I need a Pixel 3 for advancing my mobile security research. I don't have access to a current generation mobile device with a Snapdragon 845, the Linux 4.9 LTS with CFI and a StrongBox keymaster implementation.
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A user build of AOSP using github.com/anestisb/andro that's signed with properly secured release keys.
It needs to be a phone with full security updates available and support for using hardware security features with another OS. Can't do much if the hardware has garbage security.
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I strongly suggest using either an iPhone or a Pixel with the stock OS. There is no alternative OS with decent security and binary releases available to install. You would need to build AOSP for a device like a Pixel where it can be done securely or find someone to do it for you.
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I was the one that created and maintained it, almost entirely on my own. It offered substantially more privacy and security than the stock OS. It couldn't offer a longer support period since it relied on the same security updates. It's no longer the same thing that it was before.
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Finally you admitted that there are ROMs better than stock ROMs :)
Do not be upset with me for thinking differently and wanting to do differently.
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I just want to say a few more things.
It's possible relock the Bootloader after flash a new rom.
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Only Nexus and Pixel phones support locking the bootloader with an alternate OS. I'm obviously aware of that since I worked on an alternate OS preserving the security model used by the stock OS and AOSP. There's no point in locking it if the OS being used breaks that security.
Third party recovery images like TWRP don't preserve the security model and it's entirely pointless to lock the bootloader. It also prevents updating them since the OS won't be doing it. You're also missing that on modern devices that can have basic security verified boot exists.
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Nexus 5X/6P and Pixel phones fully support verified boot for other operating systems and enable it when the bootloader is locked. Having a mismatched recovery or a tampered OS (i.e. sideloaded gapps) aren't compatible. LineageOS, etc. don't include verified boot support either.
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Yes I know that, thats why I do not want to use the Nexus 5 stock Rom because it has too many vulnerabilities and it's not optimized to use the maximum power of the Nexus 5 and also the battery drains very fast ......
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there are recent modified roms that consume less battery without compromising performance