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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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Thank you for the explanation. So what I understand in simple terms, it is difficult to make a secure OS for a particular device when there are vulnerabilities in the hardware of that device.
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There's no ROM for the Nexus 5 with anything close to full security for drivers or firmware. It has hundreds of unresolved serious security bugs. It's not a safe device, regardless of which OS you use on it. All these ROMs also substantially reduce security compared to AOSP too.
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If you care about security, you need to use a device that isn't end-of-life. Shipping the AOSP security updates is not shipping full security updates. Those ROMs explicitly lie to you about the security patch level. The security bulletins include far more issues than they fix...
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Even on a device where full security updates are available *and* the ROM ships all the security updates (i.e. they actually bundle all the updated firmware and drivers, which is rare), they usually lack a security update model and roll back / damage security features in AOSP.
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AOSP on a Pixel can be as secure as the stock OS, but only when doing signed production builds with all the security features left intact, verified boot enabled after flashing (via locking the bootloader) and properly secured signing keys for signing builds (ideally an HSM).
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Everything involving Android is based on AOSP. It's a silly statement. As I explained, there is no secure ROM available for the Nexus 5. Any claiming to have the latest security patch is being dishonest (quite concerning!), because they don't have the driver and firmware updates.
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