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RFC 8750
Title: Implicit Initialization Vector (IV) for
Counter-Based Ciphers in Encapsulating
Security Payload (ESP)
Author: D. Migault,
T. Guggemos,
Y. Nir
Status: Standards Track
Stream: IETF
Date: March 2020
Mailbox: daniel.miga...@ericsson.com,
gugge...@nm.ifi.lmu.de,
ynir.i...@gmail.com
Pages: 8
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-ipsecme-implicit-iv-11.txt
URL: https://www.rfc-editor.org/info/rfc8750
DOI: 10.17487/RFC8750
Encapsulating Security Payload (ESP) sends an initialization vector
(IV) in each packet. The size of the IV depends on the applied
transform and is usually 8 or 16 octets for the transforms defined at
the time this document was written. When used with IPsec, some
algorithms, such as AES-GCM, AES-CCM, and ChaCha20-Poly1305, take the
IV to generate a nonce that is used as an input parameter for
encrypting and decrypting. This IV must be unique but can be
predictable. 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 8 octets per packet in the case of
AES-GCM, AES-CCM, and ChaCha20-Poly1305. This document describes how
to do this.
This document is a product of the IP Security Maintenance and Extensions
Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
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