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/etc/ssh/sshd_configand for the SSH client it will be in/etc/ssh/ssh_config. You want to look for theCipherline in each, and for example have justCipher aes256-ctrspecified. Then restart SSH via/etc/init.d/sshd restartor via the equivalent systemd command.sshd_configif you really care about SSH security, otherwise it can be all security theater.cipherslist is just one setting out of many for having SSH properly implemented... Protocol, PermitRootLogin, AuthorizedKeysFile, PermitEmptyPasswords, IgnoreRhosts, PermitTunnel, and so on. You can rely on their default settings as implemented in your linux distribution, butIgnornance is bliss only up until you have a problem