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De Furtivis Literarum Notis - Wikipedia

1563 book on cryptography

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] a substitution cipher improving on the work of Al-Qalqashandi,^[4] and one of the earliest known music substitution ciphers.

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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