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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Ping - Decentralized E2E Encrypted Messenger</title>
<style>
:root {
--bg-primary: #0d1117;
--bg-secondary: #161b22;
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--text-muted: #6e7681;
--accent-blue: #90FE8E; /* #58a6ff */
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--accent-purple: #a371f7;
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--border-color: #30363d;
--code-bg: #1a1f26;
}
* {
margin: 0;
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body {
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/* Header */
.header {
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.header h1 {
font-size: 2.5em;
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/* Screenshot placeholder */
.screenshot-placeholder {
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border: 2px dashed var(--border-color);
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padding: 60px 20px;
text-align: center;
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/* Sections */
section {
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h2 {
font-size: 1.8em;
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h3 {
font-size: 1.3em;
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h3 .emoji {
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p {
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/* Feature Grid */
.feature-grid {
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.feature-card h3 {
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.feature-card li:last-child {
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.feature-card li strong {
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/* Tables */
table {
width: 100%;
border-collapse: collapse;
margin: 20px 0;
background: var(--bg-secondary);
border-radius: 10px;
overflow: hidden;
}
th, td {
padding: 12px 15px;
text-align: left;
border-bottom: 1px solid var(--border-color);
}
th {
background: var(--bg-tertiary);
color: var(--text-primary);
font-weight: 600;
}
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color: var(--text-secondary);
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tr:last-child td {
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tr:hover {
background: var(--bg-tertiary);
}
/* Code blocks */
pre {
background: var(--code-bg);
border: 1px solid var(--border-color);
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overflow-x: auto;
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}
code {
font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
font-size: 0.9em;
color: var(--accent-green);
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pre code {
color: var(--text-primary);
}
.comment {
color: var(--text-muted);
}
/* Inline code */
p code, td code, li code {
background: var(--bg-tertiary);
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font-size: 0.85em;
}
/* Alerts/Notes */
.note {
background: rgba(56, 139, 253, 0.1);
border: 1px solid rgba(56, 139, 253, 0.4);
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.note strong {
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.warning {
background: rgba(210, 153, 34, 0.1);
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border-radius: 8px;
padding: 15px 20px;
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}
.warning strong {
color: var(--accent-orange);
}
/* Diagram */
.diagram {
background: var(--bg-secondary);
border: 1px solid var(--border-color);
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margin: 20px 0;
font-family: 'SF Mono', 'Fira Code', monospace;
font-size: 0.85em;
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white-space: pre;
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/* Command reference table */
.command-table td:first-child {
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.command-table code {
color: var(--accent-green);
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/* Footer */
.footer {
text-align: center;
padding: 40px 0;
border-top: 1px solid var(--border-color);
margin-top: 50px;
}
.footer-links {
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}
.footer-links a {
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.footer-links a:hover {
text-decoration: underline;
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.footer-sub {
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/* Responsive */
@media (max-width: 600px) {
body {
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.header h1 {
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.feature-grid {
grid-template-columns: 1fr;
}
table {
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pre {
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}
/* Links */
a {
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a:hover {
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/* Lists */
ul, ol {
margin: 15px 0;
padding-left: 25px;
color: var(--text-secondary);
}
li {
margin-bottom: 8px;
}
/* Horizontal rule */
hr {
border: none;
border-top: 1px solid var(--border-color);
margin: 40px 0;
}
/* Table of Contents */
.toc {
background: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: 10px;
padding: 25px 30px;
margin: 30px 0;
}
.toc h3 {
margin-bottom: 15px;
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.toc-grid {
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.toc a:hover {
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.toc a .emoji {
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/* Message Flow Steps */
.flow-step {
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border-left: 3px solid var(--accent-blue);
padding: 15px 20px;
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.flow-step p {
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/* Algorithm Summary */
.algo-grid {
display: grid;
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.algo-card {
background: var(--bg-secondary);
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border-radius: 8px;
padding: 15px 20px;
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.algo-card h4 {
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.algo-card code {
color: var(--text-primary);
font-size: 1em;
}
</style>
</head>
<body>
<!-- Header -->
<header class="header">
<h1><span class="emoji">🏓</span>Ping</h1>
<p class="tagline">Decentralized End-to-End Encrypted Messenger</p>
<div class="badges">
<span class="badge badge-blue">Python 3.12+</span>
<span class="badge badge-purple">ANSI Terminal</span>
<span class="badge badge-green">E2E Encrypted</span>
<span class="badge badge-orange">Nostr Relays</span>
</div>
<p class="subtitle">Serverless, Trustless, Attacless Private Messaging.</p>
<!-- Screenshot placeholder -->
<div class="screenshot-placeholder">
📸 Screenshot placeholder — Add demo.png here
</div>
</header>
<!-- Table of Contents -->
<nav class="toc">
<h3>📑 Table of Contents</h3>
<div class="toc-grid">
<a href="#features"><span class="emoji">✨</span>Features</a>
<a href="#security"><span class="emoji">🛡️</span>Security</a>
<a href="#installation"><span class="emoji">📦</span>Installation</a>
<a href="#usage"><span class="emoji">🚀</span>Usage</a>
<a href="#themes"><span class="emoji">🎨</span>Themes</a>
<a href="#identity"><span class="emoji">💾</span>Identity Management</a>
<a href="#updates"><span class="emoji">🔄</span>Updates</a>
<a href="#mobile"><span class="emoji">📱</span>Mobile Usage</a>
<a href="#how-it-works"><span class="emoji">🌐</span>How It Works</a>
<a href="#contributing"><span class="emoji">🤝</span>Contributing</a>
<a href="#license"><span class="emoji">📄</span>License</a>
<a href="#acknowledgments"><span class="emoji">🙏</span>Acknowledgments</a>
</div>
</nav>
<!-- Features -->
<section id="features">
<h2><span class="emoji">✨</span>Features</h2>
<div class="feature-grid">
<div class="feature-card">
<h3>🔒 Privacy First</h3>
<ul>
<li><strong>End-to-end encryption</strong> with X25519 + ChaCha20-Poly1305</li>
<li><strong>Ephemeral chat sessions</strong> new keys each session by default</li>
<li><strong>No accounts</strong> no email, no phone, no registration</li>
<li><strong>No metadata</strong> encrypted envelopes hide message patterns</li>
</ul>
</div>
<div class="feature-card">
<h3>🌐 Truly Decentralized</h3>
<ul>
<li><strong>Nostr protocol</strong> censorship-resistant relay network</li>
<li><strong>No central server</strong> messages route through public relays</li>
<li><strong>Works offline-first</strong> reconnects automatically</li>
<li><strong>Self-hosted option</strong> run your own relay</li>
</ul>
</div>
<div class="feature-card">
<h3>💬 Features</h3>
<ul>
<li><strong>Room based</strong> group chats</li>
<li><strong>Direct messages</strong> between peers</li>
<li><strong>Password-protected</strong> rooms</li>
<li><strong>Invite codes</strong> with QR generation</li>
<li><strong>Sound notifications</strong> with mention detection</li>
</ul>
</div>
<div class="feature-card">
<h3>🎨 Customizable</h3>
<ul>
<li><strong>20+ color themes</strong> (matrix, tron, amber, etc.)</li>
<li><strong>Custom colors</strong> set any bg/fg combination</li>
<li><strong>Portable</strong> single Python file, no install needed</li>
<li><strong>Cross-platform</strong> Linux, macOS, Windows, mobile</li>
</ul>
</div>
</div>
</section>
<hr>
<!-- Security -->
<section id="security">
<h2><span class="emoji">🛡️</span>Security</h2>
<p>Ping uses a modern cryptographic stack:</p>
<table>
<thead>
<tr>
<th>Layer</th>
<th>Algorithm</th>
<th>Purpose</th>
</tr>
</thead>
<tbody>
<tr>
<td>Key Exchange</td>
<td><strong>X25519 ECDH</strong></td>
<td>Derive shared secrets</td>
</tr>
<tr>
<td>Encryption</td>
<td><strong>ChaCha20-Poly1305</strong></td>
<td>Authenticated encryption</td>
</tr>
<tr>
<td>Key Derivation</td>
<td><strong>HKDF-SHA256</strong></td>
<td>Expand shared secret</td>
</tr>
<tr>
<td>Nostr Identity</td>
<td><strong>secp256k1 Schnorr</strong></td>
<td>Sign Nostr events</td>
</tr>
</tbody>
</table>
<h3>Privacy Modes</h3>
<table>
<thead>
<tr>
<th>Mode</th>
<th>Flag</th>
<th>Protection Level</th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Default</strong></td>
<td><code>—</code></td>
<td>Encrypted envelopes + ephemeral Nostr keys</td>
</tr>
<tr>
<td><strong>Hardened</strong></td>
<td><code>--hardened</code></td>
<td>Default + decoy traffic + timing jitter</td>
</tr>
<tr>
<td><strong>Legacy</strong></td>
<td><code>--legacy</code></td>
<td>E2E encryption only</td>
</tr>
</tbody>
</table>
</section>
<hr>
<!-- Installation -->
<section id="installation">
<h2><span class="emoji">📦</span>Installation</h2>
<h3>Prerequisites</h3>
<ul>
<li>Python 3.12 or higher</li>
<li>pip (Python package manager)</li>
</ul>
<h3>Quick Install</h3>
<pre><code><span class="comment"># Clone the repository</span>
git clone https://github.com/yourusername/ping-e2e.git
cd ping-e2e
<span class="comment"># Install dependencies</span>
pip install cryptography websockets certifi
<span class="comment"># Optional: faster crypto (recommended)</span>
pip install secp256k1
<span class="comment"># or</span>
pip install coincurve
<span class="comment"># Optional: QR code generation</span>
pip install qrcode</code></pre>
<h3>One-Line Install</h3>
<pre><code>curl -O https://raw.githubusercontent.com/attacless/ping/main/ping.py && pip install cryptography websockets certifi && python ping.py</code></pre>
<h3>Dependencies</h3>
<table>
<thead>
<tr>
<th>Package</th>
<th>Required</th>
<th>Purpose</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>cryptography</code></td>
<td>✅ Yes</td>
<td>X25519, ChaCha20-Poly1305, HKDF</td>
</tr>
<tr>
<td><code>websockets</code></td>
<td>✅ Yes</td>
<td>Nostr relay connections</td>
</tr>
<tr>
<td><code>certifi</code></td>
<td>✅ Yes</td>
<td>SSL certificates</td>
</tr>
<tr>
<td><code>secp256k1</code></td>
<td>⭐ Recommended</td>
<td>Fast Schnorr signatures</td>
</tr>
<tr>
<td><code>coincurve</code></td>
<td>🔄 Alternative</td>
<td>Schnorr signatures</td>
</tr>
<tr>
<td><code>qrcode</code></td>
<td>📱 Optional</td>
<td>QR invite codes</td>
</tr>
</tbody>
</table>
<div class="note">
<strong>Note:</strong> If neither <code>secp256k1</code> nor <code>coincurve</code> is installed, Ping falls back to a pure Python implementation (slower but works everywhere).
</div>
</section>
<hr>
<!-- Usage -->
<section id="usage">
<h2><span class="emoji">🚀</span>Usage</h2>
<h3>Basic Usage</h3>
<pre><code><span class="comment"># Start Ping (interactive mode)</span>
python ping.py
<span class="comment"># Join a room directly</span>
python ping.py -r myroom
<span class="comment"># Join a password-protected room</span>
python ping.py -r secretroom -p mypassword
<span class="comment"># Join via invite code</span>
python ping.py -i ping1eyJyIjoibXlyb29tIn0</code></pre>
<h3>Command Line Options</h3>
<pre><code>python ping.py [OPTIONS]
Options:
-r, --room ROOM Join a room on startup
-p, --password PASS Room password
-i, --invite CODE Join via invite code
-u, --username NAME Set your display name
-c, --color THEME Set color theme (e.g., matrix, tron)
-l, --load Load identity from pingconfig.json
--persist Persistent mode (save to ~/.ping-data)
--legacy Legacy mode (compatible with old clients)
--hardened Hardened privacy mode
--no-sound Disable sound notifications
--update Check for and install updates
-d, --debug Show debug output
-v, --version Show version</code></pre>
<h3>Chat Commands</h3>
<p>Once inside Ping, use these commands:</p>
<table class="command-table">
<thead>
<tr>
<th>Category</th>
<th>Command</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td rowspan="5"><strong>Room</strong></td>
<td><code>/join <room> [pass]</code></td>
<td>Join a room (with optional password)</td>
</tr>
<tr>
<td><code>/leave</code></td>
<td>Leave current room</td>
</tr>
<tr>
<td><code>/invite</code></td>
<td>Generate invite code + QR</td>
</tr>
<tr>
<td><code>/peers</code></td>
<td>Show connected peers</td>
</tr>
<tr>
<td><code>/reconnect</code></td>
<td>Reconnect to relays</td>
</tr>
<tr>
<td rowspan="2"><strong>Chat</strong></td>
<td><code>/dm <user> <msg></code></td>
<td>Send direct message</td>
</tr>
<tr>
<td><code>/name <username></code></td>
<td>Change display name</td>
</tr>
<tr>
<td rowspan="4"><strong>View</strong></td>
<td><code>/info</code></td>
<td>Show session info</td>
</tr>
<tr>
<td><code>/relays</code></td>
<td>Show relay status</td>
</tr>
<tr>
<td><code>/printsession</code></td>
<td>Show encryption keys</td>
</tr>
<tr>
<td><code>/clear</code></td>
<td>Clear screen</td>
</tr>
<tr>
<td rowspan="2"><strong>Config</strong></td>
<td><code>/color [theme]</code></td>
<td>Set colors (<code>/color themes</code> for list)</td>
</tr>
<tr>
<td><code>/sound [on|off]</code></td>
<td>Toggle sound notifications</td>
</tr>
<tr>
<td rowspan="4"><strong>Data</strong></td>
<td><code>/save</code></td>
<td>Export user session to pingconfig.json</td>
</tr>
<tr>
<td><code>/load</code></td>
<td>Import user session from pingconfig.json</td>
</tr>
<tr>
<td><code>/update</code></td>
<td>Check for updates</td>
</tr>
<tr>
<td><code>/wipe</code></td>
<td>Delete all local data</td>
</tr>
<tr>
<td><strong>Exit</strong></td>
<td><code>/quit</code></td>
<td>Exit Ping</td>
</tr>
</tbody>
</table>
</section>
<hr>
<!-- Themes -->
<section id="themes">
<h2><span class="emoji">🎨</span>Themes</h2>
<p>Ping includes 20+ built-in color themes:</p>
<pre><code><span class="comment"># Apply a theme</span>
/color matrix <span class="comment"># Green on black (hacker style)</span>
/color tron <span class="comment"># Cyan on black</span>
/color amber <span class="comment"># Yellow on black (CRT monitor)</span>
/color ocean <span class="comment"># Cyan on blue</span>
<span class="comment"># Custom colors</span>
/color blue white <span class="comment"># Blue background, white text</span>
/color - lgreen <span class="comment"># Keep background, light green text</span>
<span class="comment"># Reset to default</span>
/color reset</code></pre>
<!-- Theme screenshots placeholder -->
<div class="screenshot-placeholder">
📸 Theme screenshots placeholder — Add theme previews here
</div>
<p><strong>Available themes:</strong> <code>matrix</code>, <code>tron</code>, <code>classic</code>, <code>amber</code>, <code>light</code>, <code>ocean</code>, <code>sunset</code>, <code>grape</code>, <code>snow</code>, <code>midnight</code>, <code>coffee</code>, and more.</p>
</section>
<hr>
<!-- Session Management -->
<section id="identity">
<h2><span class="emoji">💾</span>Session Management</h2>
<p>By default, Ping runs in <strong>ephemeral mode</strong> a new keyset is generated each session for maximum privacy.</p>
<h3>Saving Your Keys</h3>
<pre><code><span class="comment"># Save current user session to pingconfig.json</span>
/save
<span class="comment"># Load user on next run</span>
python ping.py --load</code></pre>
<h3>Persistent Mode</h3>
<pre><code><span class="comment"># Always use the same user session (stored in ~/.ping-data)</span>
python ping.py --persist</code></pre>
<h3>Config File Format</h3>
<p>The <code>pingconfig.json</code> file contains your user session keys:</p>
<pre><code>{
"version": 1,
"identity": {
"nostr_private_key": "base64...",
"nostr_public_key": "hex...",
"npub": "npub1...",
"encryption_private_key": "base64...",
"encryption_public_key": "base64...",
"ping_id": "abcd1234",
"created_at": 1234567890
},
"username": "cosmic-wolf-123",
"exported_at": 1234567890
}</code></pre>
<div class="warning">
<strong>⚠️ Keep this file secure!</strong> Anyone with access to it can impersonate you.
</div>
</section>
<hr>
<!-- Updates -->
<section id="updates">
<h2><span class="emoji">🔄</span>Updates</h2>
<p>Ping can update itself:</p>
<pre><code><span class="comment"># From command line</span>
python ping.py --update
<span class="comment"># From within Ping</span>
/update</code></pre>
<p>After updating, you'll be prompted to restart automatically.</p>
</section>
<hr>
<!-- Mobile -->
<section id="mobile">
<h2><span class="emoji">📱</span>Ping on Mobile</h2>
<p>Ping works great on mobile terminal apps like <strong>Termux</strong> (Android) or <strong>a-Shell mini</strong> (iOS):</p>
<pre><code><span class="comment"># Install on Termux</span>
pkg install python
pip install cryptography websockets certifi
curl -O https://raw.githubusercontent.com/attacless/ping/main/ping.py
python ping.py</code></pre>
<div class="note">
<strong>Tip:</strong> Use <code>--no-sound</code> if terminal bells are annoying on mobile.
</div>
</section>
<hr>
<!-- How It Works -->
<section id="how-it-works">
<h2><span class="emoji">🌐</span>How It Works</h2>
<p>Ping uses the Nostr protocol for decentralized message relay, with end-to-end encryption ensuring only the intended recipients can read messages.</p>
<h3>Architecture Overview</h3>
<div class="diagram">┌─────────────┐ ┌─────────────┐ ┌─────────────┐
│ Alice │ │ Nostr │ │ Bob │
│ (ping.py) │────▶│ Relays │◀────│ (ping.py) │
└─────────────┘ └─────────────┘ └─────────────┘
│ │ │
│ 1. Key Exchange (signed, public) │
│◀─────────────────────────────────────▶│
│ │
│ 2. Encrypted Messages (E2E) │
│◀══════════════════════════════════════▶│
│ (Only Alice & Bob can decrypt) │</div>
<h3>Complete Message Flow</h3>
<p>When Alice sends a message to Bob, here's exactly what happens:</p>
<div class="flow-step">
<span class="flow-step-number">1</span>
<h4>Create Message Payload</h4>
<p>Alice's message is packaged with metadata: content, timestamp, username, and a unique ID.</p>
</div>
<div class="flow-step">
<span class="flow-step-number">2</span>
<h4>ECDH Key Agreement</h4>
<p>Alice combines her X25519 private key with Bob's public key to derive a shared secret. Bob can compute the same secret using his private key + Alice's public key.</p>
</div>
<div class="flow-step">
<span class="flow-step-number">3</span>
<h4>Key Derivation (HKDF)</h4>
<p>The shared secret is expanded using HKDF-SHA256 with the info string <code>ping-nostr-chacha20poly1305-v1</code> to produce the encryption key.</p>