quantum computing and symmetric algotithms

[Jakob Bohm]

On 30/04/2026 16:47, aton6074 at Safe-mail.net wrote:
> It would be useful in discussions on quantum computing and cryptography not to miss that vulnerability (if and to the extent it exists) only pertains to the asymmetric algorithms. As far as we know, no modern symmetric block  cipher is affected.
>
I was under the impression that for any generic symmetric cipher, Grover's
algorithm would halve the strength in bit, for example a 128 bit key would
be as weak against Quantum computers as a current 64 bit key
against normal computers.

Enjoy

Jakob
-- 
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
This public discussion message is non-binding and may contain errors.
WiseMo - Remote Service Management for PCs, Phones and Embedded