving data, it also wouldn't be encrypted as it's what you're actually hearing or seeing. Step 2 would be the obvious weak point as the phone can see it but there is no encryption because the app doesn't even know about the data yet. The other device's firmware receives it and steps 1 to 5 happen in reverse on that side.This data is then sent back to the phone's firmware to send it across the network.This application then encrypts the data.This is then sent to the application you're using.into some key codes, characters, screen coordinates, etc. ![]() This goes through the phone's firmware / operating system to turn you touching the screen, pressing a button, etc.You type or say something into the phone. ![]() When you use encryption, it goes something like this: No, the device can see anything you can see, so if it's compromised, using encryption wouldn't protect you against that specifically. ![]()
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