Защищённые заметки: PIN-шифрование AES-256 (Android офлайн, один файл)

Защищённые заметки: PIN-шифрование AES-256 (Android офлайн, один файл)

📦 FORMAT · VERSION · GUARANTEE — quick overview before buying
• Contents: ZIP: single HTML file + README
• Version: September 2026
• Requirements: Any browser, no install, works offline
• Delivery: automatic, by e-mail right after payment
• Guarantee: the product matches its description. If anything is wrong — write a personal message, we´ll sort it out or refund you.
• Terms: for personal use; resale is prohibited.

PERSONAL NOTES NO ONE CAN READ WITHOUT YOUR PIN

Access codes, passwords, private stuff — encrypted with AES-256-GCM using a key derived from your PIN (PBKDF2-SHA256, 100,000 iterations, random salt). The PIN is stored nowhere: the device holds ONLY ciphertext — no titles, no texts, no PIN. Lose the phone — nobody reads your data.

WHAT´S INSIDE (a single index.html file):
• Real cryptography on the browser´s built-in WebCrypto (no homemade math)
• Every note gets its own random IV: identical texts → different ciphertext
• Wrong PIN → GCM tag rejects decryption (not "corrupted data" — just no access)
• Notes: title + body, add, edit with re-encryption, delete
• Search over titles and bodies (in memory, decrypted)
• Idle auto-lock: 0–240 minutes (default 5) + a "Lock now" button
• Dark and light themes
• Data stays on your device: no network, no cloud, no sign-up

HOW IT DIFFERS FROM "PHONE NOTES":
• Stock notes store plain text and often sync to a cloud
• Here data never leaves the device and is unreadable without the PIN even with full file access

IMPORTANT: forgot the PIN — there is no recovery (real privacy has no "security questions")

FOR WHOM:
• Codes/passwords/keys that must never hit a cloud
• Private notes on the phone you carry everywhere
• Anything that should live "on this device and nowhere else"

VERIFIED BEFORE SALE:
• 12 crypto selftests: cyrillic+emoji roundtrip, unique IV, foreign key/salt rejected, tampered ciphertext rejected, key-derivation determinism, 100 KB
• 13 live DOM tests: PIN creation errors, adding notes, NO plaintext in localStorage, search, reload → lock, wrong/right PIN, edit, delete
• Screenshots are from the real working app

Guarantee: replacement or refund. The file is delivered automatically right after payment.