Mechanising Cryptography

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Mechanising Cryptography Professor Richard Walton CB

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Mechanising Cryptography. Professor Richard Walton CB. Cryptography is concerned with the application of technology to the problem of encrypting and decrypting a message. The Mathematics is subordinate to the technology. 20 th Century Cryptography. Development of Crypt in the 1900s - PowerPoint PPT Presentation

Transcript of Mechanising Cryptography

Page 1: Mechanising Cryptography

Mechanising Cryptography

Professor Richard Walton CB

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Cryptography is concerned with the application of technology to the problem of encrypting and decrypting a message.

The Mathematics is subordinate to the technology

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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

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CRYPTOGRAPHYSecurity

Usability Cost

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Cryptanalysis 1918

Knowledge of language Frequency Analysis Key Re-use (Depth)

Skill Requirement:To solve crossword puzzles

in foreign languages

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Rotor Machines

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Rotors

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Commercial Enigma

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Enigma

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Enigma

Army

Navy

Navy – 4 wheel

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Early Machine Cryptography

Limitations of Security Design Balance Security against Cost Usability – Human Factors

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Electronics – 1960-1980

Shift Registers and Simple Logic Gates Linear Algebra Galois Theory Rich Mathematical structure Rigorous Analysis Expensive Components

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Large Scale Integration

Application Specific Integrated Circuits Complex Algorithms Tailored to purpose Standard Cryptographic Primitives Software and Firmware

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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

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Next Challenge

Quantum Computers destroycurrent Public Key algorithms

Find new algorithms to resist Quantum Computer attacks

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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 www.xat.nl/enigma-e/


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