public key crypto intro 1
An extremely short intro to cryptography, and why public-key cryptography changed everything.
(Next video will give an example demo'ing why public-key crypto is even possible.)
The page demo'ing the book-cipher is:
https://www.dcode.fr/book-cipher
Contents:
00m15s -- why public-key encryption is important (& the web is just packets)
01m45s -- Caesar cipher & permutation ciphers
02m38s -- remember that *pre*-arranged keys are essential to traditional encryption
03m25s -- book cipher
06m03s -- one-time pad
07m53s -- but how to pre-arrange a key, in spite of continual eavesdroppers
09m20s -- notation: encrypt, decrypt as functions `e`, `d`
-10m40s -- how a public-key system would be used (incl. some early-history)
