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Latest articles
Tutorials, updates, and insights from PetexSpace.
How to Test a Keyboard and Mouse: A Step-by-Step Diagnosis
Use browser input tests to separate hardware faults from settings, connection, browser, and operating-system problems before replacing a keyboard or mouse.
What Is AI, Really? How It Learns, Generates, and Gets Things Wrong
AI already filters inboxes, ranks routes, recognizes images, and drafts text. Learn what happens underneath, why systems fail, and when an output deserves trust.
Passwords vs Passkeys: How Modern Sign-In Actually Works
Passwords and passkeys protect accounts in fundamentally different ways. Learn what stays on your device, what a service stores, and where risk remains.
How Chatbots Really Work: Rules, Retrieval, LLMs, Tools, and Human Handoff
A practical, in-depth guide to chatbot architecture, from rules and intent matching to RAG, language models, tool calls, safety, and human handoff.
A Practical Guide to PetexSpace Online Tools
Find the right PetexSpace utility, understand what each tool supports, and move between related tasks efficiently.
How QR Codes Work: Structure, Scanning, Reliability, and Safety
Learn what the square patterns do, how data and error correction fit inside a QR Code, why some codes fail to scan, and what to check before opening one.
Imported ZIP verification
This paragraph verifies a Notion-style ZIP import with an image.
The Architecture of Time-Based One-Time Passwords: Inside RFC 6238 and HMAC Generation
A comprehensive mathematical and protocol analysis of RFC 6238 Time-Based One-Time Passwords (TOTP), exploring dynamic truncation, HMAC-SHA1 step counters, clock drift mitigation, and secure in-browser execution.
Anatomy of a QR Code: Reed-Solomon Error Correction and Matrix Encoding
A deep mathematical exploration of ISO/IEC 18004 QR codes, detailing Galois Field GF(2^8) arithmetic, generator polynomials, Reed-Solomon error correction, and in-browser matrix rendering.