Re: Late comments on the msgtrk documents

On Mon, 15 Oct 2001 16:57:53 -0700 Eric Allman <[email protected]> 
wrote:

> 
> Interesting idea -- create (locally) the full
> 
> 	[email protected]
> 
> which can be arbitrarily long, and then SHA1 it so you get something
> manageable.  This would make it fit into the existing definition of
> ENVID.  Unfortunately, the failure mode could be nasty, assuming
> the server discards duplicates.

I would suggest that we make a recommendation that FQDN is a good 
candidate for generating uniqueness.   Further, if the FQDN can't be used 
directly because it is too long, then a SHA1 hash of the FQDN is a 
suitable substitute.   It is further recommended that the application 
create the lhs of the envid such that it conveys uniqueness over a large 
set of possibilities.  The combination is *very* likely to be unique.

If the fqdn can't be used because it is not reliable or doesn't make sense
(the allocated address scenario), then it is left to the application to 
provide unique information. 

Cheers.
---
Steve Hole
Chief Technology Officer -  - Billing and Payment Systems
ACI Worldwide - MessagingDirect
<mailto:[email protected]>
Phone: 780-424-4922