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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: [email protected],
[email protected],
[email protected]
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
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