L01-Introduction - “Three may keep a secret, if two of...

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1 Introduction to Cryptography Introduction to Cryptography “Three may keep a secret, if two of them are dead” - Benjamin Franklin (1706 - 1790)
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2 Cryptography Cryptography Crypt = secret Graph = writing Cryptology is the science / art / study of both cryptography and cryptanalysis Cryptanalysis is the science / art of breaking cryptographic codes Cryptography is the science / art of transforming intelligible text into unintelligible text
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3 Why do we need Cryptography ? Why do we need Cryptography ? For – Data Confidentiality – Data Integrity – Entity Authentication – Data Origin Authentication –Documen t S ign ing
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4 Steganography Steganography – Stega = hidden –G raph = w r i t ing • Steganography is the science / art of hiding information inside objects •E x a m p l
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This note was uploaded on 09/15/2010 for the course CSE IT325 taught by Professor Maniklaldas during the Fall '09 term at Punjab Engineering College.

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L01-Introduction - “Three may keep a secret, if two of...

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