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The paper is available at <a href="https://www.tandfonline.com/doi/full/10.1080/01611194.2025.2457084" rel="nofollow">https://www.tandfonline.com/doi/full/10.1080/01611194.2025.2...</a> from Cryptologia v50, 2026.<p>A PDF of Bellovin's paper (marked "draft") is available from the author at <a href="https://www.cs.columbia.edu/~smb/papers/codebooks.pdf" rel="nofollow">https://www.cs.columbia.edu/~smb/papers/codebooks.pdf</a> .<p>A "preliminary version" of the same paper is available at <a href="https://www.cs.columbia.edu/~CS4HS/talks/codebooks.pdf" rel="nofollow">https://www.cs.columbia.edu/~CS4HS/talks/codebooks.pdf</a> .<p>The "International Police Telegraph code" is available at <a href="https://discovery.nationalarchives.gov.uk/details/r/C210621" rel="nofollow">https://discovery.nationalarchives.gov.uk/details/r/C210621</a> ; registration required.
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