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We implemented 2 types of prototype systems using Perl language. The first type was
implemented using fork function. In this type, when the system receives a DNS query,
a child process will be created and the child process conducts the normal query and
the query on the previously proposed client based DNSSEC validation system. The
second type was implemented by creating a specific name resolution process. In this
type, the specific process conducts normal DNS query and the previously proposed
client based DNSSEC validation system works as usual. As a result, two processes
reply DNS responses individually. We evaluated the two types of prototype systems
and compared them with the conventional DNS name resolution method.
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