Exploring the Offense-Defense Balance of Biology

As advancements in synthetic biology and related enabling technologies lower barriers to both pathogen engineering and pharmaceutical development, it is important to understand how these advances shift the balance between attackers and defenders. This high-level qualitative assessment identifies four asymmetries likely to favor attackers (kinetic considerations, financial burden, threat surface, and consequences of failure) and one likely to favor defenders (access to knowledge and materials).

This paper does not include the quantitative analysis necessary to fully assess the offense-defense balance in biology but does lay essential groundwork for future research. The identification of four out of five asymmetries favoring attackers suggests that biology currently confers a distinct advantage to attackers. Although the current asymmetry in access to knowledge and materials favors defenders, this advantage may be difficult to maintain as biotechnology becomes cheaper, more accessible, and decentralized.

To mitigate rising risks, defenders can pursue strategic interventions that tilt the balance in their favor. These include streamlining regulatory pathways for pharmaceutical countermeasures, investing in pathogen-agnostic defenses, and applying the principle of differential technology development—intentionally accelerating innovations that disproportionately enhance defensive resilience. By understanding and addressing these asymmetries, policymakers can better navigate both safeguarding public health and sustaining scientific progress.