Cryptography (or cryptology; from Greek κρυπτός, kryptos, "hidden, secret"; and γράφειν, gráphin, "writing", or -λογία, -logia, , "study", respectively) is the practice and study of hiding information. Modern cryptography intersects the disciplines of mathematics, computer science, and electrical engineering. Applications of cryptography include ATM cards, computer passwords, and electronic commerce.
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