[time-nuts] webcam app to watch for and time stamp changes

lists at lazygranch.com lists at lazygranch.com
Sat Mar 2 16:29:05 EST 2013

If you think about it, there would have to be some time correction if only because these fobs can't be all that accurate in maintaining time. That is, they would be no better than a watch. 

I'm not so keen on wearing out the internal battery since these things are now $30 instead of $5 when paypal introduced them. 
-----Original Message-----
From: Jim Lux <jimlux at earthlink.net>
Sender: time-nuts-bounces at febo.com
Date: Sat, 02 Mar 2013 13:18:36 
To: <time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] webcam app to watch for and time stamp changes

On 3/2/13 1:10 PM, Peter Gottlieb wrote:
> I had one for work a while back and asked the IT security guys about it
> and was told that the change was on a fixed schedule but of course each
> fob was a little different due to temperature, over time, etc and that
> the system automatically "learned" the fobs and opened or tightened its
> tolerance for when the fobs updated.  So if you had a slow one the
> system would adapt over time and just learn to expect that but if the
> timing got too far off they would replace the fob.  I suppose if you
> kept messing with the timing by leaving in the sun or freezer eventually
> you would get rejected logins and your IT people would want to replace
> it, unless they manually really loosened up the timing windows.  The
> people I asked didn't mind my inquiries and seemed eager to chat but
> some places might be a bit more paranoid.

The explanation in RSA's manuals is more like..

You set a tolerance window.. how many codes before/after are you willing 
to accept.  When it accepts your code, it resynchronizes it's master 
timer (for your fob) to whatever you just entered.    It doesn't go so 
far as to try and adjust the "rate", just the "offset".

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