Tag Archives: secrecy

This photo should not exist

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Once we get past the creep factor of Nazi army uniforms, we see a communications team sending a secret message. They are using the legendary Enigma machine to encrypt the message.

But why, why did that officer allow a photographer to record this highly sensitive activity?

A failure of operational security (OPSEC). Allies in Blechley Park would have sacrificed lives for this photo, or any photo showing the device in operation.

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 encryptedmessages, but they rarely encrypted documents.

I’ve finally found a few real-world cases: encrypted diaries. BBC 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.

Continue reading Real-world document encryption