Part 14/17:
**Security through secrecy alone is fragile.** Every design carries human fingerprints—patterns, habits, shortcuts—which can be exploited if not continuously scrutinized. The breakthrough came not just from mathematical sophistication but also from understanding human behavior and procedural vulnerabilities.
Similarly, collaboration and transparency—the Polish sharing of their breakthroughs, the interdisciplinary teamwork at Bletchley—are vital to progress. Isolated proprietary systems and guarded secrets invite complacency and overconfidence, leaving systems vulnerable.