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suricata/doc/userguide/rules/ja3-keywords.rst

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JA3 Keywords
============
Suricata comes with a JA3 integration (https://github.com/salesforce/ja3). JA3 is used to fingerprint TLS clients.
JA3 must be enabled in the Suricata config file (set 'app-layer.protocols.tls.ja3-fingerprints' to 'yes').
ja3_hash
--------
Match on JA3 hash (md5).
Example::
alert tls any any -> any any (msg:"match JA3 hash"; \
ja3_hash; content:"e7eca2baf4458d095b7f45da28c16c34"; \
sid:100001;)
``ja3_hash`` is a 'Sticky buffer'.
``ja3_hash`` can be used as ``fast_pattern``.