The funny thing is AES128 may be harder to break than AES256.
https://www.schneier.com/blog/archives/2009/07/another_new_aes.html
It had been a decade, so it would be interesting if Bruce Schneier has the same opinion.
I just use the defaults.
Original Message From: dovecot@dovecot.org Sent: October 28, 2019 7:13 AM To: dovecot@dovecot.org Reply-to: 400thecat@gmx.ch Subject: changing cipher for imap clients
When my client connects, I see this in my log:
dovecot: imap-login: TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)
Whereas, when client connects to my postfix server, I see:
Anonymous TLS connection established from * TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
how can I tell dovecot to use AES256, instead of AES128 ?
is this set by ssl_cipher_list ? Here are my current values (defaults)
# doveconf ssl_cipher_list ssl_cipher_list = ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH
# dovecot --version 2.3.4.1
thanks,