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The Mlecchita Vikalpa cipher from Vatsyayana's Kama Sutra (~400 CE) — a paired-letter substitution taught to lovers as one of the 64 arts.
The Mlecchita Vikalpa cipher from Vatsyayana's Kama Sutra (~400 CE) — a paired-letter substitution taught to lovers as one of the 64 arts.