[rfc-dist] RFC 8750 on Implicit Initialization Vector (IV) for Counter-Based Ciphers in Encapsulating Security Payload (ESP)

rfc-editor at rfc-editor.org rfc-editor at rfc-editor.org
Wed Mar 11 15:55:12 PDT 2020

A new Request for Comments is now available in online RFC libraries.

        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.migault at ericsson.com, 
                    guggemos at nm.ifi.lmu.de, 
                    ynir.ietf at 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 
standardization state and status of this protocol.  Distribution of this 
memo is unlimited.

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