Hello,
You're probably looking at this page because you've found
"rijndael-cbc@lysator.liu.se" in your ssh log files, when looking
at failed login attempts. As an example, you may have found lines
like this:
no matching cipher found. Their offer: aes256-cbc,rijndael-cbc@lysator.liu.se,aes192-cbc,aes128-cbc,arcfour128,arcfour,3des-cbc,none [preauth]
It is not an email address, despite looking like one to you. Nor
is it a user/member of the Lysator Academic Computer Society. It
is instead an alias for the cipher better known as AES (Advanced
Encryption Standard), as implemented by one of our members before
it was named aes256-cbc by the IETF. It is named as customary for
such ciphersuites, i.e. a name and a domain connected by an @
sign, and was left in by many ssh protocol implementations after
this for backwards compatibility. It can be worth mentioning that
it has also been deprecated in OpenSSH since 2014 with the release
of OpenSSH 6.7.
In short, trying to pin any "hacking attempts" on us
over this would be barking up the wrong tree. You could probably
find a source IP somewhere else in your log files, but there's
probably not much use going after them either, to be
honest.
Best regards
The Lysator Academic Computer Society