I really don’t see the need for dry run at all as hundreds of thousands of 
zones have been signed without it but if is going to exist we don’t need to 
half the small code point space which is the natural result of not doing 
something like I’m suggesting. 

One can test if the zone is properly signed by installing trust anchors in 
recursive servers you control and have your applications use them.   This is 
much less complicated than expecting validators to be updated to soft fail on 
this/these new algorithm(s).   They are already complicated pieces of software 
that have to check lots of things.  Adding more to this will make them even 
more complicated.  Remember answers come from multiple zones and they depend on 
even more zones.  DMARC is trivial compared to DNSSEC validation. 

What does it mean if a parent zone turns on dry run?  

People keep mentioning DMARC. That is trivial compared to this. 
-- 
Mark Andrews

> On 18 Jul 2024, at 18:47, libor.peltan <libor.pel...@nic.cz> wrote:
> 
> 
> My point was that
> 
> example.com. IN DS 49172 13 130 
> e2c8c32fb3c40586e0dabc367bfde4368b8dff52a7ffc60f619c720ec7767320
> example.com. IN DS 49172 13   2 
> e2c8c32fb3c40586e0dabc367bfde4368b8dff52a7ffc60f619c720ec7767320
> 
> is more equivalent (i.e. the change from the first to the second looks safer 
> and more straightforward) than
> 
> example.com. IN DS 49172 13 7 
> 02e2c8c32fb3c40586e0dabc367bfde4368b8dff52a7ffc60f619c720ec7767320
> example.com. IN DS 49172 13 2 
> e2c8c32fb3c40586e0dabc367bfde4368b8dff52a7ffc60f619c720ec7767320
> 
> /Libor
> 
> Dne 18. 07. 24 v 10:27 Mark Andrews napsal(a):
>> It would look like a regular DS. The only difference would be that the first 
>> byte of the digest would contain the sub type.   This is just internal 
>> structure of the digest. 
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