Encryption for Everyone:What We Do Is Secret

Dru Streicher

Dru Streicher

•Systems Administrator ()

•Hardware Hacker

•Open Source Punk Rocker

•Collector of Arcane Technology & Vinyl Records

About Me

Encryption Basics

Encryption: What Is It for?

Why Is Encryption Important?

What Does It Look Like?

Encryption is Hard!

One Way Functions

•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

HTTP vs HTTPS

HTTP vs. HTTPS

HTTP vs. HTTPS

HTTPS

Meet Alice & Bob

Alice wants to share a secret message with Bob

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

They Use Symmetrical Encryption:

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

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

Bob knows the password so he can decrypt the message

Real world use for symmetric encryption:Disk Encryption

Disk Encryption• There are ways to access your drive and get around all that logging in stuff

• Encryption makes it private

Tools for disk encryption In linux

Asymmetrical Encryption

Alice and Bob have never met:

They use Asymmetrical Encryption

Public vs. Private Keys

Alice and Bob trade public keys

Alice encrypts her secret message using Bob's public key

Bob can then use his private key to decrypt the message

Key Servers

Creating Keys Using the Command Line

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

Revocation Certificate

Creating a Revocation Certificate

Thunderbird & Enigmail:Your one stop for PGP & Email

• 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

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

• 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

How Tor Works

How Tor Works

How Tor Works

Tor Software

• Exit nodes can be monitored

• Can be hard to configure

• Speed

Problems With Tor

• 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

VPN

Software VPN Options

Hardware VPN Options

• Lifehacker.com: How To

• Raspberry Pi

• Your Home Router:

• DD-WRT

• Tomato Router

• IM – Off The Record (OTR) plugin for Pidgin

• Android – K9

• SMS Encryption – TextSecure for Android

Other Encryption Tools

Encryption is About Privacy

More Info

Web

Beginners Guide

- Steven Levy

The Codebreakers - Dav

Questions?

Thanks• Ohio Linux Fest

• Ian Gillespie for the great slides

Contact Me

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