--- title: Schneier on Security | daily.dev description: A medieval encrypted letter sent by a Spanish diplomat has been fully decoded. The letter was rediscovered in 1860 and researchers have been working to... canonical: https://daily.dev/posts/schneier-on-security-qftcmqt6q twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Schneier on Security | daily.dev og:description: A medieval encrypted letter sent by a Spanish diplomat has been fully decoded. The letter was rediscovered in 1860 and researchers have been working to... og:url: https://daily.dev/posts/schneier-on-security-qftcmqt6q og:image: https://api.daily.dev/og/posts/qFtCMQT6q.png og:image:alt: Schneier on Security og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Schneier on Security **[Schneier on Security](https://daily.dev/sources/schneier)** · 1 min read · 0 upvotes · 0 comments ## Summary A medieval encrypted letter sent by a Spanish diplomat has been fully decoded. The letter was rediscovered in 1860 and researchers have been working to decipher it ever since, with the decoding now complete. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Schneier on Security](https://daily.dev/posts/schneier-on-security-btivfoc3r) · Schneier on Security · 0 upvotes · 0 comments - [Schneier on Security](https://daily.dev/posts/schneier-on-security-klbvepj8z) · Schneier on Security · 0 upvotes · 0 comments - [Schneier on Security](https://daily.dev/posts/schneier-on-security-pjjkytfph) · Schneier on Security · 0 upvotes · 0 comments - [Schneier on Security](https://daily.dev/posts/schneier-on-security-il0ktatyb) · Schneier on Security · 0 upvotes · 0 comments - [Schneier on Security](https://daily.dev/posts/schneier-on-security-6isljxxwl) · Schneier on Security · 0 upvotes · 0 comments --- Tags: [#cryptography](https://daily.dev/tags/cryptography) [View this post on daily.dev](https://daily.dev/posts/schneier-on-security-qftcmqt6q) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Schneier on Security","url":"https://daily.dev/posts/schneier-on-security-qftcmqt6q","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/schneier-on-security-qftcmqt6q"},"datePublished":"2026-04-27T11:08:45.465Z","dateModified":"2026-04-27T11:08:56.463Z","description":"A medieval encrypted letter sent by a Spanish diplomat has been fully decoded. The letter was rediscovered in 1860 and researchers have been working to...","image":"https://media.daily.dev/image/upload/s--OHB84bZF--/f_auto/v1722860399/public/Placeholder%2010","thumbnailUrl":"https://media.daily.dev/image/upload/s--OHB84bZF--/f_auto/v1722860399/public/Placeholder%2010","isAccessibleForFree":true,"articleSection":"Schneier on Security","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Schneier on Security","logo":"https://media.daily.dev/image/upload/s--0aZDA7eZ--/f_auto/v1758461069/logos/schneier","url":"https://daily.dev/sources/schneier"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/schneier-on-security-qftcmqt6q","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"cryptography","timeRequired":"PT1M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Schneier on Security","item":"https://daily.dev/sources/schneier"},{"@type":"ListItem","position":3,"name":"Schneier on Security"}]} ```