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3 Answers

Post-WW2, the allies sold enigma machines to developing countries, without mentioning they had broken the code.


Note: some people speculate the purchasing countries knew this and accepted the risk (

The British kept radar secret during WW2, and attributed pilots' ability to shoot down planes in the dark to vitamin A.


  • Nuclear weapons
  • Dangerous biotechnology
    • Cultures of dangerous pathogens (seems a bit weird to call this a secret, but it has a lot of attributes of secrets)
    • Tools and knowledge to build better gene-editing technology
    • Concrete applications of existing technology that could be highly dangerous
  • Chemical weapons
  • Drone manufacturing technology?
  • Methods of terrorism
    • Potential critical weakpoints in infrastructure
    • Other terrorism ideas