Technologycalendar_todayLast updated: Apr 2026
What is Cryptography?
/krɪpˈtɒɡrəfi/
The science of securing information by transforming it into an unreadable format (encryption) so only authorised parties can decode it. The backbone of all digital privacy and security.
lightbulb
Everyday Example
When you see a padlock in your browser address bar, cryptography is working behind the scenes — your data is encrypted so only you and the website can read it, even if someone intercepts it.
publicReal-World Application
“WhatsApp uses end-to-end encryption based on the Signal Protocol: not even WhatsApp itself can read your messages. Only the sender and recipient hold the keys to decrypt them.”
psychology
Did you know?
Alan Turing's work breaking the Nazi Enigma cipher at Bletchley Park during WWII is considered the founding moment of modern cryptography — and arguably shortened the war by two years.
emoji_objects
Key Insight
Every secure online transaction, password, and private message relies on a mathematical problem so hard that even the world's fastest computers would take billions of years to solve it by brute force.
Want to learn Cryptography in 60 seconds?
Join 50,000+ learners snacking on knowledge daily.