| http://www.w3.org/ns/prov#value | - oncealment techniques -- Null cipher -- Cardano grille -- Word grille -- Space code -- Playing card code -- Dot cipher -- Line cipher -- Zigzag cipher -- Invisible inks.@en ; schema:description Presents a guide to codemaking, codebreaking, and their role in history, describing different types of codes and ciphers, discussing codebreaking and concealment techniques, and including brief stories ab
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