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by martinprins
147 days ago
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Author here. Started with a simple problem: sync data between two phones with no backend. WebRTC signaling SDPs are ~2.5KB. Too large for practical QR scanning. When you control both endpoints, most of that is unnecessary ceremony. Key insights: derive ICE credentials from DTLS fingerprint via HKDF, use binary encoding (IP as 4 bytes not ASCII), skip compression (DEFLATE increases size on high-entropy data), skip base64 (QR supports raw binary). |
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