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Re: [Cfrg] Multi-recipient public key authenticated encryption

Peter Gutmann <pgut001@cs.auckland.ac.nz> Thu, 30 April 2020 09:29 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: Neil Madden <neil.e.madden@gmail.com>
CC: CFRG <cfrg@irtf.org>
Thread-Topic: [Cfrg] Multi-recipient public key authenticated encryption
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Date: Thu, 30 Apr 2020 09:29:38 +0000
Message-ID: <1588238978979.76541@cs.auckland.ac.nz>
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Subject: Re: [Cfrg] Multi-recipient public key authenticated encryption
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Neil Madden <neil.e.madden@gmail.com> writes:

>I’m struggling to understand why you’d think this is complicated.

Have you seen an end-user application built with Bouncy Castle that uses it
correctly?  I mean actually audited the code in the application to check that
they get it right?

(I've done code audits of programs that misuse DH/ECDH mechanisms for key
transport.  So far I've never found one that gets it right, and in several
cases I was unable to explain to the developers how to change their code to
use the mechanism securely.  I've had a writeup on this half-done for awhile
with the title "Libhairshirt vs libfootgun", really must get around to
finishing it).

Peter.

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