Mathematical Foundation for Agrippa‘s Encryption Code (1938)

Excerpt from math book Item #D4. Mathematical basis of the encryption used to make the pre-encrypted copy of Gibson’s poem on Agrippa’s disk. (This is the work referred to by the programmer in the last paragraph of his letter of 28 March 1992).
Facsimile Images
Bibliographical Information

See also the programmer’s letter on the encryption code.