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<HEAD><TITLE>Appendix B - The X.509 Certificate</TITLE>
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<H2><A NAME="codesign_0001090107000000">Appendix B - The X.509 Certificate</A></H2>
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<P>The X.509 protocols include a structure for public-key certificates. A CA assigns a unique name to each user and issues a signed certificate containing this name and the user's public key. The following diagram shows an X.509 certificate.
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<B>X.509 Certificate</B>
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<P>These are the meanings for each field.
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2"><B>Field</B></FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2"><B>Meaning
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Version</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Identifies the certificate format.
</FONT></TD>
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Serial Number</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Is unique to the CA.
</FONT></TD>
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Algorithm Identifier</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Identifies the algorithm used to sign the certificate, together with any necessary parameters.
</FONT></TD>
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Issuer</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">The name of the CA.
</FONT></TD>
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Period of Validity</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">A pair of dates. The certificate is valid during the time period between the two.
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Subject</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">The name of the user.
</FONT></TD>
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<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Subject's Public Key</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Contains the public key algorithm name, any necessary parameters, and the public key.
</FONT></TD>
</TR>
<TR><TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">Signature</FONT></TD>
<TD ALIGN=LEFT VALIGN=TOP><FONT FACE="ARIAL,HELVETICA" SIZE="2">The CA's signature.
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