1. Big Data & Privacy
Review - summary

2. Big Data Moore’s ‘law’ – processor speed doubling every 2 years
How would you define “big data”?
What are benefits of big data?
What are some concerns about big data collection & use?
How is information being collected by technology every day?

3. Privacy issues Privacy policies from apps / websites
Who gets to use / look at your data?
What do we get for the privacy we give up?
How are banking, shopping, browsing, & connecting online all subject to ‘prying eyes’?
Does this concern you?

4. encryption
Symmetric encryption – uses the same key for encrypting and decrypting
Caesar cipher
Random substitution cipher
Strong encryption techniques have mathematical properties ensuring original message can’t be easily retrieved [computationally hard]
Keys – “code” to encrypting / decrypting message

5. Encryption continued
Asymmetric encryption – uses one key to encrypt and another to decrypt
Public key – encrypting key is public, but needs private key to decrypt
Private key – used to
Modulo – remainder after division. This operation is “one way” function. [multiply  divide, add  subtract] – can’t reverse modulus.

6. Cybersecurity Ddos – Distributed Denial of Service
Phishing – scamming to get personal information
Virus – executable program that installs on your machine – causes damage or automates