Microsoft KB Archive/191549

= MIME Parts and Message Source for a Digitally Signed Message =

Article ID: 191549

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q191549



SUMMARY
The following example describes what the MIME parts and message source will look like for a signed message.   X-Mailer: Microsoft Outlook Express 4.71.0729.0

From: "Ryan LaBrie" 

To: "steven@somecompany.com" 

Subject: signed message

Date: Wed, 30 Apr 1997 20:37:03 -0700

X-Priority: 3

X-MSMail-Priority: Normal

MIME-Version: 1.0

Content-Type: multipart/signed;

boundary="=_NextPart_000_01BC55A9.8FA8A740";

micalg=sha1;

protocol=application/x-pkcs7-signature

X-MimeOLE: Produced By Microsoft MimeOLE Engine V4.71.0728.0

NOTE - This is a multi-part message in MIME format.

--=_NextPart_000_01BC55A9.8FA8A740

Content-Type: multipart/alternative;

boundary="=_NextPart_001_01BC55A9.8FAA2DE0"

--=_NextPart_001_01BC55A9.8FAA2DE0

Content-Type: text/plain;

charset="iso-8859-1"

Content-Transfer-Encoding: quoted-printable

NOTE - This is a clear signed message.

--=_NextPart_001_01BC55A9.8FAA2DE0

Content-Type: text/html;

charset="iso-8859-1"

Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML 3.2//EN">











This is a clear signed message =

hopefully...



</HTML>

--=_NextPart_001_01BC55A9.8FAA2DE0--

--=_NextPart_000_01BC55A9.8FA8A740

Content-Type: application/x-pkcs7-signature;

name="smime.p7s"

Content-Transfer-Encoding: base64

Content-Disposition: attachment;

filename="smime.p7s"

MIIGTAYJKoZIhvcNAQcCoIIGPTCCBjkCAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3DQEHAaCC BTsw

ggU3MIIEoKADAgECAhBO9j8bsMhfLRsKSiktdU5hMA0GCSqGSIb3DQEBBAUAMGIxETAPBgNV BAcT

CEludGVybmV0MRcwFQYDVQQKEw5WZXJpU2lnbiwgSW5jLjE0MDIGA1UECxMrVmVyaVNpZ24g Q2xh

c3MgMSBDQSAtIEluZGl2aWR1YWwgU3Vic2NyaWJlcjAeFw05NzAyMjAwMDAwMDBaFw05ODAy MjAy

. (lots of content deleted)

--=_NextPart_000_01BC55A9.8FA8A740-- The last part of the message is the signed hash of the message and is sent using the content-transfer-encoding type of Base64 which will allow the transmission of 8-bit data encoded in a 7-bit format. Hence, it is quite unreadable. This part of the message is listed as an attachment with the filename smime.p7s. Mail clients that are not S/MIME aware will display this file as an attachment. If the message is received by an S/MIME aware client, there will not be a visible attachment. In addition, in the above message, the certificate was included and would be available for importing into the Windows Address Book.

Keywords: kbhowto kbinfo KB191549

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