Renaissance Ciphers: Encryption and Eggshells - Queens' Old Library
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[One of two pages shown - the cipher wheel]

Author: Giambattista della Porta 
Title: De occultis literarum
  [On the concealment of letters]  (Montbeliard, 1593)
Shelfmark: S.3.26  (catalogue record)

[One of two pages shown - the cipher wheel]

Author: Giambattista della Porta
Title: De occultis literarum [On the concealment of letters] (Montbeliard, 1593)
Shelfmark: S.3.26 (catalogue record)

16th centuryS.3.26cipherswoodcuts