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Re: time and date
On 12/2/97, men from black helicopters forced Carl Ellison to write:
>At 10:46 AM 11/26/97 +0200, Camillo Sdrs wrote:
>> Consider a (fictional) real-time
>>process control system that uses SPKI certs to queue control jobs. The
>>precision for some control actions may be in milliseconds. Applying such
>>an action at the wrong point in time can be catastrophic.
>These control functions might need microsecond or better precision. Yes?
>I personally think that the process control example is far fetched. If I
>were programming a process control application and I were forced to use
>times, I would prepare a file of control commands, each timed, and then I
>might sign the whole file with a properly empowered key. I just can't see
>turning each file entry into a separate SPKI certificate.
I agree. I have been thinking about how to interact with remote process control
hardware having done a bit of this in the past. I would send a macro file
that contains a start time and the relative times betwwen commands.
If I needed to specify microsecond times I would adopt a process control
language and send signed commands in that language..
Vinnie Moscaritolo tel: 415.524.6222 Pretty Good Privacy, Inc.
Senior Consulting Engineer main: 415.572.0430 2121 S. El Camino Real
<email@example.com> web: http://www.pgp.com San Mateo, CA 94403
DH Key: http://keys.pgp.com:11371/pks/lookup?op=get&search=0x070A5CFF
1 if by land, 2 if by sea.
Paul Revere - encryption 1775