A message written in secret code or cipher that is intentionally disguised so that only someone with the key can read it.
From Greek 'kryptos' (hidden) and 'gramma' (letter or writing), this term for coded messages has been used since the 17th century, gaining prominence during wartime and espionage activities.
The famous Zodiac Killer cryptograms still baffle cryptologists today—one remained unsolved for 51 years until 2020, proving that some hidden messages can genuinely defend their secrets through mathematical complexity.
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