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Encode and decode secret messages as musical note sequences directly in Gmail and Facebook Messenger. EUVOLI — PASS MESSAGES IN MUSIC Euvoli brings an entirely new kind of privacy to your email and messaging. Instead of obvious encryption that signals "something secret is here," Euvoli transforms your message into a beautiful sequence of musical notes — passing it in plain sight where no one would ever think to look. ───────────────────────────────────────── WHY EUVOLI IS DIFFERENT ───────────────────────────────────────── Every other privacy tool — Signal, PGP, encrypted email — has one fatal flaw: it's obvious. When someone sees an encrypted message, they know a secret exists. In repressive environments, that alone can be dangerous. Border agents, surveillance systems, and deep packet inspection tools are all trained to detect encryption. Euvoli takes a completely different approach. Your message doesn't look encrypted — it looks like music data. A JSON note sequence shared in an email or message raises no flags, triggers no algorithms, and attracts no attention. The message isn't just unreadable without the key — its very existence is concealed. This is steganography: concealing the fact that a message exists, not just its contents. ───────────────────────────────────────── WHAT EUVOLI DOES ───────────────────────────────────────── Euvoli encodes any text message as a sequence of musical note pairs using the Melography protocol — a cryptographic system where each character maps to a unique pair of musical notes through a passphrase-derived cipher. The same letter maps to completely different notes every time it appears, making frequency analysis impossible. Without the correct passphrase, an observer cannot even locate where the message begins or ends — let alone read it. In Gmail, Euvoli adds a simple 🎵 Encode button to your compose window. Type your message, enter a shared passphrase, click Encode & Insert — and your message becomes a stream of note data sitting quietly in your email. When your recipient opens the email, a 🎵 Decode Euvoli Message button appears automatically. They enter the passphrase and read your original message. In Facebook Messenger, Euvoli adds a 🎵 button directly in the message toolbar alongside the native emoji, photo, and GIF buttons. Encode any message before sending it. Recipients see a Decode Euvoli Message option in the three-dot menu on any received Euvoli message. ───────────────────────────────────────── HOW IT WORKS — THE MELOGRAPHY PROTOCOL ───────────────────────────────────────── Melography is a deterministic bidirectional mapping system that converts text into musical note pairs: 96 printable characters mapped to 130 unique note pairs Each character uses TWO musical notes — creating rich musical intervals Polyalphabetic cipher: same character → different notes every time Passphrase feeds into PBKDF2 key derivation → ChaCha20 stream cipher Each character position gets a unique cryptographic offset Message boundaries are concealed — without the key, you cannot find where the message starts or ends Steganographic padding before and after the message conceals its length The note sequence sounds like real music when played back The result is a system where: ✓ Content is protected — unreadable without the passphrase ✓ Existence is concealed — message boundaries unlocatable without the passphrase ✓ Length is concealed — padding obscures how long the message is ✓ Frequency analysis is defeated — polyalphabetic mapping ✓ No dedicated infrastructure needed — works over any platform ───────────────────────────────────────── FEATURES ───────────────────────────────────────── ✦ ONE-CLICK ENCODING IN GMAIL Click the 🎵 Encode button in any Gmail compose window. Type your message, enter your shared passphrase, choose to insert as text or download as a file. That's it. ✦ FACEBOOK MESSENGER SUPPORT A 🎵 Euvoli button sits naturally in the Messenger toolbar alongside emoji, photo, and GIF buttons. Works in both the full Messenger page and the modal chat window. Decode option appears in the three-dot menu on received Euvoli messages. ✦ AUTOMATIC DECODE DETECTION When you receive an email containing an Euvoli note sequence, a 🎵 Decode Euvoli Message button appears automatically at the top of the email. Enter the passphrase to reveal the message instantly. ✦ LOCAL ENCODING — YOUR MESSAGE NEVER LEAVES YOUR DEVICE All encoding and decoding happens in your browser. Your plaintext message is never transmitted to any server. The passphrase never leaves your device. Only the encoded note sequence — which is meaningless without the key — is inserted into your email or message. ✦ PASSPHRASE PROTECTION Share a passphrase with your recipient through any channel — a phone call, in person, a previous message. Once established, all future communication using that passphrase is protected. ✦ TRANSPORT AGNOSTIC The encoded note sequence is just text — it works over any platform that can carry text or files. Email, messaging apps, social media posts, SMS. If you can send text, you can send an Euvoli message. ✦ MUSICALLY AUTHENTIC The note sequences are designed to sound like real music when played back. The Euvoli web app at euvoli.qizhonglabs.com lets you hear your encoded message played on piano, strings, music box, harp, or brass. ✦ NO ACCOUNT REQUIRED Install and start encoding immediately. No sign-up, no account, no personal information required. ───────────────────────────────────────── WHO EUVOLI IS FOR ───────────────────────────────────────── JOURNALISTS AND ACTIVISTS Communicating in environments where encryption is detected, flagged, or illegal. Euvoli messages pass through surveillance systems as ordinary data files. No Euvoli-specific traffic pattern exists to block or detect. PRIVACY-CONSCIOUS INDIVIDUALS Anyone who wants genuine privacy without the social signal that comes with obvious encryption. Your communication looks completely ordinary. HUMAN RIGHTS DEFENDERS Operating in regions where encrypted communication attracts unwanted attention. Euvoli provides plausible deniability — the note sequence is just music data, nothing more. BUSINESSES WITH CONFIDENTIAL COMMUNICATIONS Legal, financial, medical, or strategic communications that require discretion beyond standard email security. CREATIVE USERS Pass personal messages inside music. Send someone a melody that only they can decode. Use it as a novel form of personal expression. ───────────────────────────────────────── PRIVACY AND SECURITY ───────────────────────────────────────── Euvoli is built on a simple principle: we cannot read your messages even if we wanted to. All encoding happens locally in your browser Your message never travels over the network in plaintext Your passphrase is never stored or transmitted The extension only accesses mail.google.com and facebook.com to inject buttons No message history is stored anywhere No account or personal information is required HTTPS enforced on all connections Full privacy policy: https://euvoli.qizhonglabs.com/privacy. ───────────────────────────────────────── THE MELOGRAPHY PROTOCOL ───────────────────────────────────────── Melography is an open protocol developed by QIZHONG LABS combining cryptographic security with musical steganography. Unlike traditional encryption which conceals content, Melography conceals the existence of communication itself. Key technical properties: PBKDF2 key derivation with 100,000 iterations ChaCha20 cryptographically secure stream cipher Polyalphabetic substitution — defeats frequency analysis Chaffing and winnowing — random padding conceals message boundaries Statistical indistinguishability — encoded sequences match natural music distribution Compression immune — JSON format survives audio transcoding and platform processing Deep packet inspection resistant — no Euvoli-specific traffic signature ───────────────────────────────────────── GETTING STARTED — GMAIL ───────────────────────────────────────── Install the Euvoli extension Open Gmail and click Compose Click the 🎵 Encode button in the toolbar Type your message Enter a passphrase you've shared with your recipient Click Encode & Insert Send your email normally Your recipient installs Euvoli, opens the email, clicks 🎵 Decode Euvoli Message, enters the passphrase, and reads your message. ───────────────────────────────────────── GETTING STARTED — FACEBOOK MESSENGER ───────────────────────────────────────── Install the Euvoli extension Open Facebook Messenger Click the 🎵 button in the message toolbar Type your message and passphrase Click Encode & Insert Send your message normally Your recipient opens the message, clicks the three-dot menu, selects Decode Euvoli Message, enters the passphrase, and reads your message. ───────────────────────────────────────── ABOUT EUVOLI ───────────────────────────────────────── Euvoli is developed by QIZHONG LABS, a California sole proprietorship. The Melography protocol is designed to provide genuine communication privacy for journalists, activists, and privacy-conscious individuals worldwide. Web app: https://euvoli.qizhonglabs.com Privacy policy: https://euvoli.qizhonglabs.com/privacy ───────────────────────────────────────── Euvoli — Because privacy shouldn't look like a secret.