<ul data-eligibleForWebStory="true"><li>JA3 is a method to create a unique fingerprint of how a client behaves at the TLS level by encoding raw data and hashing it using MD5.</li><li>It is useful for bot and malware detection, application fingerprinting, and fraud analytics by distinguishing TLS handshakes and behaviors.</li><li>JA3 serializes fields into a comma-separated string and produces a unique hash representing the client's TLS negotiation process.</li><li>Cloudflare WAF uses JA3 to protect sensitive API endpoints with multiple filters.</li></ul>

What Is JA3? The Silent Fingerprint Behind Every HTTPS Connection

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