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Against the average user, anything works; there's no need for complex security software. Against the skilled attacker, on the other hand, nothing works.

— Bruce Schneier

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More quotes by Bruce Schneier

Only amateurs attack machines; professionals target people.

It is poor civic hygiene to install technologies that could someday facilitate a police state.

Secrets and Lies (2000)

It's certainly easier to implement bad security and make it illegal for anyone to notice than it is to implement good security.

Anyone, from the most clueless amateur to the best cryptographer, can create an algorithm that he himself can't break.

Digital files cannot be made uncopyable, any more than water can be made not wet.

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Attribution

Quote text and notes from Wikiquote: Bruce Schneier (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.