Re: [sensors] Security/privacy concerns beyond fingerprinting -- data exfiltration

In addition to generic mitigation strategies for [Security and Privacy](https://w3c.github.io/sensors/#security-and-privacy) concerns, we've made [prelimenary analysis](https://github.com/w3c/ambient-light/issues/13#issuecomment-302393458) of the attack vector identified by @iknik and have rough estimation of required resolution limits that mitigates the risk.

In addition to that, we are investigating even higher resolution limits [(4bit)](https://docs.google.com/document/d/1XThujZ2VJm0z0Gon1zbFkYhYo6K8nMxJjxNJ3wk9KHo) for some of the sensors.

The PIN skimming attacks and cross-origin communication are addressed in [Security and Privacy](https://w3c.github.io/sensors/#security-and-privacy) section and implemented in Chrome.

In addition to integration with Permission API, sensors are only accessible to secure, focused, visible, top-level browsing contexts.

@wseltzer @anssiko Does the specification address raised issue?

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Received on Thursday, 7 September 2017 07:40:06 UTC