How a 1674 Encrypted Letter Traveled 10,000 km

#cryptology, #cryptography, #cryptanalysis
In this video, we discover the story of a 1674 Dutch East India Company encrypted letter. Carried by a secretary of the VOC over 10,000 km and sent from Ceylon, it contained vital military and trade plans. We were able to decrypt its content easily and wrote a paper and an article about that. In this video, I present the story behind the letter, the ciphertext and cipher itself and of course its decryption.
Literature mentioned in the video:
[1] Dinnissen , J., & Kopal, N. Island Ramanacoil a Bridge too Far. A Dutch Ciphertext from 1674. In International Conference on Historical Cryptology (pp. 48 57). 2021.
[2] Kopal , N. & Dinnissen, J. Konzerngeheimnisse - Entschlüsselt: Ein Brief der Niederländischen Ostindien- Kompanie . c't 16/2022 p. 130
[3] Record 1564 in the DECODE database: “The Ramanacoil Transcript”.de-crypt.org/decrypt-web/Reco...
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