% Safe(r) Phones (draft)
% Michael Stone
% March 20, 2011

## Difficulties

I've been searching for a suitable cellphone for several years. Unfortunately,
I'm having trouble finding a phone that will work for me. Here are the
difficulties I see...

## Keeping Secrets

I'm looking for a phone to which I can entrust secrets. My budget is $5k.

Specific secrets that I imagine entrusting to my phone include:

  * passwords
  * SSH keys
  * credit card numbers and other PII
  * conversations
  * confidential documents and photos
  * my location

In order to feel more comfortable entrusting these secrets to my phone, I'd
like to see some specific hardware and software security features.

## Security Features

I desire the following hardware features:

  * at least one spare processor and memory which can be hard-reset without
    interfering with the main phone operation, sufficient in capacity to run a
    browser

  * a physical jumper that makes the boot flash read only when present

  * flip-flops wired in series with all cameras, microphones, and radios which, once
    flipped, remain flipped until they are physically reset and which, when
    flipped, light LEDs.

I desire the following software features:

  * boots with OpenFirmware,
  * the display is controlled via the main CPU

## tbd.

Explain the browser isolation architecture...