352 lines
18 KiB
HTML
352 lines
18 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> — Hide messages or any file type (PDF, ZIP, documents)
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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> — Combines photo + phrase + PIN/RSA key
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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> — Military-grade authenticated encryption
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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> — Different passphrase each day of the week
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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>Random Pixel Embedding</strong> — Defeats statistical steganalysis
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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>Format Preservation</strong> — Maintains PNG/BMP lossless formats
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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> — Up to {{ max_payload_kb }} KB payload, 16MP images
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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> — Nothing saved, files auto-expire
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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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<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.
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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 Technique</h6>
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<p>
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Uses <strong>LSB (Least Significant Bit)</strong> 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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</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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<span class="badge bg-info me-1">New in v2.1</span>
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Stegasoo now 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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A 16MP carrier image can hold approximately 6MB of raw data, but we limit payloads
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to {{ max_payload_kb }} KB for reasonable processing times.
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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-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 or File
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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>Upload your <strong>reference photo</strong></li>
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<li>Upload a <strong>carrier image</strong> (the image to hide data in)</li>
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<li>Choose <strong>Text</strong> or <strong>File</strong> mode</li>
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<li>Enter your message or select a file to embed</li>
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<li>Enter <strong>today's phrase</strong> and your PIN/key</li>
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<li>Download the resulting stego image</li>
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<li>Send the stego image through any channel (email, social media, etc.)</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="#decoding">
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<i class="bi bi-3-circle me-2"></i>Decoding a Message or File
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</button>
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</h2>
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<div id="decoding" 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="/decode">Decode</a></li>
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<li>Upload your <strong>reference photo</strong> (same one used for encoding)</li>
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<li>Upload the <strong>stego image</strong> you received</li>
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<li>Enter the phrase for <strong>the day it was encoded</strong> (check the filename for date)</li>
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<li>Enter your PIN and/or RSA key</li>
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<li>View the decoded message or download the extracted file</li>
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</ol>
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<div class="alert alert-warning small mt-3 mb-0">
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<i class="bi bi-exclamation-triangle me-2"></i>
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The stego image filename contains the encoding date (e.g., <code>abc123_20251228.png</code>).
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Use this to determine which day's phrase to use!
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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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</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-speedometer2 me-2"></i>Limits & Specifications</h5>
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</div>
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<div class="card-body">
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<table class="table table-dark table-striped">
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<tbody>
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<tr>
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<td><i class="bi bi-file-text me-2"></i>Max text message</td>
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<td><strong>250,000 characters</strong> (~250 KB)</td>
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</tr>
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<tr>
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<td><i class="bi bi-file-earmark me-2"></i>Max file payload</td>
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<td><strong>{{ max_payload_kb }} KB</strong></td>
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</tr>
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<tr>
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<td><i class="bi bi-image me-2"></i>Max carrier image</td>
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<td><strong>16 megapixels</strong> (~4000×4000)</td>
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</tr>
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<tr>
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<td><i class="bi bi-upload me-2"></i>Max upload size</td>
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<td><strong>10 MB</strong></td>
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</tr>
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<tr>
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<td><i class="bi bi-clock me-2"></i>Temp file expiry</td>
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<td><strong>5 minutes</strong></td>
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</tr>
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<tr>
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<td><i class="bi bi-key me-2"></i>PIN length</td>
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<td><strong>6-9 digits</strong></td>
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</tr>
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<tr>
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<td><i class="bi bi-shield me-2"></i>RSA key sizes</td>
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<td><strong>2048, 3072, 4096 bits</strong></td>
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</tr>
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<tr>
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<td><i class="bi bi-chat-quote me-2"></i>Phrase length</td>
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<td><strong>3-12 words</strong> (BIP-39 wordlist)</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>
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<div class="card">
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<div class="card-header">
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<h5 class="mb-0"><i class="bi bi-terminal me-2"></i>CLI & API</h5>
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</div>
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<div class="card-body">
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<p>Stegasoo is also available as a command-line tool and REST API:</p>
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<h6 class="mt-3">Command Line</h6>
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<pre class="bg-dark p-3 rounded"><code># Generate credentials
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stegasoo generate --pin --rsa
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# Encode a text message
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stegasoo encode -r photo.jpg -c meme.png -p "apple forest thunder" --pin 123456 -m "secret"
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# Encode a file
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stegasoo encode -r photo.jpg -c meme.png -p "apple forest thunder" --pin 123456 -e document.pdf
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# Decode (auto-detects text vs file)
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stegasoo decode -r photo.jpg -s stego.png -p "apple forest thunder" --pin 123456</code></pre>
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<h6 class="mt-4">REST API</h6>
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<pre class="bg-dark p-3 rounded"><code># Encode with multipart upload
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curl -X POST http://localhost:8000/encode/multipart \
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-F "reference_photo=@photo.jpg" \
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-F "carrier=@meme.png" \
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-F "message=secret" \
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-F "day_phrase=apple forest thunder" \
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-F "pin=123456" \
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--output stego.png
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# Encode a file
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curl -X POST http://localhost:8000/encode/multipart \
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-F "reference_photo=@photo.jpg" \
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-F "carrier=@meme.png" \
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-F "payload_file=@document.pdf" \
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-F "day_phrase=apple forest thunder" \
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-F "pin=123456" \
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--output stego.png</code></pre>
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<p class="small text-muted mt-3 mb-0">
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API documentation available at <code>/docs</code> (Swagger) or <code>/redoc</code> when running the API server.
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</p>
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</div>
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</div>
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<div class="text-center mt-4 text-muted small">
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<p>
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Stegasoo v2.1.0 •
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<i class="bi bi-github me-1"></i>Open Source •
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Built with Python, Flask, and cryptography
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</p>
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</div>
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</div>
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</div>
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{% endblock %}
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