Support for RSA keys > 4096 bits

Nicholas Papadonis nick.papadonis.ml at gmail.com
Wed Nov 7 07:53:56 CET 2018


For those interested, link to the NIST document:

https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57pt1r4.pdf

On Wed, Nov 7, 2018 at 1:50 AM Nicholas Papadonis <
nick.papadonis.ml at gmail.com> wrote:

> I read in NIST 800-57 Part 1 Rev. 4 pg 53 that RSA keys length of 15360
> bits is equivalent to a 256 bit AES symmetric key.  I also read in other
> documentation that NIST recommends such key lengths to protect data beyond
> 2030.  As email may be retained for many years it would seem appropriate to
> secure such communications with a larger key.
>
> Does this data agree with security experts?  Is there a reason why GnuPG
> limits RSA key length to 4096 bits?
>
> Thank you,
> Nicholas
>
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