Is there a particular reason CFB is being used in a new RFC?

Alex

On Wed, Jan 28, 2026 at 5:57 AM Robert Moskowitz via Cryptography-dev
<[email protected]> wrote:
>
> Paul,
>
> I note in the changelog that CFB is being moved to deprecated.
>
> Please review the use of CFB for "encrypt in place" for UAS Remote ID 
> Operator PII privacy:
>
> https://datatracker.ietf.org/doc/draft-moskowitz-drip-operator-privacy/
>
> Operator Privacy is being added into the next revision of ASTM F3411 Remote 
> ID and my draft is the only one put forward to provide this functionality.
>
> I don't know if this is enough to sway the move to drop CFB, as I do not know 
> how Operator Privacy will be implemented over the next couple years.
>
> But a "heads up" to one valuable use of CFB.
>
> Thank you
>
> Robert Moskowitz
>
> On 1/27/26 7:34 PM, Paul Kehrer via Cryptography-dev wrote:
>
> PyCA cryptography 46.0.4 has been released to PyPI. cryptography includes 
> both high level recipes and low level interfaces to common cryptographic 
> algorithms such as symmetric ciphers, asymmetric algorithms, message digests, 
> X.509, key derivation functions, and much more. We support Python 3.8+, and 
> PyPy3 3.11.
>
> Changelog (https://cryptography.io/en/latest/changelog/#v46-0-4)
> * Dropped support for win_arm64 wheels.
> * Updated Windows, macOS, and Linux wheels to be compiled with OpenSSL 3.5.5.
>
> -Paul Kehrer (reaperhulk)
>
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