I-D Action: draft-ietf-ipsecme-implicit-iv-08.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 IP Security Maintenance and Extensions WG of the IETF.

        Title           : Implicit IV for Counter-based Ciphers in Encapsulating Security Payload (ESP)
        Authors         : Daniel Migault
                          Tobias Guggemos
                          Yoav Nir
	Filename        : draft-ietf-ipsecme-implicit-iv-08.txt
	Pages           : 8
	Date            : 2019-10-16

Abstract:
   Encapsulating Security Payload (ESP) sends an initialization vector
   (IV) in each packet.  The size of IV depends on the applied
   transform, being usually 8 or 16 octets for the transforms defined by
   the time this document is written.  Some algorithms such as AES-GCM,
   AES-CCM and ChaCha20-Poly1305 when used with IPsec, take the IV to
   generate a nonce that is used as an input parameter for encrypting
   and decrypting.  These algorithms require a unique IV but do not
   require an unpredictable IV.  As a result, the value provided in the
   ESP Sequence Number (SN) can be used instead to generate the nonce.
   This avoids sending the IV itself, and saves in the case of AES-GCM,
   AES-CCM and ChaCha20-Poly1305 8 octets per packet.  This document
   describes how to do this.


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