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Google's Merkle Tree Certificates Shrink HTTPS Certificates to 64 Bytes

Ars Technica •
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Merkle Tree Certificate support is already baked into Chrome, marking a significant leap in securing HTTPS connections. Google has demonstrated a revolutionary technique that compresses a 2.5-kilobyte certificate down to a mere 64 bytes, drastically reducing bandwidth and latency costs for websites. This innovation leverages cryptographic Merkle trees to verify certificate chains efficiently, making HTTPS verification faster and less resource-intensive without compromising security. The move underscores Google's push towards a more efficient and secure web infrastructure, directly benefiting both website operators and end-users by streamlining secure connections.

This technical advancement addresses a critical bottleneck in web security. Traditional certificate chains require substantial data transfer, slowing down page loads and increasing server load. By shrinking the certificate size by over 97%, Google's approach significantly lowers the barrier to implementing robust HTTPS, potentially accelerating widespread adoption across the internet. The technique's efficiency gains are particularly impactful for resource-constrained environments like mobile devices or low-bandwidth regions, where every byte counts. Chrome is leading this charge, with the feature already live, signaling a potential industry-wide shift towards more compact certificate verification.

While the core innovation is complex, its practical impact is straightforward: faster, cheaper, and more secure web browsing. Users won't see the technical details, but they will experience quicker page loads and potentially lower data usage when accessing sites secured with this new method. Google's integration into Chrome is the first major step; broader adoption by other browsers and certificate authorities will determine how quickly this efficiency becomes the new standard, fundamentally improving the speed and security of the internet for everyone.