The history of cryptography
Welcome to the world of secret codes! Cryptography has a fascinating history that stretches from ancient clay tablets to modern quantum computers.
To help me tailor our journey through the history of cryptography, could you tell me a little about your background? Are you interested in the mathematical side, the historical stories, or how it applies to cybersecurity today?
I'm fascinated by the historical stories and codebreakers!
It is wonderful to have you on board! Since you love the human side of this story, we are going to focus on the clever scribes, ancient royalty, and brilliant wartime codebreakers who shaped our world.
Your path
Medieval and Renaissance Advancements
World War II and the Birth of Machine Cryptography
The Digital Age and Modern Cryptography
The Birth of Secret Writing
To understand where our story starts, we have to look at the word cryptography itself. It comes from the Greek words kryptos (hidden) and graphein (to write).
At its simplest, cryptography is the art of taking a readable message, which we call plaintext, and scrambling it into an unreadable mess, known as ciphertext. To turn it back into plaintext, you need a secret key or a specific method. Without that, the ciphertext just looks like complete gibberish to anyone who intercepts it.
But here is a fascinating twist: the earliest examples of modified writing weren't actually meant to keep secrets at all!
Around 1900 BC, an Egyptian scribe carved unusual, non-standard into the tomb of a nobleman named Khnumhotep II. The scribe didn't want to hide anything. Instead, he used these custom symbols to add a sense of mystery, prestige, and high dignity to the tomb, hoping to catch the eye of educated onlookers. It was more about showing off and playing a clever game than securing top-secret information.
For the first actual security code in history, we have to travel to Mesopotamia around 1500 BC. There, a crafty artisan used cryptography on a clay tablet to scramble a highly valuable . This wasn't for amusement; it was the ancient world's version of protecting commercial trade secrets from corporate spies!