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The RRSIG record is a digital signature of the answer DNS resource record set.The digital signature is verified by locating the correct public key found in a DNSKEY record.Say that a recursive resolver such as an ISP name server wants to get the IP addresses (A record and/or AAAA records) of the domain " First, if "example.com" does not support DNSSEC, there will be no RRSIG record in the answer and there will not be a DS record for "example.com" in the "com" zone.If there is a DS record for "example.com", but no RRSIG record in the reply, something is wrong and maybe a man in the middle attack is going on, stripping the DNSSEC information and modifying the A records.

As documented in IETF RFC 4367, some users and developers make false assumptions about DNS names, such as assuming that a company's common name plus ".com" is always its domain name.The following table defines, as of April 2013, the security algorithms that are most often used: From the results of a DNS lookup, a security-aware DNS resolver can determine whether the authoritative name server for the domain being queried supports DNSSEC, whether the answer it receives is secure, and whether there is some sort of error.The lookup procedure is different for recursive name servers such as those of many ISPs, and for stub resolvers such as those included by default in mainstream operating systems.It is widely believed For it to place any real reliance on DNSSEC services, this stub resolver must trust both the recursive name servers in question (which is usually controlled by the ISP) and the communication channels between itself and those name servers, using methods such as IPsec (use of which is DNSSEC works by digitally signing records for DNS lookup using public-key cryptography.The correct DNSKEY record is authenticated via a chain of trust, starting with a set of verified public keys for the DNS root zone which is the trusted third party.

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