Deep-dive guides & documentation
Comprehensive tutorials, official biometric and cryptographic specifications, and privacy engineering guides managed in Git.
The AI Airlock Pattern: Stripping PII and Secrets Locally Before Prompting Cloud LLMs
How to debug production logs and contracts with ChatGPT, Claude, or Gemini without leaking customer emails, IP addresses, or bearer tokens.
Read full guide →Architecture & Privacy · 7 min readHow Client-Side WebAssembly & WebGPU Replace Cloud File Utilities Without Uploading a Single Byte
Why uploading passport photos, tax forms, and production JSON/JWTs to free online converters is a critical privacy leak—and how modern browsers execute the same workloads locally.
Read full guide →Digital Privacy · 6 min readWhat Hidden EXIF Metadata Reveals About You—and How Local Binary Scrubbing Works
How JPEG APP1 segments store exact GPS coordinates, altitude, camera serial numbers, and owner names, and how to strip them before sharing.
Read full guide →AI Agents & MCP · 6 min readBuilding for Humans and AI Agents: Model Context Protocol (@privacyfold/mcp) & Deterministic Schemas
How a single JSON tool manifest powers both an accessible human interface and deterministic tool-calling for Claude Desktop, Cursor, and autonomous agents.
Read full guide →Photo & ID Standards · 8 min readComplete Guide to Official Passport & Visa Photo Dimensions (US, UK, EU Schengen, Canada & India)
Exact millimeter and pixel dimensions, head-height ratios, background colors, and 4x6-inch print-sheet layouts so your application is never rejected.
Read full guide →Cryptography · 7 min readZero-Knowledge Browser Cryptography: AES-256-GCM, PBKDF2, and Self-Decrypting HTML Envelopes
How to encrypt confidential notes and recovery keys in your browser so recipients can unlock them offline in any web browser without installing software.
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