SHAKE-256: a RISC-V ISA extension for SLH-DSA
320-bit SIMD instructions on CV32E40P that swallow the Keccak hot path of post-quantum signatures, validated on a PYNQ-Z2.
Kimmy蔡丞昕
Putting cryptography into silicon, and writing about it afterwards.
Computer Science at National Cheng Kung University. I spend most of my time on the hardware side: RISC-V ISA extensions, FPGA bring-up, and accelerating post-quantum signatures. The rest goes into hackathons, and into writing down what broke.
FIG. 01Portrait
Currently
- Putting together graduate school applications; the research proposal builds on my capstone work on SLH-DSA hardware acceleration.
- 2026 DevJam, Google Cloud track — smart maintenance for road convex mirrors and early warning at blind intersections.
- Writing up a year of hackathons and hardware projects into something readable.
Selected work
See alltest
test
Corner.X — A Data Network for Street Mirrors
Turning the convex traffic mirrors nobody maintains into a ranked, dispatchable inventory, using street-view imagery and open accident data.
AI Investment Companion
Built for the CMoney × AWS AI Hackathon — turning a portfolio tracker from a bookkeeping form into something that speaks first.
Contest log
See all2026 DevJam Hackathon
In progressTheme "Agent × Smart City". We converged on road convex mirrors — a maintenance pipeline, oncoming-vehicle warning at unsignalised intersections, and mirrors doubling as road-condition sensing nodes.
Role Concept, system designTeam Team of fourStack Google Cloud · AI Agent · Computer Vision
Sea × OpenAI Regional Codex Hackathon
SubmittedChose a problem at the intersection of security and finance, building on my coursework in international financial markets and international security.
Role Proposal, developmentStack Web · LLM · Security
Mei-Chu Hackathon
SubmittedEntered with my capstone work — the SHAKE-256 RISC-V ISA extension for SLH-DSA.
Role FPGA integration and hardware testingStack RISC-V · Verilog · FPGA · Post-quantum crypto
Latest notes
See all- Taking my work off the hackathon serversAlmost everything I built used to live on Streamlit or Cloud Run, and then quietly died after the contest. Doing it differently this time.
- Simulation passed. The board disagreed.A FIFO arbiter cost me two weeks. The bug was not in the RTL — it was in my assumptions about what "simulation" means.
- Why we extended the ISA instead of bolting on an acceleratorPost-quantum signing spends almost all its time in Keccak. Given two ways to accelerate it, we took the harder one — because of data movement.
GitHub repos
All repositoriesKimmyTsai@github ~ $ ls -1
corner-x-mirrorCMoney_HackathonPIC18F4520-Driven-Touchpad-Gaming-System使用 PIC18F4520 微控制器搭配 4 線式電阻式觸控板，透過 UART 將觸控座標即時傳送至 PC 端，並以 Python（pygame）實現兩款遊戲：高精度絕對座標控制的 osu! 節奏遊戲，以及具物理摩擦力模擬的保齡球遊戲。系統整合 ADC 分時掃描、數位濾波、封包通訊與伺服馬達回饋機制。FPGA-Ping-Pong-Game利用Verilog編寫，在FPGA上配合VGA顯示，並透過Keypad控制，七段顯示器以及dot matrix顯示分數與控制方向。實作出彈球遊戲Shell-Implementation-In-CUsing C to implement shell in C. Within builtin command and external command implementation, the program can accept multiple commands connected by pipes.Search-with-TF-IDFReach me
Research collaboration, hackathon teams, or just wanting to talk about RISC-V and post-quantum crypto — email is best.