Engineer. Generalist. Philosopher.

Presentation on breaking RSA encryption using Quantum Computers

Presentation on breaking RSA encryption using Quantum Computers

Hi I’m Chirag Madaan.

I do a lot of AI and Cryptography. I’m currently building the Shipment Tracking platform at PayPal and have previously designed protocols securing 10,000+ hardware wallets at Cypherock¹. Here’s a bit more about me before I show you my work:

• I call myself a generalist because I do anything and everything wherever problems are most interesting.
• I have an unrealistic wish to learn ALL the art, science, math, music, architecture and philosophy in the world.
• I approach problems from first principles and believe that every problem has at least one acceptable solution.
• Beyond building, I LOVE teaching. I’ve delivered many sessions on technical topics at PayPal and my university with audiences of 200+ people.
• I often think about consciousness, technology, its impact and our future, and I’m excited to share some of my thoughts through this blog.

Some of My Major Work

AI & Automation

1. B-Hunter: Penetration Testing AI Agent (2023)

• ReAct based LLM-powered agent to automatically detect web security vulnerabilities.
  
• The agent acts as a bug bounty hunter and uses penetration testing tools to plan, reconnaissance, exploit and generate a testing report automatically.
• Won 1st place among 100+ participants in PayPal’s internal hackathon.

2. Hidden: Hardware HID Module for Voice Accessibility² (2023)

• Allows complete control over any computer through voice without installing any software.
  
• Uses voice models and LLMs to parse complex multi-turn speech into keyboard and mouse instructions and injects them through the HID module.
  
• Aimed to help differently-abled people, while also looking very cool in action.
  
• Won VIT’s hardware Make-a-thon • Recognized by Danfoss.

3. API Migration Agentic Workflow (2025)

• A semi-automated AI workflow to migrate PayPal’s shipping aggregator’s legacy API connection to the new versioned API.
  
• Requires minimal human in the loop • Migrated code now in production.

4. Shipping Carrier Recommendation Solution (2023)

• Suggests shipping carriers to merchants for more reliable delivery based on various parameters.
• Won the 2nd place in PayPal’s Curioso hackathon.

Security & Cryptography

1. OAuth Library for MCP Servers (2025)

• Library for MCP Servers to allow users to login through PayPal and access PayPal’s services.
  
• The flow implemented is in compliance with OAuth2.1 flow as described in the MCP specification.³
  
• Recognized by PayPal’s CTO in his email newsletter.

2. Cryptography Research on TSS using AHE⁴ (2024)

• Published a paper on building decentralised access control solution for group digital asset management.
  
• Developed a novel multi-group architecture for secure threshold signature generation.
• Uses an optimized three-round threshold signature scheme, additive homomorphic encryption, and zero-knowledge proofs.
  

3. Remote Wallet Provisioning Protocol (2024)

• Designed and implemented a cryptographic protocol to securely provision new Cypherock hardware wallets with keys remotely from USA to Indian packaging site.
  
• Secured 10,000+ Cypherock X1 devices till now with zero security incidents to date.

4. MPC Threshold Signature Scheme on Cypherock X1 (2024)

• Low-level C firmware implementing MPC-based Threshold Signature Scheme on embedded hardware.
  
• Powers secure multi-party computation on resource-constrained Cypherock X1 hardware wallet to allow groups to own digital assets together.

5. Anonymous Online Voting System (2021)

• Secure voting system using custom implementation of Linkable Spontaneous Anonymous Group Ring Signatures.
  
• Ensures voter privacy while preventing double-voting.
• Project got an S grade for novelty.

Other Projects

1. Atomic Events Android SDK (2024)

• Led the project and delivered it end to end from designing the HLD to planning the architecture to the implementation to the final release.
• Allows android teams to have observability across customer interactions on the PayPal app.
• Integrates with all internal observability platforms.

2. PayPal Confluence Redirector (2024)

• Browser extension that automatically redirects old broken confluence links before PayPal’s migration, to new ones very quickly.
• Currently used by 400+ people.

3. RTT Migration (2023)

• Migrated PayPal’s Real Time Shipment Tracking functionality to a new more optimised and maintainable Java backend architecture.

Let’s Connect

Feel free to reach out if you’re working on something interesting or just want to exchange ideas about where technology is heading. Check out my contact details on the sidebar.

References

1. Cypherock ↩︎

2. Hidden - The hardware HID module. ↩︎

3. MCP Authorization ↩︎

4. Research Paper on TSS using AHE. ↩︎