Encrypt HTML With Password Gate

I need my existing HTML file wrapped in real encryption so that nothing inside the page is readable, view-sourceable, or previewable until a visitor types the correct password. Think of the experience you get when opening a password-protected PDF: a clean modal prompt, then instant access to the content once the key is validated.

Authentication has to be a simple password input. If the visitor enters anything else, the page should stay locked and display a clear “Wrong password” message without revealing any of the underlying markup.

• the HTML payload is actually encrypted, not just hidden with CSS/JS;
• the decryption happens client-side once the right password is supplied;
• the solution works in all modern browsers without extra plugins.

Deliverables
• One fully encrypted HTML file

I’ll test by opening the file, viewing source before and after entering the password, and confirming that only the correct passphrase unlocks the real content.