Does this already look unreadable to you?
#Ciphertext is nothing else than unreadable data. To decipher it, you need the #key. 🔑
Interestingly enough, already Ancient Greeks used ciphers.
Learn how they did it and what has changed since: https://tuta.com/blog/what-is-ciphertext
@Tutanota nope! That is not unreadable 🤣 It is Greek that any Greek can read and it is not cyphered! Just it doesn't make sense as we see only a small portion of the text but still some words are readable.
We get what you want to say though 😉 and the scytale (σκυταλη) is the perfect example to explain simply encryption and decryption of a message.
Fedor
Tuta
River Fox 
XLEΞ