- Username: restrict to [A-Za-z0-9_-], block reserved names (admin, mod, root, etc.), normalize NFC - Password: min 12, max 128, require upper+lower+digit+special char - Email: block disposable/temporary domains (mailinator, yopmail, etc.) - Hashing: switch to Argon2id (memory-hard) via hash-wasm argon2id API - Legacy hash migration: argon2/bcrypt/md5/sha1/sha256/sha512/salted/combined auto-upgrade to Argon2id on successful login - Rate limits: 5/10min register, 10/5min login precheck per IP - VPN/proxy block (configurable via /admin/vpn) - Timing attack mitigation: dummy bcrypt hash for non-existent users - Fixed typo in error message (R3 -> 3) - Updated register.test.ts to match new validation rules