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Real-world 'document' encryption

I've been reviewing histories of cryptography recently and here's an interesting thing about pre-computer encryption: it's almost entirely used for communications security. People encrypted messages, but they rarely encrypted documents.

I've finally found a few real-world cases: encrypted diaries. BBC actually did a short segment on them last summer. But I'm still looking - there must be other cases where someone needed to keep some long-term data secret from prying eyes.

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