Gnu Privacy Guard and You (Math-sanitized version)

This talk highlights why GPG is more relevant than ever in a modern age where government spying is the norm and no one on the internet can be trusted. We also take a dive in to how the RSA public key algorithm works at its core and how you can get started with GPG *today*.

Transcript

1. GNU Privacy Guard and you
2. ariejan https://ariejan.net
3. KABISA http://kabisa.nl
5. WHY is this YOUR problem?
6. “Just because you're paranoid doesn't mean they aren't after you” Joseph Heller, Catch-22
11. TRUST
12. HOW DOES ENCRYPTION WORK
13. HISTORY
14. SYMMETRIC KEY ENCRYPTION
16. Symmetric Key Encryption a b c d e f g h i j k l m n o p q r s t u v w x y z | | | | | | | | | | | | | | | | | | | | | | | | | | c d e f g h i j k l m n o p q r s t u v w x y z a b "a secret massage".encrypt # => "c ugetgv ocuucig"
17. Symmetric Key Decryption c d e f g h i j k l m n o p q r s t u v w x y z a b | | | | | | | | | | | | | | | | | | | | | | | | | | a b c d e f g h i j k l m n o p q r s t u v w x y z "c ugetgv ocuucig".decrypt # => "a secret massage"
18. ??? a b c d e f g h i j k l m n o p q r s t u v w x y z | | | | | | | | | | | | | | | | | | | | | | | | | | n o p q r s t u v w x y z a b c d e f g h i j k l m
19. ROT13 a b c d e f g h i j k l m n o p q r s t u v w x y z | | | | | | | | | | | | | | | | | | | | | | | | | | n o p q r s t u v w x y z a b c d e f g h i j k l m "Hello World".rot13.rot13.rot13.rot13 #=> "Hello World"
20. PROBLEM?
21. PUBLIC KEY ENCRYPTION
22. Why does RSA work? e*d = 1 mod ϕ(n) Public Key: [e,n] Private Key: [d, n] def encrypt(message, e, n) (message ** e) % n end def decrypt(message, d, n) (message ** d) % n end
23. LARGE numbers
24. Encryption with GPG
25. Encryption has NOTHING to do with TRUST
26. Cryptographic signatures
27. Signatures have NOTHING to do with TRUST
28. There is no Central Authority
29. WEB of TRUST
30. NOW WHAT?!
31. Not just for comms
32. GPG And Your Business
33. So why are we not using GPG all the time?
34. GnuPG Field Guide 1.Don't panic! 2.Get GPGTools for Mac or brew install gpg2 3.Setup your own keys 4.Exchange and sign keys (with trust) 5.Spread the word!
35. Next up
36. THANKS! » https://ariejan.net » ariejan@ariejan.net » @ariejan GPG Public Key » http://aj.gs/pubkey 8450 D928 4373 164E 25CC 7E0D AD73 9154 F713 697B