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Revisiting Lester Hill

Revisiting Lester Hill. Chris Christensen Northern Kentucky University. Lester S. Hill (1891 - 1961). Lester Hill: Cryptographer. The American Mathematical Monthly. 1929 “Cryptography in an algebraic alphabet” 1931 “Concerning certain linear transformation apparatus of cryptography”.

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Revisiting Lester Hill

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  1. Revisiting Lester Hill Chris Christensen Northern Kentucky University

  2. Lester S. Hill (1891 - 1961)

  3. Lester Hill: Cryptographer

  4. The American Mathematical Monthly • 1929 “Cryptography in an algebraic alphabet” • 1931 “Concerning certain linear transformation apparatus of cryptography”

  5. A.A. Albert (1905 – 1972)

  6. David Kahn • David Kahn met with Hill’s widow after Hill’s death and collected papers of Hill’s that were “laying around the house.” • Those papers are now at the National Cryptologic Museum library.

  7. National Crypt0logic Museum

  8. Papers from the David Kahn Collection • The Checking of the Accuracy of Transmittal of Telegraphic Communications by Means of Operations in Finite Algebraic Fields. • A Modular Algebraic Cipher-Coding System of Great Flexibility. • A Modular Algebraic and Pronounceable Cipher-Code. (Only one page exists.) • Concerning Linear Transformations with Coefficients which are Matrices and Application in Cryptography. • A Mathematical Cipher. • Certain Finite Groups and Cryptography (Memorandum for Naval Communications). (This document is essentially the same as “Elementary Bases …”) • Elementary Bases for Algebraic Cryptography (Memorandum for Naval Communications), dated June 1956. • Some Elementary Apparatus of Algebraic Cryptography, dated June 1956. • Letter from Lester Hill to Lloyd B. Wilson (an AT&T engineer), dated November 21, 1925. • Memorandum for Naval Communications, dated 1955.

  9. Elementary bases for algebraic cryptography

  10. Field of 25 elements Addition Multiplication

  11. Keystreams Segmented table Encryption

  12. Hill encryption

  13. H. C. Bruton, RADM, USN, Director, Naval Communications, 27 December 1955

  14. Thanks Jenna Torres, NKU Honors Thesis

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