Protocol Foundations 001: Cryptography [electronic resource].

Ethereum Foundation 2023

Open access content

Throughout history, humans have used cryptography to protect sensitive messages from eavesdropping. Famously, to avoid trusting messengers, Julius Caesar would encode messages he sent to generals at war. He specifically replaced each letter in his original message by one that was a fixed distance away from it in the alphabet. For example, the word attack could be modified to dwwdfn by using a distance of 3: d is three letters past a, w is three from t, and so on. This technique is called a Caesar cipher. As long as Caesar communicated the offset to a general in advance, he could send seemingly illegible messages to them which they could then decipher…
https://www.librarystack.org/protocol-foundations-001-cryptography/?ref=unknown

Algorithms
Electronic surveillance
Mathematics

Text

Mario Havel
Tim Beiko