[time-nuts] Most accurate small crystal

Poul-Henning Kamp phk at phk.freebsd.dk
Thu May 27 06:28:08 UTC 2010

In message <AANLkTimNBz5wwBJ8dR0_eNZrFPxcKWlklxFCa7cx6yV9 at mail.gmail.com>, Jim 
Palfreyman writes:

>I have timed the accuracy of this internal clock and have found it to be
>pretty good so far. 17 days ago it was ticking over at 21.8 sec past the
>minute and a quick visual inspection today and it was still *very* close to
>that. I will confirm it properly tonight.

Being able to model the clock of each device precisely is a very important
part of the security of these devices.

The important part there, is that the clock runs at a constant rate,
but the exact value of the rate is not important, as long as the
bounds are known.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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