Talk:Hollow Nickel Case

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This article is written in American English, which has its own spelling conventions (color, defense, traveled) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus.

A more detailed description of the Hollow Nickel Case, including a "second act" between the discovery of the coin and the trial as well as a detailed description of the method required to decrypt the code (involving a substitution and two transpositions) is contained in "Codebreakers" by David Kahn (published about 1950) and available in some libraries. — Preceding unsigned comment added by Lucky Vassall (talk • contribs) 18:45, 16 June 2019 (UTC)[reply]