This is a video owned by Tim Richardson and sometimes shown in classes dealing with computer security topics.

Essentially, the video is
a story about the development of some important cryptographic cyphers.

One team in England led
by a British government defence agency

One team in the United States
led by university researchers

The following text and links describes the content of the video.

intro

"Cryptography has fundamentally changed the course of history"

- example the enigma code machine www.kemble.org.uk/enigma.html

- every code ever devised suffered from a flaw - the difficulty of sending the key to translate the message

- the "key distribution" question is the oldest problem in Cryptography

- the key is the special recipe for first scrambling, then un-scrambling a message

- the problem of keeping the key away from danger is very expensive

- involved couriers and special armed messengersStanford - the idea was to challenge the convention that the sender take responsibility for the encryption

Diffie and Hellman proposed that the receiver take responsibility for the encryption

Narrator - mathematical locks are easy to make, but hard to undue - difficult to reverse

- multiplying 2 large numbers is the mathematical equivalent of a lock

- working it backwards is very very difficult

MIT mentioned in the video

- at the labs of MIT, in
the spring of 1976, Rivest, Shamir, and Adelman read the Diffie-Hellman
paper "New Directions in Cryptography." The three then decided to set out
making a multi-user cryptography system.

Rivest Shamir Adleman (RSA)

RSA is a public key cryptosystem
for both encryption and authentication.

It was invented in 1977.
It is an encryption algorithm that uses very large prime numbers to generate
the public key and the private key.

- most credit card information
encrypted with the RSA process

- meanwhile the Brits kept
their silence for two decades more

- the Americans who created
RSO were not the first to create public key encryption, but they were the
first to bring it out in the open, and, they made a lot of money

The video ends with the line

"Cryptography - The science
of secrecy is no longer a secret science"

A place on the RSA website to get great info on crypto topics |