532 lines
29 KiB
HTML
532 lines
29 KiB
HTML
{% extends "base.html" %}
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{% block title %}About - Stegasoo{% endblock %}
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{% block content %}
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<div class="row justify-content-center">
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<div class="col-lg-10">
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<div class="card mb-4">
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<div class="card-header">
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<h5 class="mb-0"><i class="bi bi-info-circle me-2"></i>About Stegasoo</h5>
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</div>
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<div class="card-body">
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<p class="lead">
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Stegasoo is a secure steganography tool that hides encrypted messages and files
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inside ordinary images using multi-factor authentication.
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</p>
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<h6 class="text-primary mt-4 mb-3"><i class="bi bi-stars me-2"></i>Key Features</h6>
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<div class="row">
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<div class="col-md-6">
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<ul class="list-unstyled">
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>Text & File Embedding</strong>
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<br><small class="text-muted">Hide messages or any file type (PDF, ZIP, documents)</small>
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</li>
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>Multi-Factor Security</strong>
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<br><small class="text-muted">Combines photo + phrase + PIN/RSA key</small>
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</li>
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>AES-256-GCM Encryption</strong>
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<br><small class="text-muted">Military-grade authenticated encryption</small>
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</li>
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>Daily Rotating Phrases</strong>
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<br><small class="text-muted">Different passphrase each day of the week</small>
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</li>
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</ul>
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</div>
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<div class="col-md-6">
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<ul class="list-unstyled">
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>DCT Mode</strong>
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<span class="badge bg-warning text-dark ms-1">v3.0</span>
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<br><small class="text-muted">Survives JPEG recompression for social media</small>
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</li>
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>Random Pixel Embedding</strong>
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<br><small class="text-muted">Defeats statistical steganalysis</small>
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</li>
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>Large Capacity</strong>
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<br><small class="text-muted">Up to {{ max_payload_kb }} KB payload, 24MP images</small>
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</li>
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<li class="mb-2">
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<i class="bi bi-check-circle text-success me-2"></i>
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<strong>Zero Server Storage</strong>
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<br><small class="text-muted">Nothing saved, files auto-expire</small>
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</li>
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</ul>
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</div>
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</div>
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</div>
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</div>
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<!-- Embedding Modes - NEW SECTION -->
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<div class="card mb-4">
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<div class="card-header">
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<h5 class="mb-0"><i class="bi bi-cpu me-2"></i>Embedding Modes</h5>
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</div>
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<div class="card-body">
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<p>
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<span class="badge bg-warning text-dark me-1">New in v3.0</span>
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Stegasoo now supports two embedding modes, each optimized for different use cases.
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</p>
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<div class="row mt-4">
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<!-- LSB Mode -->
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<div class="col-md-6 mb-4">
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<div class="card bg-dark h-100">
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<div class="card-header">
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<i class="bi bi-grid-3x3-gap text-primary me-2"></i>
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<strong>LSB Mode</strong>
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<span class="badge bg-success ms-2">Default</span>
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</div>
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<div class="card-body">
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<p class="small">
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<strong>LSB (Least Significant Bit)</strong> embeds data in the lowest bit
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of each color channel. Changing the LSB changes pixel values by at most 1,
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which is imperceptible to the human eye.
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</p>
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<ul class="small mb-0">
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<li><strong>Capacity:</strong> ~375 KB per megapixel</li>
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<li><strong>Output:</strong> PNG (lossless)</li>
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<li><strong>Color:</strong> Full color preserved</li>
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<li><strong>Speed:</strong> Fast (~0.5s)</li>
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</ul>
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<hr>
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<div class="small">
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<i class="bi bi-check-circle text-success me-1"></i> Email attachments<br>
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<i class="bi bi-check-circle text-success me-1"></i> Cloud storage (Dropbox, Drive)<br>
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<i class="bi bi-check-circle text-success me-1"></i> Direct file transfer<br>
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<i class="bi bi-x-circle text-danger me-1"></i> Social media (recompresses)
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</div>
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</div>
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</div>
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</div>
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<!-- DCT Mode -->
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<div class="col-md-6 mb-4">
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<div class="card bg-dark h-100">
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<div class="card-header">
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<i class="bi bi-soundwave text-warning me-2"></i>
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<strong>DCT Mode</strong>
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<span class="badge bg-warning text-dark ms-2">v3.0</span>
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</div>
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<div class="card-body">
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<p class="small">
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<strong>DCT (Discrete Cosine Transform)</strong> embeds data in frequency
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coefficients rather than raw pixels. This survives JPEG recompression
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because coefficients are preserved during re-encoding.
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</p>
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<ul class="small mb-0">
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<li><strong>Capacity:</strong> ~75 KB per megapixel</li>
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<li><strong>Output:</strong> JPEG or PNG</li>
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<li><strong>Color:</strong> Color or grayscale</li>
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<li><strong>Speed:</strong> Slower (~2s)</li>
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</ul>
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<hr>
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<div class="small">
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<i class="bi bi-check-circle text-success me-1"></i> Instagram, Facebook<br>
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<i class="bi bi-check-circle text-success me-1"></i> WhatsApp, Signal, Telegram<br>
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<i class="bi bi-check-circle text-success me-1"></i> Twitter/X<br>
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<i class="bi bi-check-circle text-success me-1"></i> Any platform that recompresses
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</div>
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</div>
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</div>
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</div>
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</div>
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<!-- Mode Comparison Table -->
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<h6 class="mt-3"><i class="bi bi-table me-2"></i>Comparison</h6>
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<div class="table-responsive">
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<table class="table table-dark table-sm small">
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<thead>
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<tr>
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<th>Aspect</th>
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<th>LSB Mode</th>
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<th>DCT Mode</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Capacity (1080p)</td>
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<td class="text-success">~770 KB</td>
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<td class="text-warning">~50 KB</td>
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</tr>
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<tr>
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<td>Survives JPEG</td>
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<td class="text-danger">❌ No</td>
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<td class="text-success">✅ Yes</td>
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</tr>
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<tr>
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<td>Social Media</td>
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<td class="text-danger">❌ Broken</td>
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<td class="text-success">✅ Works</td>
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</tr>
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<tr>
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<td>Detection Resistance</td>
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<td>Moderate</td>
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<td>Better</td>
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</tr>
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<tr>
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<td>Dependencies</td>
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<td>Pillow, NumPy</td>
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<td>+ scipy, jpegio</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="alert alert-info small mt-3 mb-0">
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<i class="bi bi-lightbulb me-2"></i>
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<strong>Auto-Detection:</strong> When decoding, Stegasoo automatically detects whether
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LSB or DCT mode was used. You don't need to specify the mode during decoding.
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</div>
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</div>
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</div>
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<div class="card mb-4">
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<div class="card-header">
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<h5 class="mb-0"><i class="bi bi-shield-lock me-2"></i>How Security Works</h5>
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</div>
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<div class="card-body">
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<p>Stegasoo uses <strong>hybrid multi-factor authentication</strong> to derive encryption keys:</p>
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<div class="row text-center my-4">
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<div class="col-md-3 mb-3">
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<div class="p-3 bg-dark rounded">
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<i class="bi bi-image text-info fs-2 d-block mb-2"></i>
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<strong>Reference Photo</strong>
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<div class="small text-muted mt-1">Something you have</div>
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<div class="small text-success">~80-256 bits</div>
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</div>
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</div>
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<div class="col-md-3 mb-3">
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<div class="p-3 bg-dark rounded">
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<i class="bi bi-chat-quote text-warning fs-2 d-block mb-2"></i>
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<strong>Daily Phrase</strong>
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<div class="small text-muted mt-1">Something you know (rotates)</div>
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<div class="small text-success">~33 bits (3 words)</div>
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</div>
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</div>
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<div class="col-md-3 mb-3">
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<div class="p-3 bg-dark rounded">
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<i class="bi bi-123 text-danger fs-2 d-block mb-2"></i>
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<strong>Static PIN</strong>
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<div class="small text-muted mt-1">Something you know (fixed)</div>
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<div class="small text-success">~20 bits (6 digits)</div>
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</div>
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</div>
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<div class="col-md-3 mb-3">
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<div class="p-3 bg-dark rounded">
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<i class="bi bi-key text-primary fs-2 d-block mb-2"></i>
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<strong>RSA Key</strong>
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<div class="small text-muted mt-1">Something you have (optional)</div>
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<div class="small text-success">~128 bits (2048-bit)</div>
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</div>
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</div>
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</div>
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<div class="alert alert-secondary">
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<i class="bi bi-calculator me-2"></i>
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<strong>Combined entropy:</strong> 130-400+ bits depending on configuration.
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For reference, 128 bits is considered computationally infeasible to brute force.
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</div>
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<h6 class="mt-4">Key Derivation</h6>
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<p>
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{% if has_argon2 %}
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<span class="badge bg-success me-1"><i class="bi bi-check"></i> Argon2id Available</span>
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Using <strong>Argon2id</strong> with 256MB memory cost — the winner of the Password Hashing Competition
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and current best practice for key derivation. This makes GPU/ASIC attacks infeasible.
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{% else %}
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<span class="badge bg-warning text-dark me-1"><i class="bi bi-exclamation-triangle"></i> Argon2 Not Available</span>
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Falling back to <strong>PBKDF2-SHA512</strong> with 600,000 iterations.
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Install <code>argon2-cffi</code> for stronger security.
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{% endif %}
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</p>
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<h6 class="mt-4">Steganography Techniques</h6>
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<p>
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<strong>LSB Mode:</strong> Uses Least Significant Bit embedding with pseudo-random pixel selection.
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The pixel locations are determined by a key derived from your credentials, making the
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hidden data's location unpredictable without the correct inputs.
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</p>
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<p>
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<strong>DCT Mode:</strong> Uses Discrete Cosine Transform embedding with Quantization Index Modulation (QIM).
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Data is hidden in mid-frequency coefficients of 8×8 blocks, making it resilient to JPEG recompression.
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{% if has_dct %}
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<span class="badge bg-success"><i class="bi bi-check"></i> DCT Available</span>
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{% else %}
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<span class="badge bg-secondary">DCT Requires scipy</span>
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{% endif %}
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</p>
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</div>
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</div>
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<div class="card mb-4">
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<div class="card-header">
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<h5 class="mb-0"><i class="bi bi-file-earmark-binary me-2"></i>File Embedding</h5>
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</div>
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<div class="card-body">
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<p>
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Stegasoo supports embedding <strong>any file type</strong>, not just text messages.
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</p>
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<div class="row">
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<div class="col-md-6">
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<h6><i class="bi bi-check2-square text-success me-2"></i>Supported</h6>
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<ul class="small">
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<li>PDF documents</li>
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<li>ZIP/RAR archives</li>
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<li>Office documents (DOCX, XLSX, PPTX)</li>
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<li>Source code files</li>
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<li>Any binary file up to {{ max_payload_kb }} KB</li>
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</ul>
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</div>
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<div class="col-md-6">
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<h6><i class="bi bi-info-circle text-info me-2"></i>How It Works</h6>
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<ul class="small">
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<li>Original filename is preserved</li>
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<li>MIME type is stored for proper handling</li>
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<li>File is encrypted identically to text</li>
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<li>Decoding auto-detects text vs. file</li>
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</ul>
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</div>
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</div>
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<div class="alert alert-info small mt-3">
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<i class="bi bi-lightbulb me-2"></i>
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<strong>Tip:</strong> For larger files, compress them first (ZIP) to maximize capacity.
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Note that DCT mode has ~10× less capacity than LSB mode.
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</div>
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</div>
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</div>
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<!-- REST API Card -->
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<div class="card mb-4">
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<div class="card-header">
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<h5 class="mb-0"><i class="bi bi-braces me-2"></i>REST API</h5>
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</div>
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<div class="card-body">
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<p>
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<span class="badge bg-success me-1"><i class="bi bi-check-circle"></i> FastAPI</span>
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Stegasoo includes a complete REST API with automatic documentation and type validation.
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</p>
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<h6 class="mt-4"><i class="bi bi-layers me-2"></i>Endpoints</h6>
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<div class="row">
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<div class="col-md-6">
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<ul class="small">
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<li><code>POST /generate</code> – Generate credentials</li>
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<li><code>POST /encode</code> – Encode text (JSON)</li>
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<li><code>POST /encode/multipart</code> – Encode with uploads</li>
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<li><code>POST /decode</code> – Decode message (JSON)</li>
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<li><code>POST /decode/multipart</code> – Decode with uploads</li>
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</ul>
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</div>
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<div class="col-md-6">
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<ul class="small">
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<li><code>POST /image/info</code> – Get image capacity</li>
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<li><code>POST /extract-key-from-qr</code> – Extract RSA from QR</li>
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<li><code>GET /</code> – API status and capabilities</li>
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<li><code>GET /docs</code> – Swagger documentation</li>
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<li><code>GET /redoc</code> – ReDoc documentation</li>
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</ul>
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</div>
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</div>
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<h6 class="mt-4"><i class="bi bi-code-slash me-2"></i>Example: DCT Encode</h6>
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<pre class="bg-dark p-3 rounded small"><code># Encode with DCT mode for social media
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curl -X POST "http://localhost:8000/encode/multipart" \
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-F "day_phrase=apple forest thunder" \
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-F "pin=123456" \
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-F "embedding_mode=dct" \
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-F "output_format=jpeg" \
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-F "reference_photo=@photo.jpg" \
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-F "carrier=@meme.png" \
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-F "message=secret message" \
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--output stego.jpg</code></pre>
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<h6 class="mt-4"><i class="bi bi-terminal me-2"></i>Command Line</h6>
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<pre class="bg-dark p-3 rounded small"><code># Generate credentials
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stegasoo generate --pin --words 3
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# Encode with LSB (default)
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stegasoo encode -r photo.jpg -c meme.png -p "phrase" --pin 123456 -m "secret"
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# Encode with DCT for social media
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stegasoo encode -r photo.jpg -c meme.png -p "phrase" --pin 123456 -m "secret" \
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--mode dct --format jpeg
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# Decode (auto-detects mode)
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stegasoo decode -r photo.jpg -s stego.png -p "phrase" --pin 123456</code></pre>
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<p class="small text-muted mt-3 mb-0">
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<span class="badge bg-{% if has_argon2 %}success{% else %}warning{% endif %} me-1">
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{% if has_argon2 %}Argon2{% else %}PBKDF2{% endif %}
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</span>
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<span class="badge bg-{% if has_dct %}success{% else %}secondary{% endif %} me-1">
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{% if has_dct %}DCT Available{% else %}DCT Unavailable{% endif %}
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</span>
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<span class="badge bg-{% if has_qrcode_read %}success{% else %}secondary{% endif %}">
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{% if has_qrcode_read %}QR Reading{% else %}No QR Reading{% endif %}
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</span>
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</p>
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</div>
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</div>
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<div class="card mb-4">
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<div class="card-header">
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<h5 class="mb-0"><i class="bi bi-question-circle me-2"></i>Usage Guide</h5>
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</div>
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<div class="card-body">
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<div class="accordion" id="usageAccordion">
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<div class="accordion-item bg-dark">
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<h2 class="accordion-header">
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<button class="accordion-button bg-dark text-light" type="button"
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data-bs-toggle="collapse" data-bs-target="#setup">
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<i class="bi bi-1-circle me-2"></i>Initial Setup
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</button>
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</h2>
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<div id="setup" class="accordion-collapse collapse show" data-bs-parent="#usageAccordion">
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<div class="accordion-body">
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<ol>
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<li>Both parties agree on a <strong>reference photo</strong> (shared secretly, never transmitted)</li>
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<li>Go to <a href="/generate">Generate</a> and create credentials</li>
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<li><strong>Memorize</strong> the 7 daily phrases and PIN</li>
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<li>If using RSA, download and securely store the key file</li>
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<li>Share credentials with your contact through a secure channel</li>
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</ol>
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</div>
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</div>
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</div>
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<div class="accordion-item bg-dark">
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<h2 class="accordion-header">
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<button class="accordion-button collapsed bg-dark text-light" type="button"
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data-bs-toggle="collapse" data-bs-target="#encoding">
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<i class="bi bi-2-circle me-2"></i>Encoding a Message
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</button>
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</h2>
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<div id="encoding" class="accordion-collapse collapse" data-bs-parent="#usageAccordion">
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<div class="accordion-body">
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<ol>
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<li>Go to <a href="/encode">Encode</a></li>
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<li>Choose your <strong>embedding mode</strong>:
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<ul>
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<li><strong>LSB</strong> – for email, cloud storage, direct transfer</li>
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<li><strong>DCT</strong> – for social media (Instagram, WhatsApp, etc.)</li>
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</ul>
|
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</li>
|
||
<li>Upload your <strong>reference photo</strong> and <strong>carrier image</strong></li>
|
||
<li>Enter your message or select a file to embed</li>
|
||
<li>Enter <strong>today's phrase</strong> and your PIN/key</li>
|
||
<li>Download the resulting stego image</li>
|
||
<li>Send through any channel!</li>
|
||
</ol>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="accordion-item bg-dark">
|
||
<h2 class="accordion-header">
|
||
<button class="accordion-button collapsed bg-dark text-light" type="button"
|
||
data-bs-toggle="collapse" data-bs-target="#decoding">
|
||
<i class="bi bi-3-circle me-2"></i>Decoding a Message
|
||
</button>
|
||
</h2>
|
||
<div id="decoding" class="accordion-collapse collapse" data-bs-parent="#usageAccordion">
|
||
<div class="accordion-body">
|
||
<ol>
|
||
<li>Go to <a href="/decode">Decode</a></li>
|
||
<li>Upload your <strong>reference photo</strong> (same one used for encoding)</li>
|
||
<li>Upload the <strong>stego image</strong> you received</li>
|
||
<li>Enter the phrase for <strong>the day it was encoded</strong></li>
|
||
<li>Enter your PIN and/or RSA key</li>
|
||
<li>View the decoded message or download the extracted file</li>
|
||
</ol>
|
||
<div class="alert alert-info small mt-3 mb-0">
|
||
<i class="bi bi-magic me-2"></i>
|
||
<strong>Auto-detection:</strong> Stegasoo automatically detects LSB vs DCT mode.
|
||
The filename contains the encoding date (e.g., <code>abc123_20251231.png</code>).
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="card">
|
||
<div class="card-header">
|
||
<h5 class="mb-0"><i class="bi bi-speedometer2 me-2"></i>Limits & Specifications</h5>
|
||
</div>
|
||
<div class="card-body">
|
||
<table class="table table-dark table-striped small">
|
||
<tbody>
|
||
<tr>
|
||
<td><i class="bi bi-file-text me-2"></i>Max text message</td>
|
||
<td><strong>2 million characters</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-file-earmark me-2"></i>Max file payload</td>
|
||
<td><strong>{{ max_payload_kb }} KB</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-image me-2"></i>Max carrier image</td>
|
||
<td><strong>24 megapixels</strong> (~6000×4000)</td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-grid-3x3 me-2"></i>LSB capacity</td>
|
||
<td><strong>~375 KB/megapixel</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-soundwave me-2"></i>DCT capacity</td>
|
||
<td><strong>~75 KB/megapixel</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-upload me-2"></i>Max upload size</td>
|
||
<td><strong>30 MB</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-clock me-2"></i>Temp file expiry</td>
|
||
<td><strong>5 minutes</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-key me-2"></i>PIN length</td>
|
||
<td><strong>6-9 digits</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-shield me-2"></i>RSA key sizes</td>
|
||
<td><strong>2048, 3072, 4096 bits</strong></td>
|
||
</tr>
|
||
<tr>
|
||
<td><i class="bi bi-chat-quote me-2"></i>Phrase length</td>
|
||
<td><strong>3-12 words</strong> (BIP-39)</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="text-center mt-4 text-muted small">
|
||
<p>
|
||
Stegasoo v{{ version }} •
|
||
<i class="bi bi-github me-1"></i>Open Source •
|
||
Built with Python, Flask/FastAPI, and cryptography
|
||
</p>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
{% endblock %}
|