This document specifies the message handling for S/MIME 4.0.
The changes since S/MIME 3.2 include required support for
authenticated encryption, increased RSA key sizes, moving old
cryptographic algorithms to historic status, and requiring support
for AES-256 GCM, ChaCha200-Poly1305, SHA-512, ECDSA with P-256,
EdDSA, and Ed25519.
Working Group Summary:
There is strong consensus for this document in the LAMPS WG.
S/MIME has wide support, and several implementers have said that
they will implement the new features in this document.
Russ Housley is the document shepherd.
Eric Rescorla is the responsible area director.