[core] I-D Action: draft-ietf-core-echo-request-tag-13.txt

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Subject: [core] I-D Action: draft-ietf-core-echo-request-tag-13.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Constrained RESTful Environments WG of the IETF.

        Title           : CoAP: Echo, Request-Tag, and Token Processing
        Authors         : Christian Amsüss
                          John Preuß Mattsson
                          Göran Selander
	Filename        : draft-ietf-core-echo-request-tag-13.txt
	Pages           : 38
	Date            : 2021-07-12

   This document specifies enhancements to the Constrained Application
   Protocol (CoAP) that mitigate security issues in particular use
   cases.  The Echo option enables a CoAP server to verify the freshness
   of a request or to force a client to demonstrate reachability at its
   claimed network address.  The Request-Tag option allows the CoAP
   server to match block-wise message fragments belonging to the same
   request.  This document updates RFC 7252 with respect to the client
   Token processing requirements, forbidding non-secure reuse of Tokens
   to ensure binding of response to request when CoAP is used with a
   security protocol, and with respect to amplification mitigation,
   where the use of Echo is now recommended.

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