Structure of ancient Greek armies and military communication
Sparta and secrecy in non-Spartan sources
The scytale
Cryptography and steganography in Aeneas Tacticus' How to Survive Under Siege
Roman views towards the Spartan scytale
The development of the principle of the transposition cipher system of the scytale in ciphers from the Renaissance to the 21st century
Appendix 1. Terminology concerning cybersecurity and espionage
Appendix 2. Greco-Roman and Medieval sources on the Spartan scytale in alphabetic order per author
Appendix 3: Greco-Roman sources on cryptography and steganography
Appendix 4: Medieval, Renaissance, and Early Modern sources on cryptography and steganography referring to Greco-Roman sources.