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RFC 6376, "DomainKeys Identified Mail (DKIM) Signatures", September 2011

Source of RFC: dkim (sec)

Errata ID: 3758
Status: Rejected
Type: Technical

Reported By: Majid Tajamolian & Nazilla Karkon
Date Reported: 2013-10-20
Rejected by: Barry Leiba
Date Rejected: 2013-10-20

Section 3.6.1. says:

v= Version of the DKIM key record (plain-text; RECOMMENDED, default
      is "DKIM1").  If specified, this tag MUST be set to "DKIM1"
      (without the quotes).  This tag MUST be the first tag in the
      record.  Records beginning with a "v=" tag with any other value
      MUST be discarded.  Note that Verifiers must do a string
      comparison on this value; for example, "DKIM1" is not the same as
      "DKIM1.0".

It should say:

v= Version of the DKIM key record (plain-text; RECOMMENDED, default
      is "1").  If specified, this tag MUST be set to "1"
      (without the quotes).  This tag MUST be the first tag in the
      record.  Records beginning with a "v=" tag with any other value
      MUST be discarded.  Note that Verifiers must do a string
      comparison on this value; for example, "1" is not the same as
      "1.0".

Notes:

The "DKIM" prefix in the version field is unnecessary.
for example the followings are snipped from an actual email via gmail.com:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20120113;
h=mime-version:from:date:message-id:subject:to:content-type;
bh=46j07/8gDec8jTto/znsrAKiXDj6YJ7Wa2DCoZuhwXc=;
b=h6SViP6DcHgPwydJD6aztqyKd0UmCN3SdwmqZd0uCHmqrprphjN8qQ8AnBDhbwDhAa
DfHIDS8RSegELKtzsp95u+DnIFg1uNhIukKVpGT+9MqxfCSAFk7WpMe2O/2gcLruilTe
MxkKJ29s64NGevYewKtI8s73xHmbzD1NFH9ugdow8i9E16kgQ+vAx56qvbFTBwdEEw8I
6Bteu3tXEsYYbU/9Akm2GXS+6PFiDSbv47u3EmhRQIOK3e8DvcobrpicjL7vUwBCpQuf
J/c+Acdq4GZQoMoG9imzku0K2o0w33CZ1xUR1bARJKCVaJfWeHiEMQ2OJ9A6ZtqpyK0z
1Ftg==
--VERIFIER NOTES--
The reporters are confused. The text in Section 3.6.1 is about the key records in the DNS, and the document is correct. Section 3.5 is where the dkim-signature header field is described (and that is also correct).

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