seal of Dickinson College —
Photo Credit: By Source (WP:NFCC#4), Fair use, https://en.wikipedia.org/w/index.php?curid=47654537

Graham Memorial at UNC Chapel Hill — Adjacent to Franklin Street and houses the Office for Undergraduate Research and the Honors Study Abroad program
Photo Credit: By Caroline Culler - Public Domain, https://commons.wikimedia.org/w/index.php?curid=6666172

seal of the University of North Carolina Chapel Hill —
Photo Credit: By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=28199013

Arthur Scherbius, inventor of the Enigma cipher —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=73550136

Military Enigma machine, model "Enigma I" — Used during the late 1930s and during the war; displayed at Museo scienza e tecnologia Milano, Italy
Photo Credit: By Alessandro Nassiri - Museo della Scienza e della Tecnologia "Leonardo da Vinci", CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=47910919

Leon Battista Alberti —
Photo Credit: Di G. Benaglia - Pubblico dominio, https://commons.wikimedia.org/w/index.php?curid=15884503

The Alberti Cipher disk —
Photo Credit: By Augusto Buonafalce - De componendis cifris, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3733873

Anti-pope Clement VII — Modern portrait by Calixte Serrur
Photo Credit: By Henri Auguste César Serrur - Les papes en Avignon, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=17864496

Isḥāq al-Kindī (801-873 CE) —
Photo Credit:

First page of On Deciphering Cryptographic Messages — The first page of al-Kindi's manuscript On Deciphering Cryptographic Messages, containing the oldest known description of cryptanalysis by frequency analysis.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=34672454

statue of Al-Khalil ibn Ahmad al-Farahidi in Basra —
Photo Credit: By احمد محمود خضير - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=27778602