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<body lang="EN-US" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
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<p class="MsoNormal">TSA Certificate Validity Period<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">I did reach out to Oracle about revocation and time-stamping. The answer was that a signature is not trusted after the Code Signing certificate has expired or has been revoked. As
 such, even if the signature was time-stamped it would not be trusted if the Code Signing certificate is revoked or expired.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">TSA Rekey every 15 months<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">CSBR 9.4 states, “The Timestamp Authority MUST use a new Timestamp Certificate with a new private key no later than every 15 months to minimize the impact to users in the event that
 a Timestamp Certificate's private key is compromised. The validity for a Timestamp Certificate must not exceed 135 months. The Timestamp Certificate MUST meet the "Minimum Cryptographic Algorithm and Key Size Requirements" in Appendix A for the communicated
 time period.”<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">CSBR 16.1 (2) states, “A Timestamp Authority MUST protect its signing key using a process that is at least to FIPS 140-2 Level 3, Common Criteria EAL 4+ (ALC_FLR.2), or higher. The
 CA MUST protect its signing operations in accordance with the CA/Browser Forum’s Network Security Guidelines. Any changes to its signing process MUST be an auditable event.”<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">QUESTION - Why do we need to change the TSA private key with 15 months if the private key is protected the same way as a CA key (i.e., FIPS 140-2 Level 3 and NetSec)?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">The discussion on the call is that a TSA certificate is a leaf certificate, but since the key is managed the same as a Subordinate CA it seems to be more like a CA certificate.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Open for comments.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, Bruce.<o:p></o:p></p>
</div>
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