W. Polk, R. Housley, L. Bassham. <a href="http://www.ietf.org/rfc/rfc3279.txt"><cite>Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile</cite></a>. April 2002. Internet RFC 3279. URL: <a href="http://www.ietf.org/rfc/rfc3279.txt">http://www.ietf.org/rfc/rfc3279.txt</a>