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…
Slide 1 Week 2 - Friday Slide 2 What did we talk about last time? Substitution ciphers Vigenère ciphers One-time pad Slide 3 Slide 4 Slide 5 Michael Franzese…
Slide 1 Shanna R. Simpson-Singleton Professor Kenneth Shiskowski, Ph.D. Mathematics Department The History of Cryptology 1 SUMMERIANS OF MESOPOTAMIA An ancient civilization…
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…
Slide 1 Shanna R. Simpson-Singleton Professor Kenneth Shiskowski, Ph.D. Mathematics Department The History of Cryptology 1 SUMMERIANS OF MESOPOTAMIA An ancient civilization…
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…