[Cryptography-dev] AES-CTR with 256 bit keys

[Arshad Khan]

Thanks Alex for the quick reply.

So in my case it can be said that I am using AES-256-CTR cipher? Because I
was calling it AES-128-CTR and people were asking me why I am using a
smaller key.

On Fri, Feb 3, 2023 at 9:09 AM Alex Gaynor <alex.gaynor at gmail.com> wrote:

> This is not correct, block size and key size are not the same thing
> for symmetric encryption algorithms.
>
> AES's block size is always 128-bit, it's not something cryptography
> chooses to use, it's the definition of the algorithm.
>
> Alex
>
> On Thu, Feb 2, 2023 at 8:02 PM Arshad Khan <khan.m.arshad at gmail.com>
> wrote:
> >
> > Hello
> >
> > I have a question regarding AES in python cryptography which uses a
> block size of 128 bits. Currently I am using 256 bit keys with AES in CTR
> mode. However, internally the python cryptography uses a block size of 128.
> My understanding is that block size and key size are the same for symmetric
> encryption. How does a 256 bits key work in this case? Appreciate if
> someone could provide some explanation about this and clear my confusion.
> >
> > Thanks
> > Arshad
> > _______________________________________________
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> > Cryptography-dev at python.org
> > https://mail.python.org/mailman/listinfo/cryptography-dev
>
>
>
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