De Furtivis Literarum Notis

De Furtivis Literarum Notis (On the Secret Symbols of Letters) is a 1563 book on cryptography written by Giambattista della Porta.[1]

The book includes three sets of cypher discs for coding and decoding messages[2][3] and a substitution cipher improving on the work of Al-Qalqashandi.[4]

References
  1. "Keeping secrets in sixteenth-century Istanbul". OUPblog. 22 August 2017. Retrieved 23 September 2020.
  2. "On Secret Writing". University of Oklahoma. 23 June 2015. Retrieved 23 September 2020.
  3. ""The Author And His Work" Giambattista della Porta (JOHN BAPTIST PORTA)". University of Massachusetts Boston. Retrieved 23 September 2020.
  4. "Giovanni della Porta, el sabio renacentista que encriptaba mensajes dentro de huevos para eludir el control de la Inquisición". La Brújula Verde (in Spanish). 1 March 2019. Retrieved 23 September 2020.
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