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Checkpoint first lecture.

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---
author: Advanced Topics in Security and Privacy (CS 839)
title: Lecture 01
date: September 05, 2018
---
# Security and Privacy
## It's everywhere!
## Stuff is totally insecure!
## It's really difficult!
# What topics to cover?
## A really, really vast field
- Things we will not be able to cover:
- Real-world attacks
- Computer systems security
- Defenses and countermeasures
- Social aspects of security
- Theoretical cryptography
- ...
## Theme 1: Formalizing S&P
- Mathematically formalize notions of security
- Rigorously prove security
- Guarantee that certain breakages can't occur
> Remember: definitions are tricky things!
## Theme 2: Automating S&P
- Use computers to help build more secure systems
- Automatically check security properties
- Search for attacks and vulnerabilities
## Our focus: four modules
1. Differential privacy
2. Applied cryptography
3. Language-based security
4. Adversarial machine learning
# Differential privacy
## A mathematically solid definition of privacy
- Simple and clean formal property
- Satisfied by many algorithms
- Degrades gracefully under composition
# Applied crypto
## Computing in an untrusted world
- Proving you know something without revealing it
- Certifying that you did a computation correctly
- Computing on encrypted data, without decryption
- Computing joint answer without revealing your data
# Language-based security
## Ensure security by construction
- Programming languages for security
- Compiler checks that programs are secure
- Information flow, privacy, cryptography, ...
# Adversarial machine learning
## Manipulating ML systems
- Crafting examples to fool ML systems
- Messing with training data
- Extracting training information
# Tedious course details
## Class format
- Three components:
1. Paper presentations
2. Final project
3. Class participation
- Annoucement/schedule/materials: on [website](https://pages.cs.wisc.edu/~justhsu/teaching/current/cs839/)
- Class mailing list: [compsci839-1-f18@lists.wisc.edu]()
## Paper presentations
- Sign up to lead a discussion on one paper
- Suggested topic, papers, and schedule on website
- Before each presentation:
- I will send out brief questions
- Please email me brief answers
> If you want advice, come talk to me!
## Final project
- Work individually or in pairs
- Project details and suggestions on website
- Key dates:
- **September 19**: Pick groups and topic
- **October 15**: Milestone 1
- **November 14**: Milestone 2
- **End of class**: Final writeups and presentations
> If you want advice, come talk to me!
## Todos for you
0. Complete the course survey
1. Check out the course website
2. Think about what paper you want to present
3. Brainstorm project topics
# Defining privacy
## What does privacy mean?
- Many meanings of privacy
## Why is privacy hard?
## Hiding private data
- Remove "personally identifiable information"
## Problem: not enough
## "Blending in a crowd"
## Problem: composition
## Differential privacy
## Basic definition
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