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<p class="MsoNormal">Relevant to the work of the SMCWG, Apple has made updates to its Certificate Program requirements, some of which impact S/MIME Certificates:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.25in">Effective April 1, 2022, S/MIME certificates must:<o:p></o:p></p>
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<![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>include the emailProtection EKU<o:p></o:p></p>
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<![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>include at least one subjectAlternativeName rFC822Name value containing an email address<o:p></o:p></p>
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<![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>not have a validity period greater than 1185 days<o:p></o:p></p>
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<![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>use a signature hash algorithm of greater than or equal strength to SHA-256 (see section 7.1.3.1 and 7.1.3.2 of the CA/B Forum$B!G(Bs Baseline Requirements).<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>meet the following key size requirements:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>For RSA key pairs, the modulus size must be at least 2048 bits when encoded and its size in bits must be evenly divisible by 8.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>For ECDSA key pairs, the key must represent a valid point on the NIST P$B!>(B256, NIST P$B!>(B384 or NIST P$B!>(B521 named elliptic curve.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The full detail is at <a href="https://www.apple.com/certificateauthority/ca_program.html">
https://www.apple.com/certificateauthority/ca_program.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards, Stephen<o:p></o:p></p>
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