The document provides an introduction to encryption basics including symmetric and asymmetric encryption. It explains how symmetric encryption works with Alice and Bob sharing a password to encrypt and decrypt messages. It also explains how asymmetric encryption works with Alice using Bob's public key to encrypt a message that only Bob can decrypt with his private key. The document recommends tools for encrypting email, disks, and browsing privately including Thunderbird, TrueCrypt, and Tor. It discusses some challenges with encryption including managing keys and speeds with Tor. The overall purpose is to educate about the importance of encryption for privacy.

1. Encryption for Everyone:
What We Do Is Secret
Dru Streicher

2. Dru Streicher
•Systems Administrator ()
•Hardware Hacker
•Open Source Punk Rocker
•Collector of Arcane Technology
& Vinyl Records
About Me

3. Encryption Basics

4. Encryption: What Is It for?

5. Why Is Encryption Important?

6. What Does It Look Like?

7. Encryption is Hard!

8. One Way Functions

9. • Phonebook encryption
• Plaintext: S-E-C-R-E-T
• S = Jenny Smith 867-5309
• Cypher text then becomes 6 phone numbers
• To decrypt you would have to find each phone
number in the phone book
• Easy to make & Hard to solve
One Way Functions

10. HTTP vs HTTPS

11. HTTP vs. HTTPS

12. HTTP vs. HTTPS

13. HTTPS

14. Meet Alice & Bob

15. Alice wants to share a secret
message with Bob

16. They don't want Eve to be able to
get their secret message

17. They Use Symmetrical
Encryption:

18. Alice encrypts the message with a
password and sends it to Bob

19. Even if Eve intercepts the
message, without the password it
can't be decrypted

20. Bob knows the password so he
can decrypt the message

21. Real world use for
symmetric encryption:
Disk Encryption

22. Disk Encryption
• There are ways to access your drive
and get around all that logging in stuff
• Encryption makes it private

23. Tools for disk encryption In linux

24. Asymmetrical Encryption

25. Alice and Bob have never met:
They use Asymmetrical
Encryption

26. Public vs. Private Keys

27. Alice and Bob trade public keys

28. Alice encrypts her secret message
using Bob's public key

29. Bob can then use his private
key to decrypt the message

30. Key Servers

31. Creating Keys Using
the Command Line

37. If you lose your private key's password or your private key
becomes compromised you can revoke the key.
Revocation Certificate

38. Creating a Revocation
Certificate

41. Thunderbird & Enigmail:
Your one stop for PGP & Email

42. • Walk you through creating a gpg key in wizard mode.
• Manage all your keys
• Encrypt and Decrypt mail Automagically
• Sign outgoing email with your public key

43. Web Based Email
Gmail and Yahoo and other web based email providers
don't support encryption and decryption natively.

45. • The Onion Router
• “Tor directs Internet traffic through a free, worldwide
volunteer network consisting of more than three
thousand relays to conceal a user's location or usage
from anyone conducting network surveillance or
traffic analysis.” -Wikipedia

46. How Tor Works

47. How Tor Works

48. How Tor Works

49. Tor Software

50. • Exit nodes can be monitored
• Can be hard to configure
• Speed
Problems With Tor

51. • Virtual Private Network
• Creates an encrypted point-to-point network
• Allows you to remotely access your local network
resources such as printers, servers, computers
VPN

52. VPN

53. Software VPN Options

54. Hardware VPN Options
• Lifehacker.com: How To
• Raspberry Pi
• Your Home Router:
• DD-WRT
• Tomato Router

55. • IM – Off The Record (OTR) plugin for Pidgin
• Android – K9
• SMS Encryption – TextSecure for Android
Other Encryption Tools

56. Encryption is About Privacy

57. More Info
Web
Beginners Guide
- Steven Levy
The Codebreakers - Dav

58. Questions?

59. Thanks
• Ohio Linux Fest
• Ian Gillespie for the great slides

60. Contact Me
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