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What not to write on your security clearance form (1988)
Date: 01 Apr 88 1620 PST From: Les Earnest <LES...@S...> Subject: The "previous account" referred to in RISKS-6.51 A friend named Bob and I read the book ``Secret and Urgent,'' by Fletcher Pratt [Blue Ribbon Books; Garden City, NY; 1942] which was an early popular account of codes and ciphers. Pratt showed how to use letter frequencies to break ciphers and reported that the most frequently occurring letters in typical English text are e-t-a-o-n-r-i, in that order.
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