Thanks Alexey. The text will now read 

      [...] both the PPK and the PPK_ID strings be limited
      to the base64 character set, namely the 64 ASCII [RFC0020]
      characters 0-9, A-Z, a-z, + and /.


-----Original Message-----
From: IPsec <ipsec-boun...@ietf.org> On Behalf Of Alexey Melnikov via
Datatracker
Sent: Tuesday, January 07, 2020 1:16 PM
To: The IESG <i...@ietf.org>
Cc: ipsec@ietf.org; ipsecme-cha...@ietf.org; david.walterm...@nist.gov;
draft-ietf-ipsecme-qr-ik...@ietf.org
Subject: [IPsec] Alexey Melnikov's No Objection on
draft-ietf-ipsecme-qr-ikev2-10: (with COMMENT)

Alexey Melnikov has entered the following ballot position for
draft-ietf-ipsecme-qr-ikev2-10: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thank you for this document. One small suggestion below:

5.1.  PPK_ID format

   o  PPK_ID_FIXED (2) - in this case the format of the PPK_ID and the
      PPK are fixed octet strings; the remaining bytes of the PPK_ID are
      a configured value.  We assume that there is a fixed mapping
      between PPK_ID and PPK, which is configured locally to both the
      initiator and the responder.  The responder can use the PPK_ID to
      look up the corresponding PPK value.  Not all implementations are
      able to configure arbitrary octet strings; to improve the
      potential interoperability, it is recommended that, in the
      PPK_ID_FIXED case, both the PPK and the PPK_ID strings be limited
      to the base64 character set, namely the 64 characters 0-9, A-Z,
      a-z, + and /.

In order to avoid any doubt, I suggest you make it clear that you mean ASCII
encoding here. For this you should add a normative reference to RFC 20 in
the last quoted sentence.


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