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CIS 115
Cryptography
Cryptography
Message to the Class
TSTEPHAAXLISLAESCEMQIYQ
Scytale
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Message to the Class
TSTEPHAAXLISLAESCEMQIYQ
T H I S I
S A S C Y
T A L E Q
E X A M
P L E Q
Early Ciphers
Tabula Recta
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Image Source: Wikipedia
Enigma Machine
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Enigma Machine Rotors
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Enigma Machine Rotors
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Enigma Machine Ratchet
Image Source: Wikipedia
Image Source: Wikipedia
Enigma Machine Plugboard
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Enigma Key
Enigma Operation
Enigma Stengths
Enigma Weaknesses
Marian Rejewski
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Cracking Enigma
Bombe
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Impact
“My own conclusion is that it shortened the war by not less than two years and probably by four years … we wouldn't in fact have been able to do the Normandy Landings, even if we had left the Mediterranean aside, until at the earliest 1946, probably a bit later.”
-Sir Harry Hinsley
British Intelligence Historian
Claude Shannon
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Symmetric Key Encryption
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Public Key Encryption
Image Source: Askamathematician.com
RSA Encryption
RSA Example
RSA Example
RSA Keys
Assignments
Blog 6: Computing Science & Mathematics
As we embark on reading the last textbook, it should be very obvious by now that mathematics is a core aspect of Computing Science. In fact, most Computing Science departments and disciplines have a direct foundation in the study of mathematics. Here’s a good quote summing it up from Harold Abelson: “Mathematics provides a framework for dealing precisely with notions of "what is". Computation provides a framework for dealing precisely with notions of "how to".” For this article, write about how Computing Science and Mathematics are related. (Food for thought - Read up on Theoretical Computer Science and Applied Mathematics.) Things you can talk about:
RSA Activity