Project Gutenberg 2009-03-01 Public domain in the USA. 105 Simonetta, Cicco 1410 1480 Simonetta, Francesco Perret, P.-M. (Paul-Michel) 1861 1893 Perret, Paul-Michel Les règles de Cicco Simonetta pour le déchiffrement des écritures secrètes Produced by Laurent Vogel, Christine P. Travers and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by the Bibliothèque nationale de France (BnF/Gallica) at http://gallica.bnf.fr) "Les règles de Cicco Simonetta pour le déchiffrement des écritures secrètes" is a historical text attributed to Cicco Simonetta, a secretary and advisor to the dukes of Milan during the Sforza dynasty, written in the late 15th century. This document presents a collection of rules and guidelines on cryptography, focusing on the methods for decoding secret writings that were becoming more prevalent in Italy during this period. The work reflects the early developments in cryptographic practices, coinciding with a time when encoded communication was increasingly important in political and administrative contexts. The text outlines a series of thirteen rules aimed at helping readers decode messages, highlighting techniques based on the frequency of letters and specific word structures in both Latin and vernacular Italian. Simonetta employs an empirical approach, drawing on his personal experiences within the Milanese chancery to offer practical advice for identifying key letters and patterns within encrypted messages. His strategies emphasize the importance of recognizing vowels and common letter combinations, providing insight into the rudimentary techniques of cryptography of the time. Despite its foundational simplicity, Simonetta’s work serves as an important reference in the history of cryptography, illustrating the nascent understanding of secret writing methods in the late 15th century. (This is an automatically generated summary.) Reading ease score: 58.2 (10th to 12th grade). Somewhat difficult to read. fr Cryptography Z Text FR Sciences et Techniques Category: History - Early Modern (c. 1450-1750) Category: Engineering & Technology 62736 2025-07-11T13:17:11.105232 text/html 57997 2009-03-01T11:08:36 text/html 118290 2025-07-11T13:17:16.673226 application/epub+zip 116802 2025-07-11T13:17:14.308211 application/epub+zip 87456 2025-07-11T13:17:13.161236 application/epub+zip 322408 2025-07-11T13:17:18.279181 application/x-mobipocket-ebook 309528 2025-07-11T13:17:15.957251 application/x-mobipocket-ebook 262505 2022-09-13T07:42:08.920622 application/x-mobipocket-ebook 47865 2025-07-11T13:17:10.776246 text/plain; charset=us-ascii 47155 2009-03-01T11:08:34 text/plain; charset=us-ascii 20355 2025-07-11T13:17:18.401207 application/rdf+xml 24697 2025-07-11T13:17:13.655201 image/jpeg 4536 2025-07-11T13:17:13.408207 image/jpeg 18374 2009-03-01T11:08:36 application/octet-stream application/zip 20427 2009-03-01T11:08:36 application/octet-stream application/zip 117615 2025-07-11T13:17:11.111231 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog fr.wikipedia en.wikipedia