# Conventional Cryptography

- Institution: Gresham College
- Speaker: Professor Harold Thimbleby
- Year: 2002
- Level: For everyone
- Language: English
- Subjects: Mathematics, Computer science
- Source: [Gresham College](https://www.gresham.ac.uk/watch-now/conventional-cryptography)
- Licence: [Educational use (Gresham College's terms)](https://www.gresham.ac.uk/terms-and-conditions)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Keeping secrets is one of the earliest inventions of civilisation, and has become the science of cryptography. The World War II Enigma machine was just lots of scrambling, done in ways that could be understood in principle by a school child though it took daring and powerful computing to crack it. This lecture introduces the key ideas behind conventional cryptography, and explains why it is not good enough for modern applications such as international commerce on the Internet. The lecture also serves as an introduction to the following lecture (28 February) on modern cryptography.

## Lectures

1. [Conventional Cryptography](https://invisiblenetwork.ai/learn/gresham/conventional-cryptography/4c493b2b0228) (YouTube)