1. SSH

について、ここに記述してください。

https://tech.repro.io/entry/2023/11/30/181742

https://docs.acquia.com/article/updated-ciphers-require-changes-ssh-clients-and-automated-services

To ensure you are using an SSH/SFTP/SCP client with secure ciphers, confirm that your software includes at least one of the following:

Ciphers: aes128-ctr, aes192-ctr, aes256-ctrMACs: hmac-sha1, umac-64@openssh.com, hmac-ripemd160, hmac-sha1-96, hmac-sha2-256, hmac-sha2-512, hmac-sha2-512-96

ssh -vv servername

1.1. mozilla

https://wiki.mozilla.org/Security/Guidelines/OpenSSH

https://wiki.mozilla.org/Security/Guidelines/OpenSSH#Intermediate_.28connects_to_older_servers.29

1.1.1. Key generation

Large key sizes are used as SSH keys are not renewed very often (see also Security/Key_Management).

• Note:
  • DSA and RSA 1024 bit (or lower) keys are considered weak and should be replaced as soon as possible.

Ciphers and algorithms choice