ALT Graphic of the start of a timeline with the text 'Encryption through the ages. 7th century BC: Sytale. The Greeks wrapped secret messages written on parchment around a wooden rod.' and a graphic of a wooden rod with a message wrapped around it.

ALT Graphic of a timeline with the text '1st century BC: Caesar Cipher. Julius Caesar exchanged letters in texts for the next third letter of the alphabet.' and '15th century AD: Cipher Disk. Invented by mathematician Leon Alberti, the cipher disk consisted of sliding rings with letters.' Graphic of the Caesar Cipher shows an example of the letter E becoming B, F becoming C, and G becoming D. A cipher disk is depicted as rings of letters with a view finder.

ALT Graphic of a timeline with the text '19th Century AD: Morse Code. A system of representation of letters and numbers through signals emitted intermittently.' and '20th century AD: Enigma. Rotary encryption mechanism machine that allowed decryption and encryption of messages.' Morse codes dots and dashes spell out E-N-C-R-Y-P-T and a graphic depicting an enigma machine includes rotaries, 2 keyboards, and plugs on the side of the box.

ALT Graphic of a timeline with the text '20th century AD: Quantum Cryptography. Based on the principles of physics and quantum mechanics, not mathematics. Requires the use of photons.' and 'Learn more about the state of encryption today at internetsociety.org/encryption/'