In cryptography and security, a situation where something appears to be one thing but simultaneously functions as another hidden thing, creating duality that conceals true purpose.
From 'crypto-' (hidden) + 'double' (from Latin 'duplus' meaning twofold). A modern technical term emerging from computer security and cryptographic theory in the late 20th century.
Steganography (hiding messages in images) is a cryptodouble—the image looks like normal art, but it secretly carries hidden data; it's like the digital version of invisible ink that works in plain sight!
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