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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