[core] I-D Action: draft-ietf-core-echo-request-tag-00.txt

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This draft is a work item of the Constrained RESTful Environments WG of the IETF.

Title : Echo and Request-Tag
Authors : Christian Amsüss
John Mattsson
Göran Selander
Filename : draft-ietf-core-echo-request-tag-00.txt
Pages : 17
Date : 2017-10-30

Abstract:
This document defines two optional extensions to the Constrained
Application Protocol (CoAP): the Echo option and the Request-Tag
option. Each of these options when integrity protected, such as with
DTLS or OSCORE, protects against certain attacks on CoAP message
exchanges.

The Echo option enables a CoAP server to verify the freshness of a
request by requiring the CoAP client to make another request and
include a server-provided challenge. The Request-Tag option allows
the CoAP server to match message fragments belonging to the same
request message, fragmented using the CoAP Block-Wise Transfer
mechanism. This document also specifies additional processing
requirements on Block1 and Block2 options.


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https://datatracker.ietf.org/doc/html/draft-ietf-core-echo-request-tag-00


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