Operational Use and Cryptanalysis of the Kryha Cipher Machine

摘要

The Kryha machine was introduced in 1924 and continued to be marketed into the 1950s. The cryptologic literature surveyed for this article includes descriptions of various models of the machine and methods of attacking it, but relatively little has been written about its operational use. This article reviews both published and archival material, and provides some examples of actual use and cryptanalysis from the period immediately before and during the Second World War.