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Chapter 3 Traditional Symmetric-Key Ciphers 3.1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 3 Objectives ❏ To…

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Substitution Techniques 10/18/2010 K.Marimuthu,SCSE Network Security 1 Classical Ciphers Plaintext is viewed as a sequence of elements (e.g., bits or characters) Substitution…

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Slide 1 Shanna R. Simpson-Singleton Professor Kenneth Shiskowski, Ph.D. Mathematics Department The History of Cryptology 1 SUMMERIANS OF MESOPOTAMIA An ancient civilization…

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CS121 CS363 Week 3 - Friday Last time What did we talk about last time? Modular arithmetic Shift ciphers Transposition ciphers Substitution ciphers Vigenère ciphers One-time…

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Slide 1 Shanna R. Simpson-Singleton Professor Kenneth Shiskowski, Ph.D. Mathematics Department The History of Cryptology 1 SUMMERIANS OF MESOPOTAMIA An ancient civilization…

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Stream Cipher Stream Cipher A stream cipher breaks the message M into successive characters or bits m1, m2, ..., and enciphers each mi with the ith element ki of a key stream…