William Wang

I’m a third-year PhD student at NYU Courant interested in cryptography. In my free time, I play CTFs with DiceGang.

You can reach me over these channels:

• [email protected]
• @defund on Discord
• @kleptographic on Twitter

I’m also @defund on GitHub.

Papers

Preprints, publications, and manuscripts. Also see my Google Scholar.

1. Linear-Time Accumulation Schemes
   • Benedikt Bünz
   • Alessandro Chiesa
   • Giacomo Fenzi
   • William Wang
   TCC 2025
2. Arc: Accumulation for Reed–Solomon Codes
   • Benedikt Bünz
   • Pratyush Mishra
   • Wilson Nguyen
   • William Wang
   Crypto 2025
3. Accumulation without Homomorphism
   • Benedikt Bünz
   • Pratyush Mishra
   • Wilson Nguyen
   • William Wang
   ITCS 2025
4. Shorter Signatures from MQ
   • William Wang

Posts

• DiceCTF 2025 Quals
• Recap of 2024
• ångstromCTF 2024
• DiceCTF 2024 Quals
• Recap of 2023
• ångstromCTF 2023
• DiceCTF 2023
• Explaining the Rainbow Attack
• DiceCTF 2022
• hxp CTF 2021
• CSAW CTF Quals 2021
• DiceCTF 2021
• pbctf 2020
• redpwnCTF 2020
• CTFZone Quals 2019
• CSAW CTF Finals 2019
• CSAW CTF Quals 2019

Puzzles

• Crossword: Random Collisions (August 22, 2025)
• Pips (May 13, 2025)
• Mini Crossword: You Don't Know Ball (April 21, 2025)