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Re: [dtn] Alert-Verify-Sender: Re: [EXT] Re: Status of AUTH48 Documents (and a request)

sburleig.sb@gmail.com Mon, 13 December 2021 23:08 UTC

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From: sburleig.sb@gmail.com
To: 'Carsten Bormann' <cabo@tzi.org>, Felix.Flentge@esa.int
Cc: "'Sipos, Brian J.'" <Brian.Sipos@jhuapl.edu>, dtn@ietf.org, "'Birrane, Edward J.'" <Edward.Birrane@jhuapl.edu>
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Date: Mon, 13 Dec 2021 15:07:54 -0800
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Subject: Re: [dtn] Alert-Verify-Sender: Re: [EXT] Re: Status of AUTH48 Documents (and a request)
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Most of the arrays in a bundle are best encoded with definite lengths, but I think an argument can be made that using an indefinite-length array as the overall structure of a bundle simplifies implementations in a useful way.

The reason for this is that extension blocks may be added to and removed from a bundle as the bundle makes its way toward its destination.  If bundles were definite-length arrays, then the length of that array would need to be re-computed and re-encoded immediately before transmission at every forwarding point.

Certainly this is doable, but it's a little bit of additional work and one more place where errors in implementation can be introduced.  It's not clear to me that it would offer any compensating advantages.

Scott

-----Original Message-----
From: dtn <dtn-bounces@ietf.org> On Behalf Of Carsten Bormann
Sent: Sunday, December 12, 2021 11:45 PM
To: Felix.Flentge@esa.int
Cc: Sipos, Brian J. <Brian.Sipos@jhuapl.edu>; dtn@ietf.org; Birrane, Edward J. <Edward.Birrane@jhuapl.edu>
Subject: Re: [dtn] Alert-Verify-Sender: Re: [EXT] Re: Status of AUTH48 Documents (and a request)

On 2021-12-13, at 08:40, Felix.Flentge@esa.int wrote:
> 
> (Maybe even 'allowed' it to weak in this case and could be replaced by 'mandatory'.) 

Maybe not with that wording, but…
Is there a reason for allowing both definite and indefinite length at that level?

Grüße, Carsten

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