03-ssh.md

Git 3: SSH and Security

Setup

First lets see if you already have SSH keys setup

Follow these instructions for connecting to Github via SSH.

https://help.github.com/articles/connecting-to-github-with-ssh/

Lets see what we've just done

ls -al ~/.ssh/

This is your public key

cat ~/.ssh/id_rsa.pub

This is your private key

cat ~/.ssh/id_rsa

Cryptography Basics

A brief aside...

Videos:

• Cryptography 101
• What is Cryptography
• What is SSH

Images below sourced from David Brumly at Carnegie Mellon University

What can you do with these?

• Securely communicate with GitHub.
• Use them to encrypt files or data.
  • https://gist.github.com/colinstein/de1755d2d7fbe27a0f1e
• Use secure shell (ssh) to remote into another computer.
  • ssh into 538stats
• Copy a file securely from another computer using secure copy (scp).

So this is what encryption is all about?

Yeah, its a really powerful tool that doesn't require a geeky genius to use.

Other applications

• Encrypting Files
• HTTPS - We'll cover this more in a later lesson
• Cryptocurrency - https://walletgenerator.net/
• Verifying Identity, Chat, etc... (see keybase)

Want to know more?

• Questions
• If we have time I've invited a security expert to come and speak during our final class day.