Implementation of protection mechanisms against cyber attacks and abuses in blockchain information security management systems

The selection of security methods for the ISMS of blockchain systems has been researched and justified, considering their specifics and the nature of threats. The key selection factors include ensuring reliability, decentralization, confidentiality, and cyberattack resilience. Various approaches were examined, including consensus algorithms, cryptographic methods, smart contract security, and network protocols. Based on the analysis, the implementation of a monitoring and response method was deemed appropriate, specifically utilizing tools such as iptables, ipset, fail2ban, and dynamic blacklists of IP addresses. This mechanism effectively combines various tools for automation and dynamic updating of security levels. By employing iptables and ipset, the system efficiently filters network traffic, while fail2ban monitors suspicious patterns and blocks malicious IP addresses based on configurable rules. The inclusion of dynamic blacklists adds an extra layer of protection by continuously updating the database of known malicious IP addresses, allowing real-time security adjustments. Monitoring results demonstrate that the system's effectiveness can vary significantly depending on the number of blocked attacks, the cyberattacks that bypassed the system, and the false positive rate.