What does DNSSEC protect against?
DNSSEC is designed to protect Internet resolvers (clients) from forged DNS data, such as that created by DNS cache poisoning. Currently, a DNS resolver sends a query out to the Internet and then accepts the first response it receives, without question. If a malicious system were to send back an incorrect response, the resolver would use this address until its cache expired. This is bad enough if it’s a single user’s computer that gets this bad data, it’s much worse if it’s another name server that answers queries for an ISP – affecting thousands of users.
