# ZK Frontiers: Week 2 Exercises ## ZK Passwords In this exercise, you will implement a ZK-based password verifier! - Instructions can be found in the README of the scaffolding [repo](https://github.com/0xPARC/zkf-password-example). You are aiming to produce something that looks like this [video demo](https://drive.google.com/file/d/1nrlomVqvlsu8Ytc6SH0W5tSDrOK1sevu/view?usp=sharing). - You can start with the scaffolding [repo](https://github.com/0xPARC/zkf-password-example), or you can roll your own from scratch. - If you use the scaffold repo, make sure to check out [circom-starter](https://github.com/0xPARC/circom-starter), the base repo which this is based on! - Extension: make proving happen in-browser. - We’ll go over this during next week’s Monday optional session. You may also find this circom and snarkjs [diagram](https://www.notion.so/Circom-and-snarkjs-diagram-2ae9f63de55e46a49eadc23021c9fc43?pvs=21) useful. ## Optional: Implement group signatures Implement in circom the circuits discussed in [Core Session 3](https://docs.google.com/presentation/d/1MFbU1gOB228Kn7LkwxuqWt6BwCcrIGILRKb7yRMwtoQ/edit?usp=sharing). The current zkmessage circuits (slide 37) can be found [here](https://github.com/0xPARC/zk-group-sigs).
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ZK Frontiers: Week 3 Exercises

For this week's exercise, you will write a spec for one of the following proposed applications. If you are working on a project, you're automatically "exempt," as you'll already be building one of these! In your spec, you should: Outline precisely the ZK circuit(s) you'll be using. You can use our template from class if you'd like. Describe the business logic of the major components of the application: the server (what it stores, what it verifies, etc.) smart contracts (if applicable), clients (what they store, what they prove, etc.), and any additional services (for example, an auxiliary server that stores, verifies, and serves Merkle groups). WhaleChat

6/14/2023
ZK Frontiers: Week 1 Exercises

This week's exercises are hands-on coding exercises. Try writing the following circuits on your own. If you get stuck, you can check the solutions. We'll go over these circuits in the second Optional Session in Week 2. If you need to look up circom language features or syntax, take a look at the circom docs. I recommend trying to build these circuits in zkREPL, for fast iteration. I recommend doing these exercises in order, as later circuits may build on previous ones. References Field Size All signals in circom are treated as numbers modulo this big prime:

6/1/2023
Zupass Resources for Developers

Zupass Official Repo: https://github.com/proofcarryingdata/zupass The README provides a starting point for devs. Usage Examples for Devs: https://consumer-client.onrender.com This page contains examples for devs on how to integrate Zupass into various application flows, such as authentication, proof generation/consumption. Code for these examples is in the official Zupass repo. Example Application: Zuzalu Confessions: https://confessions-client.onrender.com/ This is a fully-functional anonymous message board built on Zupass, demonstrating authentication and identity-hiding proofs. For development/demonstration/reference purposes only! Zuzalu Confessions Reference Code: https://github.com/proofcarryingdata/zuzalu-confessions

4/11/2023
Syncing Your Zuzalu Passport

The Zuzalu Passport is an app that lets you prove that you are a Zuzalu resident or visitor (using zero-knowledge cryptography!). You'll use it to access both digital and physical spaces at Zuzalu. For example, your Passport will generate a QR code that you can show on mobile, that can be scanned for access to Zuzalu co-working spaces. Your Passport also allows you to log into the Zuzalu website, to sign up for Zuzalu events. Once you've created your Passport, if you want to use your Passport on a device other than the one you first logged in on, you'll need to follow two easy steps. Step 1: Copy your Passport Key from your original device To do this, hit the settings icon in the top right-corner of the Passport app, and then tap "Copy Key for Sync."

4/7/2023
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