DNSSEC
A security extension that provides integrity verification for DNS responses through digital signatures, using RRSIG signatures and trust chain validation to prevent cache poisoning.
Timeline (last 90 days)
DNSSEC addresses DNS's fundamental flaw through digital signature mechanisms: traditional DNS responses have no integrity checking, so a man-in-the-middle can forge responses and steer users to malicious addresses (cache poisoning). With DNSSEC enabled, a zone generates an RRSIG signature for each record, and resolvers verify the signatures along the chain of trust, setting the AD flag in the response header only if verification passes.
DNSSEC has quite a few pain points in real deployments: complex key rotation operations, algorithm expiration (such as the early SHA-1 signing scheme), synchronization delays of DS records between some registrars and registries, and old resolvers not supporting validation, all of which can cause a domain to be signed but not effective or to be misjudged as insecure.
Cloudflare has reminded users that the DNS root zone KSK is scheduled to rotate on October 11, and resolvers performing DNSSEC validation must trust the new key before the switchover.
Recursive resolvers performing DNSSEC validation must add the new KSK to their trust anchor list in advance; otherwise, after the old key is retired, they will be unable to verify signatures and will return SERVFAIL errors.
All Facts (4)
DNSSEC addresses DNS's fundamental flaw through digital signature mechanisms: traditional DNS responses have no integrity checking, so a man-in-the-middle can forge responses and steer users to malicious addresses (cache poisoning). With DNSSEC enabled, a zone generates an RRSIG signature for each record, and resolvers verify the signatures along the chain of trust, setting the AD flag in the response header only if verification passes.
50%UnverifiedDNSSEC has quite a few pain points in real deployments: complex key rotation operations, algorithm expiration (such as the early SHA-1 signing scheme), synchronization delays of DS records between some registrars and registries, and old resolvers not supporting validation, all of which can cause a domain to be signed but not effective or to be misjudged as insecure.
50%UnverifiedRecursive resolvers performing DNSSEC validation must add the new KSK to their trust anchor list in advance; otherwise, after the old key is retired, they will be unable to verify signatures and will return SERVFAIL errors.
50%UnverifiedCloudflare has reminded users that the DNS root zone KSK is scheduled to rotate on October 11, and resolvers performing DNSSEC validation must trust the new key before the switchover.
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