S. Blake-Wilson, G. Karlinger, T. Kobayashi, Y. Wang.     <a href="http://www.ietf.org/rfc/rfc4050.txt"><cite>Using the Elliptic Curve Signature Algorithm (ECDSA) for XML Digital Signatures.</cite></a>IETF RFC 4050. April 2005. URL: <a href="http://www.ietf.org/rfc/rfc4050.txt">http://www.ietf.org/rfc/rfc4050.txt</a>