Mechanising Cryptography

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Information about Mechanising Cryptography

Published on January 12, 2008

Author: Marcell


Mechanising Cryptography:  Mechanising Cryptography Professor Richard Walton CB Slide2:  Cryptography is concerned with the application of technology to the problem of encrypting and decrypting a message. The Mathematics is subordinate to the technology 20th Century Cryptography:  20th Century Cryptography Development of Crypt in the 1900s Manual Methods Slow Laborious Error-Prone Need to mechanise Importance of technology for design Nature of technological constraints CRYPTOGRAPHY:  CRYPTOGRAPHY Cost Cost Cryptanalysis 1918:  Cryptanalysis 1918 Knowledge of language Frequency Analysis Key Re-use (Depth) Skill Requirement: To solve crossword puzzles in foreign languages Rotor Machines:  Rotor Machines Rotors:  Rotors Commercial Enigma:  Commercial Enigma Enigma:  Enigma Enigma:  Enigma Army Navy Navy – 4 wheel Early Machine Cryptography :  Early Machine Cryptography Limitations of Security Design Balance Security against Cost Usability – Human Factors Electronics – 1960-1980:  Electronics – 1960-1980 Shift Registers and Simple Logic Gates Linear Algebra Galois Theory Rich Mathematical structure Rigorous Analysis Expensive Components Large Scale Integration:  Large Scale Integration Application Specific Integrated Circuits Complex Algorithms Tailored to purpose Standard Cryptographic Primitives Software and Firmware Public Key Cryptography:  Public Key Cryptography Key Management Non-Secret Encryption Ellis, Cocks & Williamson Beyond 1970’s technology Widespread after 1985 Search for easier solutions Elliptic Curve Cryptography Next Challenge:  Next Challenge Quantum Computers destroy current Public Key algorithms Find new algorithms to resist Quantum Computer attacks Slide19:  Mechanising Cryptography Acknowledgement Illustrations concerning Enigma in this presentation have been taken from the user manual for Enigma – E by Paul Reuvers & Marc Simons. For details of Enigma-E, which is available for purchase from Bletchley Park Museum, see

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