Cryptography (or cryptology; from Greek κρυπτός kryptós, „hidden, secret”; and γράφειν graphein, „writing”, or -λογία -logia, „study”, respectively) is the practice and study of techniques for secure communication in the presence of third parties (called adversaries). More generally, it is about constructing and analyzing protocols that block adversaries; various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, and electrical engineering. Applications of cryptography include ATM cards, computer passwords, and electronic commerce.
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The same libraries that secure iOS and OS X are available to third‑party developers to help them build advanced security features.
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The utility is designed to help you secure sensitive information, such as notes or other pieces of writing and share them with others.