{"id":623758,"date":"2026-01-18T22:10:16","date_gmt":"2026-01-18T21:10:16","guid":{"rendered":"https:\/\/cronologia-universale.it\/february-14-1943\/"},"modified":"2026-01-18T22:10:16","modified_gmt":"2026-01-18T21:10:16","slug":"september-1940","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/september-1940\/","title":{"rendered":"September 1940"},"content":{"rendered":"<p>Frank Rowlett delivers the first two decrypted Japanese Purple messages to William Friedman. The Americans crack the Japanese Purple diplomatic code. This reopens access to information flow among the highest levels of Japanese diplomacy.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Frank Rowlett delivers the first two decrypted Japanese Purple messages to William Friedman. The Americans&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[40],"tags":[],"class_list":["post-623758","post","type-post","status-publish","format-standard","hentry","category-mt-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>September 1940 - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/september-1940\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"September 1940 - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"Frank Rowlett delivers the first two decrypted Japanese Purple messages to William Friedman. The Americans...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cronologia-universale.it\/en\/september-1940\/\" \/>\n<meta property=\"og:site_name\" content=\"Cronologia Universale\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-18T21:10:16+00:00\" \/>\n<meta name=\"author\" content=\"Rick\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Rick\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cronologia-universale.it\/en\/september-1940\/\",\"url\":\"https:\/\/cronologia-universale.it\/en\/september-1940\/\",\"name\":\"September 1940 - Cronologia Universale\",\"isPartOf\":{\"@id\":\"https:\/\/cronologia-universale.it\/#website\"},\"datePublished\":\"2026-01-18T21:10:16+00:00\",\"author\":{\"@id\":\"https:\/\/cronologia-universale.it\/#\/schema\/person\/f510f53010edc7a70b16caecf1c4af03\"},\"breadcrumb\":{\"@id\":\"https:\/\/cronologia-universale.it\/en\/september-1940\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cronologia-universale.it\/en\/september-1940\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cronologia-universale.it\/en\/september-1940\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cronologia-universale.it\/en\/universal-cronology\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"September 1940\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/cronologia-universale.it\/#website\",\"url\":\"https:\/\/cronologia-universale.it\/\",\"name\":\"Cronologia Universale\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/cronologia-universale.it\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/cronologia-universale.it\/#\/schema\/person\/f510f53010edc7a70b16caecf1c4af03\",\"name\":\"Rick\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/cronologia-universale.it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/7f707c665808696c8fa12345661bf0ef3aa60982ce3781ec6cc5b16b7b828ba8?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/7f707c665808696c8fa12345661bf0ef3aa60982ce3781ec6cc5b16b7b828ba8?s=96&d=mm&r=g\",\"caption\":\"Rick\"},\"sameAs\":[\"http:\/\/cronologia-universale.it\"],\"url\":\"https:\/\/cronologia-universale.it\/en\/author\/rick\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"September 1940 - Cronologia Universale","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/cronologia-universale.it\/en\/september-1940\/","og_locale":"en_US","og_type":"article","og_title":"September 1940 - Cronologia Universale","og_description":"Frank Rowlett delivers the first two decrypted Japanese Purple messages to William Friedman. The Americans...","og_url":"https:\/\/cronologia-universale.it\/en\/september-1940\/","og_site_name":"Cronologia Universale","article_published_time":"2026-01-18T21:10:16+00:00","author":"Rick","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Rick"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/cronologia-universale.it\/en\/september-1940\/","url":"https:\/\/cronologia-universale.it\/en\/september-1940\/","name":"September 1940 - Cronologia Universale","isPartOf":{"@id":"https:\/\/cronologia-universale.it\/#website"},"datePublished":"2026-01-18T21:10:16+00:00","author":{"@id":"https:\/\/cronologia-universale.it\/#\/schema\/person\/f510f53010edc7a70b16caecf1c4af03"},"breadcrumb":{"@id":"https:\/\/cronologia-universale.it\/en\/september-1940\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/cronologia-universale.it\/en\/september-1940\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/cronologia-universale.it\/en\/september-1940\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/cronologia-universale.it\/en\/universal-cronology\/"},{"@type":"ListItem","position":2,"name":"September 1940"}]},{"@type":"WebSite","@id":"https:\/\/cronologia-universale.it\/#website","url":"https:\/\/cronologia-universale.it\/","name":"Cronologia Universale","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/cronologia-universale.it\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/cronologia-universale.it\/#\/schema\/person\/f510f53010edc7a70b16caecf1c4af03","name":"Rick","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/cronologia-universale.it\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/7f707c665808696c8fa12345661bf0ef3aa60982ce3781ec6cc5b16b7b828ba8?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/7f707c665808696c8fa12345661bf0ef3aa60982ce3781ec6cc5b16b7b828ba8?s=96&d=mm&r=g","caption":"Rick"},"sameAs":["http:\/\/cronologia-universale.it"],"url":"https:\/\/cronologia-universale.it\/en\/author\/rick\/"}]}},"_links":{"self":[{"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/posts\/623758","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/comments?post=623758"}],"version-history":[{"count":2,"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/posts\/623758\/revisions"}],"predecessor-version":[{"id":688889,"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/posts\/623758\/revisions\/688889"}],"wp:attachment":[{"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/media?parent=623758"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/categories?post=623758"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cronologia-universale.it\/en\/wp-json\/wp\/v2\/tags?post=623758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}