alt Hacker News> DNSSEC actually makes DNS more decentralized: without DNSSEC, the only way to guarantee a trustworthy response is to directly ask the authoritative nameservers. But with DNSSEC, you can query third-party caching resolvers and still be able to trust the response because only a legitimate answer will have a valid signature.
but how would one verify the signature if the DNSKEY expired and you cannot fetch a fresh one because the organisation providing those keys is down? As far as I understood the TTL for those keys is different and for DENIC it seems to be 1h [0]. So if they are down for more than an hour and all RRSIG caches expire, DNS zones which have a higher TTL than 1h but use DNSSEC would also be down?
[0] dig RRSIG de. @8.8.8.8
de. 3600 IN RRSIG DNSKEY 8 1 3600 20260519214514 20260505201514 26755 de. [...]
> but how would one verify the signature if the DNSKEY expired and you cannot fetch a fresh one because the organisation providing those keys is down?
In theory, this shouldn't happen, because if you use the same TTLs for your DNSSEC records and your "regular" records, then if the regular records are present in the cache, the DNSSEC records will be too.
> So if they are down for more than an hour and all RRSIG caches expire, DNS zones which have a higher TTL than 1h but use DNSSEC would also be down?
Yes, but I'd argue that the DNSSEC records should have the same TTLs for exactly this reason. That's how my domain is set up at least: