ALS on 'a possible application of the kind of thing I am working on at present. It answers the question "What is the most general kind of code or cipher possible", and ... enables one to construct a lot of particular and interesting codes. One of them is pretty well impossible to decode without the key and very quick to encode. I expect I could sell them to H.M. Government for quite a substantial sum, but am rather doubtful about the morality of such things.' Hardy is in Princeton for the term. Graduate College, Princeton. 14 Oct. . 2 sh.
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