The SIG or "signature" resource record (RR) is the fundamental way that data is authenticated in the secure Domain Name
System (DNS). As such it is the heart of the security provided.The SIG RR unforgably authenticates an RRset [RFC 2181]
of a particular type, class, and name and binds it to a time interval and the signer's domain name. This is done
using cryptographic techniques and the signer's private key. The signer is frequently the owner of the zone from which
the RR originated. The type number for the SIG RR type is 24.