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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Hey Corey, Hey All,<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Agreed – would be good to clarify that right off the bat. Is there a reason why multiple instances of the S field should be supported? For the organisational Identifier the different registration schemes are a valid point.<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Generally, I’d say that having multiple instances of attributes present significantly complicates validation and increases the risk of the certificate representing outdated information at some point during its validity. But given your argument for OID and the widespread use of multiple OU for all sorts of information it might be yet another case of something we’d want to avoid for “Strict” and allow for other profiles?<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Best,<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Seb<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span lang=EN-US style='font-family:"Arial",sans-serif;color:#666666;mso-fareast-language:EN-US'>Sebastian Schulz</span></b><span lang=EN-US style='color:#1F497D;mso-fareast-language:EN-US'><br></span><i><span style='font-family:"Arial",sans-serif;color:#666666'>Product Manager Client Certificates</span></i><span lang=EN-US style='mso-fareast-language:EN-US'><o:p></o:p></span></p></div><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> Smcwg-public <smcwg-public-bounces@cabforum.org> <b>On Behalf Of </b>Corey Bonnell via Smcwg-public<br><b>Sent:</b> 13 July 2021 15:16<br><b>To:</b> SMIME Certificate Working Group <smcwg-public@cabforum.org><br><b>Subject:</b> [Smcwg-public] Cardinality of subject fields<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Hello,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>When reviewing the proposed set of allowed/required subject fields for the profiles we have discussed this far, I realized that there is room for better clarity regarding the allowed number of each attribute type that may be present in each subject. For example, the current specification leaves it unclear whether multiple CN attributes may be present in the subject Name. The cardinality of each attribute type is currently left unstated in the TLS BRs, which has led to a lack of clarity and disagreements on the allowed number of various attribute types.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>To prevent this confusion and provide concrete written guidance, I suggest that we add a column to the profiles spreadsheet that indicates whether multiple instances of an attribute type are allowed.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>To start, I propose that the following attributes be allowed to appear more than once:<o:p></o:p></span></p><ul style='margin-top:0cm' type=disc><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo3'><span lang=EN-US>OU (if we decide to allow its presence at all)<o:p></o:p></span></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo3'><span lang=EN-US>streetAddress<o:p></o:p></span></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo3'><span lang=EN-US>organizationalIdentifier (if different registration schemes are specified)<o:p></o:p></span></li></ul><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>All other attribute types must not appear more than once in each subject.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thoughts?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Corey</span><span lang=EN-US style='font-family:"Arial",sans-serif;color:#686869'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>