# Who invented Cryptography?

- Institution: Gresham College
- Speaker: Professor Robin Wilson
- Level: For everyone
- Language: English
- Subjects: Mathematics
- Source: [Gresham College](https://www.gresham.ac.uk/watch-now/who-invented-cryptography)
- Licence: [Educational use (Gresham College's terms)](https://www.gresham.ac.uk/terms-and-conditions)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

An excerpt taken from a lecture by Professor Robin Wilson called 'Number Theory: Queen of Mathematics' In which years does February have five Sundays? How many right-angled triangles with whole-number sides have a side of length 29? How many shuffles are needed to restore the order of the cards in a pack with two Jokers? Are any of the numbers 11, 111, 1111, 11111, . . . perfect squares? Can one construct a regular polygon with 100 sides if measuring is forbidden? How do prime numbers help to keep our credit cards secure?

## Lectures

1. [Who invented Cryptography?](https://invisiblenetwork.ai/learn/gresham/who-invented-cryptography/0a9034d4cda2) (YouTube)