Opinion
The "Active Defense Doctrine": The illusion of firewalls
Israeli companies are under unprecedented attack and therefore must lead the global transition from reactive defense to proactive defense.
The paradigm that dominated the world of information security over the past decade, building higher walls around organizational assets has finally collapsed. We are now in an era in which the asymmetry between attacker and defender has reached an absurd peak: the attacker needs only a single small breach, while the defender is required to demonstrate defensive perfection 100% of the time across every endpoint, cloud environment, and remote access point.
The only answer to this impossible equation no longer lies in improving static defense tools, but in adopting a doctrine of symbiotic warfare, an organic and inseparable integration of capabilities from the world of offensive cyber into the core of the organization’s defensive architecture. When we speak about offensive cyber in the service of defense, we are referring to a deep conceptual shift that includes adversary intelligence gathering, reverse engineering the attacker’s intentions, and disrupting their moves before they ever reach the organizational server.
The corporate network has become a dynamic and exposed battlefield. Accordingly, instead of passively waiting for alerts from monitoring systems, active defense makes use of advanced deception techniques, such as building a network architecture in which real information is concealed within layers of false information, decoy servers, and fictitious data. This way, the moment the attacker takes the first step inside the network, they expose their behavioral signature - their attack tools, methods of operation, and sometimes even the identity of the operator - without having touched a single real data point.
Alongside this, we must address the most significant disruptive factor to enter the area in recent years: artificial intelligence. The AI revolution is not only changing the worlds of service or development; it is also changing the cyber battlefield itself. We are already used to speaking with AI agents instead of human representatives in many service centers, and developers are using Copilot and LLM tools to write code and streamline development processes by tens of percent. The same revolution is also taking place on the offensive side, where AI-based attack tools can now generate dynamic payloads, adapt in real time to the target environment, write exploit code automatically, and even analyze vulnerabilities faster than before.
The implication for information security managers is dramatic: a vulnerability severity metric such as CVSS is no longer sufficient for assessing the true level of risk. The critical question is no longer only "how severe is vulnerability", but "to what extent can it actually be exploited using automation and AI tools?" A vulnerability that once required a high level of expertise and significant resources to exploit may, within hours, become an available and accessible attack capability even for attackers with moderate skills. This is a fundamental shift in the way cyber risks must be managed.
In a world where attackers also benefit from computing power, automation, and AI, organizations cannot afford to remain in a passive defensive posture. This is where the active defense doctrine comes into play. It represents the transition from defense based on incident response to defense based on initiative, prediction, and disruption. Active defense requires establishing an operation that conducts continuous attack simulations, examines the organization through the adversary’s eyes, and dynamically identifies potential attack paths before a real attacker discovers them.
This shift is not only technological, but also a first-order economic and managerial issue. In a world where a cyber incident can erase billions of dollars in market value within just a few hours, boards of directors can no longer settle for technical reports on "how many attacks were blocked over the past year." Investors and regulators are now looking for genuine resilience, the kind that reflects the organization’s ability to continue operating under attack and to manage the incident before it turns into a communications or legal crisis.
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Active defense turns the cyber department from a "cost center" that creates operational barriers into a strategic "value center" that protects reputation, business continuity, and customer trust.
Another critical layer in this doctrine is the handling of the supply chain. Today, many sophisticated attacks do not enter through the "front door" but through external suppliers, subcontractors, and business partners. The use of offensive tools enables an organization to conduct proactive threat hunting not only within the organization itself, but also across its surrounding digital ecosystem. Instead of relying on suppliers’ compliance and security statements, organizations can analyze the tactics, techniques, and procedures of attack groups and identify logical vulnerabilities in shared business processes. The ability to view the organization through the attacker’s eyes makes it possible to identify gaps that no standard vulnerability scanner or annual penetration test would be able to expose.
In the complex geopolitical reality of 2026, cyber has become a strategic weapon in struggles between states, attack groups, and non-state organizations. Israeli companies are under unprecedented attack and therefore must lead the global transition from reactive defense to proactive defense. This means investing in high-quality personnel who understand the adversary’s mindset, using AI-based automation tools to disrupt hostile infrastructures in real time, and adopting the managerial understanding that the best way to protect your home is to know the adversary’s tools and methods up close.
Alon Aharon is the CEO of Armory Defense.
