information theory - Overhead Projector Cryptography - Puzzling Stack Exchange

Back in the day, if you wanted to show an image to a large audience, you would use an overhead projector. This would shine a light through a transparency, which is a clear sheet with a black drawing

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A mutation-based approach for the formal and automated analysis of security ceremonies - IOS Press

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A mutation-based approach for the formal and automated analysis of security ceremonies - IOS Press

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A mutation-based approach for the formal and automated analysis of security ceremonies - IOS Press