BOTW Directory - Science > Math > Recreations > Competitions

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The Cipher Challenge - Provides more background about the author's projects. With information about the lectures and newsletter.
Code Book Cipher Challenge Solution Page - Information on how to crack the code book ciphers, related links, and press releases. With contact information.
Plus Magazine - Singh's "Code Book" Challenge Cracked - Provides articles from the top mathematicians and science writers on topics as diverse as art, medicine, cosmology and sport. With news and archives.