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Re: High Resolution Time 2: time origin and worker support

From: Christine Runnegar <runnegar@isoc.org>
Date: Tue, 17 Nov 2015 18:36:29 +0000
To: Philippe Le Hegaret <plh@w3.org>
CC: "public-privacy (W3C mailing list)" <public-privacy@w3.org>
Message-ID: <39AF8A59-02BD-4B9C-96B6-3FBD8B377782@isoc.org>
Thanks Philippe.

We will add this to agenda for the next PING call (3 December 2015 at UTC 17). 

In the meantime, if anyone has initial feedback and/or questions, please post them on this list.

Christine

> On 17 Nov 2015, at 2:59 pm, Philippe Le Hegaret <plh@w3.org> wrote:
> 
> The latest version of High Resolution Time is ready for wide review.
> 
> One can find the latest draft at:
>  http://www.w3.org/TR/hr-time-2/
> 
> High Resolution Time Level 2 replaces the first version of High Resolution Time [HR-TIME] and includes:
> 
> * Defines a precise definition of time origin for the purpose of all performance timeline related specifications;
> 
> * Provides the base definition for the Performance interface, including support for the Performance.now method in Web Workers [WORKERS];
> 
> * Introduces the method Performance.translateTime to compare times between different time origins;
> 
> * To mitigate cache attacks, the recommended minimum resolution of the Performance interface should be set to 5 microseconds.
> 
> The method Performance.translateTime is marked as "at risk" to the purpose of moving High Resolution Time 2 to W3C Recommendation due to its lack of implementation experience. It is expected to be deferred until the next release at the moment.
> 
> [[
> 8. Privacy and Security
> 
> Cache attacks and statistical fingerprinting is a privacy and security concern where a malicious web site may use high resolution timing data of various browser or application-initiated operations to identify a particular user - see [CACHE-ATTACKS]. To mitigate such attacks, the recommended minimum resolution of the Performance interface should be set to 5 microseconds.
> ]]
> http://www.w3.org/TR/hr-time-2/#privacy-security
> 
> New issues are welcome at
> https://github.com/w3c/hr-time/issues
> 
> Thank you,
> 
> Philippe
> 
Received on Tuesday, 17 November 2015 18:37:01 UTC

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