Computer Security 3 - Cryptography

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Cryptography - History

Aside: Public/Open Machinery Design

Classical: Private Key Cryptography ("symmetric")

private key encrypt/decrypt

Application: File Encryption

Modern: Public Key Cryptography

1. pub/priv key pair

public key cryptography

Public key Application -- Packet Secrecy

Public key Application -- Digital Signatures

Public key Application -- Digital Money

Future: Mozilla Persona Logins

How It Works

For this example, say you want to log in to www.123done.org using a Persona identity provided by www.persona.org.

persona login process

1. Create Persona Account

2. Log In Using Persona

3. Persona Advantages and Disadvantages

Future: Google Chrome OS / ChromeBook