Re: Late comments on the msgtrk documents

[Steve Hole <steve.hole@xxxxxxxxxxxxxxxxxxx>]

On Thu, 01 Nov 2001 14:09:16 -0800 Eric Allman <eric+msgtrk@xxxxxxxxxxxx> 
wrote:

> Sorry for the delay.  I've taken Steve's suggestion and added the
> following paragraph into section 4.2:
> 
>            In some cases, the total length of (local-envid + fqhn + 1)
>       (for  the  `@'  sign)  may exceed the total acceptable length of
>       ENVID (100).  In this case, the fqhn SHOULD be replaced  by  the
>       SHA1(fqhn)  encoded  into  BASE64.   After encoding, the 160 bit
>       SHA-1 will be a 27 octet string, which limits local-envid to  72
>       octets.  Implementors are encouraged to use an algorithm for the
>       local-envid that is reasonably unique.  For example,  sequential
>       integers have a high probability of intersecting with sequential
>       integers generated by a different host, but a SHA-1 of the  cur-
>       rent  time  of day concatenated with the host's IP address and a
>       random number are unlikely to intersect with the same  algorithm
>       generated by a different host.

Sounds very good to me.

---
Steve Hole
Chief Technology Officer -  - Billing and Payment Systems
ACI Worldwide - MessagingDirect
<mailto:Steve.Hole@xxxxxxxxxxxxxxxxxxx>
Phone: 780-424-4922