Lab

Lab

Interactive security labs by Steven Foerster: prompt injection, memory corruption, threat modeling, and cryptography demos. Most tools run in your browser.

What this is

This is my public lab notebook in runnable form: prompt injection visualizers, memory corruption simulations, deterministic threat modeling, and cryptography demos. Most tools run fully in your browser.

Try breaking things. Seriously. If you find edge cases or bugs, open an issue or send me a note.

AI & Machine Learning

Interactive visualizations for understanding how AI systems work.

AI & Machine Learning

Embedding Space Explorer

Visualize how AI understands meaning through vector similarity and semantic clustering.

AI & Machine Learning

Classifier Threshold Lab

Drag a decision threshold across score distributions and watch precision, recall, and ROC curves update in real time.

AI & Machine Learning

RAG Pipeline Playground

Paste text, adjust chunk size and overlap, visualize how documents split into chunks, and run simulated similarity searches.

AI Safety & Red Teaming

Interactive demos for understanding AI vulnerabilities and adversarial techniques.

AI Safety & Red Teaming Start here

Prompt Injection Visualizer

Interactive demo of prompt injection attacks with visual breakdowns and defense patterns.

AI Safety & Red Teaming

System Prompt Architect

Guided step-by-step builder for LLM system prompts with security hardening and live preview.

AI Safety & Red Teaming

Jailbreak Sandbox

Test jailbreak techniques against progressively hardened defenses with simulated model responses and scoring.

AI Safety & Red Teaming

RAG Poisoning Simulator

Inject adversarial documents into a simulated RAG pipeline and observe how poisoned context changes retrieval and generation.

AI Safety & Red Teaming

Agent Attack Chain Visualizer

Step-by-step visualization of multi-tool agentic exploits with toggleable defenses.

Systems & Memory Safety

Visual explanations of low-level security concepts and failure modes.

Systems & Memory Safety Start here

Memory Corruption Playground

Hands-on, in-browser simulation of buffer overflows, use-after-free, and double free.

Systems & Memory Safety

Exploit Chain Visualizer

Step-by-step visualization of buffer overflow exploitation with defense mechanisms.

Risk & Threat Modeling

Deterministic analysis for early security and architecture review.

Risk & Threat Modeling

Faultlines

Deterministic threat-model synthesis without machine learning.

Risk & Threat Modeling

Alert Triage Simulator

Practice SOC alert triage under pressure. Learn to spot real threats in noise.

Risk & Threat Modeling

Wazuh Rule Builder

Write and test Wazuh custom rules and decoders against sample log lines in the browser.

Quantum Computing

Interactive visualizations for learning quantum mechanics and algorithms.

Quantum Computing Start here

Bloch Sphere Playground

Interactive 3D visualization of qubit states and quantum gate operations.

Quantum Computing

Quantum Circuit Builder

Drag-and-drop quantum circuit designer with state simulation and Qiskit export.

Quantum Computing

Shor vs Grover

See why Shor breaks RSA but not lattices, and why Grover only forces bigger symmetric keys, with interactive period finding and a Grover calculator.

Cryptography

Client-side cryptography demos and local-first tools.

Cryptography Start here

Paste

Client-side encrypted paste links with keys stored in the URL fragment.

Cryptography

Saf

Local file encryption bundles for secure sharing.

Cryptography

Paillier homomorphic addition demo

Add numbers while encrypted to see private computation in action.

Cryptography

Post-quantum cryptography

Post-quantum cryptography (PQC) demos and migration guidance.

Signals & Systems

Interactive tools for control theory, signal processing, and filter design.

Signals & Systems

Control Loop Lab

Interactive PID tuner with step response, Bode, root locus, and Nyquist plots for classical control systems.

Signals & Systems

Apollo Guidance Lab

Apollo-style lunar guidance simulator with state-space control, Kalman filtering, and interactive trajectory recovery.

Signals & Systems

Filter Designer

Design FIR and IIR digital filters with real-time frequency response and pole-zero visualization.

Signals & Systems

Phase Portrait Explorer

Visualize 2D dynamical systems with vector fields, trajectories, nullclines, and equilibrium classification.

Signals & Systems

Reaction-Diffusion Playground

Paint chemistry on a grid and watch Gray-Scott equations grow spots, stripes, spirals, and coral-like patterns in real time.

Signals & Systems

Fourier Epicycles

Draw any shape and watch a chain of spinning circles retrace it — a live Fourier series, built from your own scribble.

Signals & Systems

Heat Diffusion Painter

Paint hot spots, ice cubes, and walls on a grid; watch the heat equation spread temperature in real time.

Signals & Systems

Low-Energy Moon Route

See why low-energy Earth-Moon transfers can sneak through the L1 gravity gate. A three-body explorer with zero-velocity curves and Lagrange points.

Infrastructure

Interactive visualizations for GPU clusters, network fabrics, and cloud infrastructure.

Infrastructure

udev Rule Builder

Learn udev by building real /etc/udev/rules.d/ rules: device access, persistent symlinks, NIC renaming, hotplug triggers, and USB lockdown — with inline explanations and validation.

Infrastructure

GPU Topology Visualizer

Explore PCIe, NVLink, and NVSwitch GPU interconnect topologies and see how they affect collective communication performance.

Analysis & Calculators

Interactive tools for understanding real-world costs and trade-offs.

Analysis & Calculators

Theme Park Audit

Calculate the true cost-per-ride and time efficiency of a theme park trip, then discover alternatives.

Explainers & Guides

Plain-language framing for how the tools work.

Explainers & Guides

Tools privacy

Security model that explains what the tools store and never collect.