1. The penetration testing execution standard (2014). http://www.pentest-standard.org/index.php/Main_Page
2. Reconnaissance – tactic ta0043 (2020). https://attack.mitre.org/tactics/TA0043/
3. Use alternate authentication material (2022). https://attack.mitre.org/techniques/T1550/
4. CIS (2023). https://www.cisecurity.org/controls
5. Fail2ban: ban hosts that cause multiple authentication errors (2023). https://github.com/fail2ban/fail2ban