Cryptography Made Simple Part 3

In the final part of this 3 part tutorial on Cryptography, I take a look at Asymmetric crypto and discuss how it works and what it can do for you.
Key Security Principles
Defence in Depth
End to End protection
Understanding Asymmetric Cryptography
How Encrypted email works
Diffe Helman Algorithm
Hash Functions
As always I'd love your feedback and any questions you have below.

[bingomutant]

Thanks for this. DH were clever people !