Technical Deep Dive · 8 min read
Attackers Randomize Their TLS Fingerprint. Here Is What Still Catches Them.
In one attack against our edge, 12,664 TLS handshakes produced 10,789 different JA3 fingerprints and only 11 JA4s. That gap explains why one fingerprint survived randomization and the other did not.
Sep 25, 2026