The Future of Cybersecurity: Zero Trust Architecture and the Role of AI
- Security
- 31 May, 2024
Introduction: The walls have collapsed, hackers are already within us
Cybersecurity in the past was a ‘Castle’ and ‘Moat’ model. The method was to build a strong firewall between the company's internal network (castle) and the external Internet (outside the castle), and to unconditionally trust those who passed through the castle gate (those accessing the company's network).
However, with the popularization of cloud services, the normalization of working from home, and the introduction of numerous mobile devices, this strong wall has completely collapsed. Employees access the cloud at the cafe to handle confidential documents, and hackers easily steal the rights of internal employees with a sophisticated phishing email and easily pass through the firewall. In an age where the dichotomous thinking of “inside is safe and outside is dangerous” no longer applies, a powerful security paradigm that has emerged as an alternative is Zero Trust.
1. What is Zero Trust?
The core philosophy of Zero Trust can be summarized in just one sentence: "Never Trust, Always Verify."
By default, every connection attempt is considered a potential threat, regardless of whether the user is connected to the company's internal network or using the boss' laptop. It is an architecture that continuously and rigorously verifies the user's identity, device safety status, access location and time, etc. whenever an attempt is made to access specific data or applications.
Three Core Principles of Zero Trust
- Verify Explicitly of all connections: ID and password alone are not enough. Access is granted by comprehensively determining multi-factor authentication (MFA), device health status (vaccine update status, etc.), and user location.
- Use Least Privileged Access: Grant only the amount of permissions (Just-In-Time) necessary for the user to perform the task, and only for that period of time (Just-Enough-Access). This is to prevent lateral movement by minimizing the area that a hacker can access even if the account is hijacked.
- Assume Breach: Design defenses assuming “our system has already been breached.” By dividing the network into very small units (micro-segmentation), even if one server is hacked, it isolates the malware from spreading to other servers and encrypts all communications.
2. Evolution of the spear and shield: Next-generation cyber security using AI
In a zero trust environment, the amount of data and logs that need to be verified increases astronomically. It is impossible for humans to analyze them individually and detect abnormalities, and this is where Artificial Intelligence (AI) and Machine Learning (ML) come in as essential shields.
Using AI from a defender’s perspective
- Real-time threat detection and pattern analysis: AI analyzes millions of network traffic logs per second, immediately detecting subtle abnormal behavior patterns (Anomaly) such as “Assistant Manager Kim usually connects from Seoul at 9 a.m., but now at 3 a.m. he is downloading a large amount of data from an overseas IP” and blocks the account.
- Security Assessment Automation (SOAR): You can't wait for security personnel to come to work when a hacking attempt is detected. The AI system automates initial response, including immediately isolating compromised PCs from the network and sending notifications to administrators, based on predefined playbooks.
- Intelligent phishing and malware blocking: The AI model learns the characteristics of increasingly sophisticated deepfake-based phishing attacks or new ransomware that bypasses existing vaccines to preemptively block them.
AI from an attacker’s perspective (hackers’ weaponization of AI)
Paradoxically, AI is also becoming a powerful weapon for hackers. This is called the ‘double-edged sword of security’.
- Abuse generative AI (ChatGPT, etc.) to create large quantities of customized spear phishing emails with perfect grammar.
- Uses AI to analyze security system patterns and create polymorphic malware that transforms code in real time to bypass detection.
Conclusion: There is no perfect security, resilience is life
There's an old adage in the security world: "If you want complete security, unplug your computer and bury it in the ground." No matter how strong a zero trust architecture and cutting-edge AI defense system you build, you cannot reduce the probability of being hacked to '0%'.
Ultimately, the ultimate goal of cybersecurity after 2024 is to acknowledge the failure of defenses and cultivate 'Cyber Resilience'**, which refers to how quickly business damage can be minimized and restored to normal when a breach occurs. Establishing a thorough backup system, regular mock hacking training, and raising security awareness among executives and employees will be the most reliable shield against hackers' AI spears.
