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01 ·Security·FREE·13 min read Cryptography from Scratch — Symmetric Keys, Public Keys, and Hashes Cryptography isn't about producing unreadable text — it's about engineering an extreme gap in effort between people who hold the key and people who don't. We build up the three tools (symmetric, public-key, hashing) from zero, explain why factoring shows up at all, what a signature actually promises, and how every widely deployed cipher has eventually broken. 02 ·Data Structures·★ MEMBER·PAPER·9 min read Hashing and Nearest-Neighbor Search — The Groundwork Under Vector Search Two inventions that made looking things up fast — the exact-match hash table, and LSH and HNSW for searching by meaning — from zero assumed knowledge. What is actually running underneath RAG and every vector database.