2. tools
  3. ssh-keygen

    SSH Keygen

    Generate

    ssh-keygen -C "" -t rsa -b BITS -f OUTPUT_FILE_KEY
    • -C "" option permit to doesn't have a label.

    Note: This will also make OUTPUT_FILE_KEY.pub for public key.

    Change password

    ssh-keygen -f KEY_FILE -p

    ssh-keygen -lf /etc/ssh/ssh_host_rsa_key

    Note: Use -E md5 to print in specific format, by default it should be sha256

    For old systems which does not have -E option

    awk '{print $2}' ssh_host_rsa_key.pub | base64 -d | sha256sum -b | awk '{print $1}' | xxd -r -p | base64

    List available ciphers

    sshd -T | grep ciphers