2026
Caesar Cipher
A rotating disc that teaches the Caesar cipher while you use it.
- JavaScript
- Privacidad
- Todo en el navegador
- Dependencias
- Ninguna
My role
Sole developer
What it is
The Caesar cipher shifts every letter a fixed number of positions through the alphabet. It is the oldest known substitution cipher and protects nothing today, but it is the doorway to understanding what encryption means.
Why I built it
Because explaining an algorithm in words is far harder than letting someone drag the shift and watch the disc turn. The centrepiece isn't the text field — it's the disc, because that is where you see why one letter becomes another.
Decisions
No backend. There is no server that could read what you type: the algorithm is a handful of lines of JavaScript running in your own browser. For a tool that handles the user's text, having no server isn't a limitation — it's the feature.
No framework. HTML, CSS and JavaScript. Loading React to shift letters would multiply the page weight a hundredfold for nothing.