Learn Cryptography

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Cryptography or cryptology (from Ancient Greek: κρυπτός, translit. kryptós "hidden, secret"; and γράφειν graphein, "to write", 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, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; 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, electrical engineering, communication science, and physics. Applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications.

Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the name Alice ("A") for the sender, Bob ("B") for the intended recipient, and Eve ("eavesdropper") for the adversary. Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread.

Content Includes

• Origin of Cryptography

• Modern Cryptography

• Cryptosystems

• Attacks On Cryptosystem

• Traditional Ciphers

• Modern Symmetric Key Encryption

• Block Cipher

• Feistel Block Cipher

• Data Encryption Standard

• Triple DES

• Advanced Encryption Standard

• Block Cipher Modes of Operation

• Public Key Encryption

• Data Integrity in Cryptography

• Cryptography Hash functions

• Message Authentication

• Cryptography Digital signatures

• Public Key Infrastructure

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