Medieval Encrypted Letter Decoded

HomeBlog Medieval Encrypted Letter Decoded Sent by a Spanish diplomat. Apparently people have been working on it since it was rediscovered in 1860. Tags: history of cryptography Posted on April 27, 2026 at 7:04 AM • 4 Comments Comments Subscribe to comments on this entry Leave a comment Blog moderation policy Login Name Email URL: Fill in the blank: the name of this blog is Schneier on ___________ (required): Comments: Allowed HTML <a href="URL"> • <em> <cite> <i> • <strong> <b> • <sub> <sup> • <ul> <ol> <li> • <blockquote> <pre> Markdown Extra syntax via https://michelf.ca/projects/php-markdown/extra/ ← Friday Squid Blogging: How Squid Survived Extinction Events Sidebar photo of Bruce Schneier by Joe MacInnis. Powered by WordPress Hosted by Pressable