Security and authentication are an increasingly essential part of web development.
PKI enabled systems depend on digital certificates, electronic credentials issued by
a certificate authority (CA), to establish identity and trust. Many government
agencies and corporations are adopting PKI based security often implemented as smart
card based authentication. The smart card's security comes from two things, one you
know and one you own. This will be a guide towards implementing a PKI certificate
authentication system via Apache and MapServer to limit map requests to valid
authenticated users.