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No, Cryptography Is Not “Dual Use” the Same Way AI Is

L3 · BuilderOpinion & AnalysisLessWrong AI· 10/11/2026

Critical analysis of AI classification that informs builders working with both security and AI technologies.

AI Summary

Argues that cryptography is fundamentally defensive unlike AI, challenging the comparison of their dual-use nature.

Excerpt

Actor and functional application matter Originally published at AGI SurveilLance. Mainly, cryptography does one critical thing—encrypts data. It is considered “dual use” as a technology because one can employ encryption whether as a private citizen, a soldier, or a criminal. But, like a wall, it’s an inherently defensive tool by its nature. One cannot really attack with cryptography.[1] The term “cryptographic attack” refers to an attack on the cryptography of a target.[2] During the Crypto Wars

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