This photo should not exist 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... Continue Reading →

Stream Cipher Reuse: A Graphic Example

Take a look at the following image. You should see two different 'messages' here. This particular mish-mash of messages reflects the failure of otherwise strong cryptography: the improper implementation of a one-time pad or a stream cipher. This same mistake let American cryptanalysts decode thousands of Soviet spy messages in the 1940s and -50s. The... Continue Reading →

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