CS 116: Introduction to Security

Tufts University Department of Computer Science, Fall 2021

Course Description

A holistic and broad perspective on cyber security. Attacking and defending networks, cryptography, vulnerabilities, reverse engineering, web security, static and dynamic analysis, malware, forensics. Principles illustrated through hands-on labs and projects, including Capture The Flag (CTF) games.

Sections

In-person, undergrads and grads: in person on Tuesdays, 4:30 - 5:45 PM EST in Braker Hall Room 1; Thursdays on Twitch except for September 9th (first day of class in Braker Hall Room 1)
Online Master's in Computer Science: live sessions on Wednesdays, 6:00 - 7:30 PM EST (via Zoom)

Instructor

Ming Chow, ming.chow@tufts.edu
Office Hours: Wednesdays from 1:30 - 3 PM EST in person in TBD, otherwise I am frequently online on Discord or on Piazza

Prerequisites

CS 15 or Data Structures equivalent course. Strongly recommended that you have taken CS 40. Please disregard prerequisites listed in the University's bulletin as they are incorrect!

Hardware and Software for This Class (on your personal computer)

Absolute Requirements

A modern web browser (e.g., Firefox, Google Chrome, Chromium, Safari, Microsoft Edge)
A command line interface to run Unix/Linux commands

Strongly Recommended Requirements

A computer with at least 40 GB of hard disk space free and 4 GB of RAM
Kali Linux and a Virtual Machine Hypervisor. IMPORTANT NOTE: virtual machine is currently not an option for Apple M1 Macs.

List of Security Tools That Will Be Used in Course

If you choose not to use a virtual machine, and is comfortable with installing software onto your own machine(s), the following is a list of security tools that will be used in the course. Reasons to not use a virtual machine include: a VM uses too much disk space, your computer does not support virtual machines (e.g., Chromebooks), you are skilled enough to spin your over virtual machines.

Wireshark
Nmap
Netcat
Python
Scapy
John the Ripper
Burp Suite
apktool and Java as apktool requires Java

List of Security Tools That Will Be Mentioned, But Not Mandatory

Assessment

For in-person version:
- Labs (70%)
- Quizzes (25%; there will be two)
- Subjective factors including asking appropriate questions, answering questions well, organizing study groups or security-related virtual events, etc. (5%)
For Online Master's section:
- Labs (55%)
- Quizzes (25%; there will be two)
- Final project (15%)
- Subjective factors including asking appropriate questions, answering questions well, organizing study groups or security-related virtual events, etc. (5%)

Course Infrastructure

Lab submissions: Canvas (Tufts UTLN required)
Quizzes: Canvas (Tufts UTLN required)
Announcements: Piazza
Discussions: Piazza
Further discussions, collaborations, and chillout areas:
- Discord - This is the Tufts CS Discord. Use #hacked channel for Security-related questions and issues.
- Slack - This is the JumboSec student group Slack. Many alums are also on there. Use the channel #116. Must have a Tufts email address to join.

Syllabus

Topic 1, on Thursday, September 9th	Course Introduction - By the end of this week, students will learn many of the fundamental Linux commands, an important skill for any good security practitioner, by playing Capture The Flags via OverTheWire. Students will remember the three principles of the CIA triad, critical to any organization’s security infrastructure. Readings and Videos	Lab 1: Working with the Command Line Publicly accessible version of Lab 1
Topic 2, starting Tuesday, September 14th	Networking and Packets - By the end of this week, students will be able to dissect packet captures (PCAPs), network traffic. Readings and Videos	Lab 2: Packet Sleuth Publicly accessible version of Lab 2
Topic 3, starting Tuesday, September 21st	Attacking Networks - By the end of this week, students will perform network reconnaissance and port scanning, and build a rudimentary Security Information and Event Management (SIEM) / intrusion detection system (IDS). Readings and Videos	Lab 3: Scanning and Reconnaissance This lab cannot be made publicly available. Lab 4: Snake Oil, The Incident Alarm Publicly accessible version of Lab 4
Topic 4, starting Tuesday, October 5th	Cryptography - By the end of this week, students will be able to crack passwords on a Linux or Windows system, use one-way hash functions, and briefly describe how Transport Layer Security works. Readings and Videos	Lab 5: Password Cracking Contest opens, due on Guy Fawkes Night (a month) Final Project opens (for Online Master's students only)
Topic 5, starting Tuesday, October 12th	Vulnerabilities - By the end of this week, students will know the difference between CVE and CWE. Readings and Videos	Quiz 1
Topic 6, starting Tuesday, October 19th	Web Security - By the end of this week, students will able to perform and defend against the following attacks: Cross-Site Scripting (XSS), SQL injection, Cross-Site Request Forgery (CSRF), session hijacking, cookie tampering, directory traversal, command injection, remote and local file inclusion. Students will also write a fuzzer to find any software vulnerabilities. Readings and Videos	Lab 6: The XSS Game Publicly accessible version of Lab 6 Lab 7: Gain Access to Website This lab cannot be made publicly available. Lab 8: The Fuzzer Publicly accessible version of Lab 8
Topic 7, starting Monday, November 1st	The Capture The Flags (CTF) Game Played Online - By the end of this week, students will be able to find and take advantage of a number of vulnerabilities on a live web application. Readings and Videos	Lab 9: The CTF Write Up Publicly accessible version of Lab 9
Topic 8, starting Tuesday, November 9th	Static and Dynamic Analysis - By the end of this week, students will be able to perform static analysis and dynamic analysis scans on software, write a technical risk analysis that is communicated to upper management. Readings and Videos	Lab 10: Technical Risk Analysis
Topic 9, starting Tuesday, November 16th	Malware - By the end of this week, students will be able to describe types of malware, see certain malware behaviors, scan and analyze malware, reverse engineer Android apps to determine if they are malicious. Readings and Videos	Lab 11: Android Malware Analysis Publicly accessible version of Lab 11 Quiz 2
Topic 10, starts Tuesday, November 30th	Forensics and Incident Handling - By the end of this week, students will be able to acquire data from a disk (e.g., USB drive) using `dd`, analyze image of disk from `dd` using forensics tools, and recover deleted files off a disk. Readings and Videos
Topic 11, starts Tuesday, December 7th	The Future: Nihilism or Hope? - By the end of this week, students shall debate and ponder the hard questions in security, and be able to argue multiple viewpoints. Readings and Videos

Thursdays on Twitch Live Schedule

(From spring 2021) Using Kali Linux VM and Command Line
Thursday, September 16th: Packet Analysis Using Wireshark
Thursday, September 23rd: Basic Reconnaissance using Nmap
Thursday, September 30th: Distributed Denial of Service (DDoS) Attacks and Scapy feat John Hammond
Thursday, October 7th: Password Cracking with John the Ripper
Thursday, October 14th: Vulnerability Scanning, Exploitation, Badness-O-Meter
Thursday, October 21st: SQL Injection and Web Proxies
Thursday, October 28th: Special Episode Celebrating National Cyber Security Awareness Month
Thursday, November 4th: OFF AIR
Tuesday, November 9th: Really, Really Bad Code and Static Analysis
Thursday, November 11th: Veterans Day
Thursday, November 18th: Malware, Backdoors, Using VirusTotal
Thursday, December 2nd: Basic Forensics
Thursday, December 9th: The Hard Problems in Security

Topics That Will Not Be Covered In This Course

Social Engineering
x86, x64, ARM Reverse Engineering
Privacy

Frequently Asked Questions

Q: Is there a textbook for this course?

A: No

Q: Are there teaching assistants (TAs) for this course?

A: No

Q: What is the workload of this course?

A: Here is a list of all the labs with expected length and difficulty:

Lab 1: Working with the Command Line, Short (1 hour max) to Long (3+ hours) --you can put in as much time as you want on this lab
Lab 2: Packet Sleuth, Medium (1 - 3 hours)
Lab 3: Scanning and Reconnaissance, Very short (30 minutes). NOTE: This lab cannot be made publicly available because an actual target is used.
Lab 4: Python and the Incident Alarm, Long (over 3 hours) to Impossible
Lab 5: The Password Cracking Contest, If you crack all the password hashes (read: good luck with that), you will receive an automatic "A" in the course
Lab 6: The XSS Game, Medium
Lab 7: Gain Access to Website, Very short. NOTE: This lab cannot be made publicly available because an actual target is used.
Lab 8: The Fuzzer, Short to Medium
Lab 9: The CTF Game, One week --team based. NOTE: This lab cannot be made publicly available because an actual target is used.
Lab 10: Technical Risk Analysis, Short to Medium.
Lab 11: Android Malware Analysis, Short to Medium

Q: Does this course count towards the M.S. in Cybersecurity and Public Policy?

A: Yes

Q: Does this course count towards the M.S. in Software Systems Development?

A: Yes. In fact, this is one of the four required courses for the M.S.

Q: Why is using a Kali virtual machine not mandatory for this class and thus strongly recommended?

A: The reasons:

Accessibility. For students who are visually impaired, using a virtual machine can be very difficult.
Not all students have a capable laptop. Sometimes due to financial reasons, some students use Chromebooks. The tools required for this course can be installed natively on macOS, Windows, and Linux.
Performance. Sometimes, using a VM can be very slow. A VM also do not use native drivers (e.g., for networking).
Apple M1 Macs cannot run most Intel x86 virtual machines.

Q: Is Piazza used in this course?

Yes, quite a lot

Q: Why is there a course website and a course Canvas? If you say "it is a nuisance for students to use multiple websites and services for one course", what gives?

This course website serves a few critical purposes. Years ago, I made a decision to make all the readings, slide decks, and most of the labs publicly available. The reasons: (1) to show that Tufts is serious and is working on Cyber Security matters, (2) to provide learning material to the public on Cyber Security as the Cyber Security education problem is very dire, (3) for recordkeeping on what is taught and not taught in this Security class --this comes up often when we speak to industry and organizations who want to work with Tufts on Cyber Security-related matters. The Canvas site for this course isn't made publicly available. Even if Canvas site was made publicly available, content is behind a walled garden, and (4) for redundancy if Canvas goes down.

Q: I have not taken a course on Networks (CS 112), Operating Systems (CS 111), or Computer Architecture (CS 40) yet. Is that a problem?

No. Cyber Security is a very broad field and it is impossible for anyone, even professionals, to know everything. What is important for you is to start thinking about Security.

Q: If I am taking this course for professional purpose, can I have a tuition reimbursement letter or certificate?

A: Absolutely! It's a nice tuition reimbursement letter, hand signed!

Course Policies

Labs

All labs for a given topic, except for the password cracking lab and CTF writeup, are due on a Sunday at 11:59 PDT.
With the exception of password cracking lab and CTF game, you are granted an automatic extension of 24 hours at no cost (i.e., grace period). A lab submitted after the grace period will not be accepted.
No extension tokens.

Accessibility Statement

Tufts is committed to providing equal access and support to all qualified students through the provision of reasonable accommodations so that each student may fully participate in the Tufts experience. If you have a disability that requires accommodations, please contact the StAAR Center (formerly SAS) staarcenter@tufts.edu or 617-627-4539 to make an appointment to determine appropriate accommodations. Please be aware that accommodations cannot be enacted retroactively, making timeliness a critical aspect for their provision. You can learn more about the StAAR Center at https://students.tufts.edu/student-accessibility-services.

Expectations and Structure of This Course

This course will be a fun one for sure. A few notes on the expectations and structure of this course:

1. You are responsible for your own learning.

A very important point: if you want everything gone over in lecture or in notes, then this is not the course for you. More importantly, that's not how things work in real life.

2. You will learn by doing.

Each week, there will be at most three labs to hone your skills and to aim at the crux of the matter for the week. Here's an analogy: you don't learn how to cook simply by just reading cookbooks and watching YouTube videos. You learn by making, using your hands, and making mistakes.

3. You will learn by asking questions.

It is your responsibility to ask questions early and to ask for help...

4. ...and I expect discussions online to be very active and civil.

Share thoughts and respond to other people's questions. I will be online constantly. It is no secret that I respond very quickly unless I need to be away.