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Kata kriptografi berasal dari bahasa Yunani, “kryptós” yang berarti tersembunyi dan “gráphein” yang berarti tulisan. Kriptografi telah digunakan oleh Julius Caesar sejak zaman Romawi Kuno. Teknik ini dijuluki Caesar cipher untuk mengirim pesan secara rahasia, meskipun teknik yang digunakannya sangat tidak memadai untuk ukuran kini. Casanova menggunakan pengetahuan mengenai kriptografi untuk mengelabui Madame d’Urfe (ia mengatakan kepada Madame d’Urfe bahwa sesosok jin memberi tahu kunci rahasia Madame d’Urfe kepadanya, padahal ia berhasil memecahkan kunci rahasia berdasarkan pengetahuannya mengenai kriptografi), sehingga ia mampu mengontrol kehidupan Madame d’Urfe secara total. (Kromodimoeljo, 2010).



Kriptografi juga digunakan oleh tentara Sparta melalui alat pembuat pesan yang disebut Scytale. Scytale merupakan suatu alat yang memiliki pita panjang dari daun papyrus dan ditambah dengan sebatang silinder. Mula – mula pengirim menuliskan pesannya diatas pita papyrus yang digulung pada sebatang silinder, setelah itu pita dilepaskan dan dikirimkan. Batang silinder yang cukup tebal dapat dituliskan 6 huruf dan bisa memuat 3 huruf secara melingkar. (Ariyus, 2008).
     
 
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