transport layer security

JA3, JA3S, and JA4 Fingerprinting: How TLS Handshakes Get Hashed and Compared

April 2, 2026April 1, 2026 by Simon Dadia

Digital network with data streams representing TLS handshakes in dramatic lighting.

JA3 JA4 fingerprinting techniques extract TLS handshake parameters to identify browsers before JavaScript runs. Chrome’s extension randomization broke every JA3 system in 2019, forcing security teams to develop JA4 with normalized field ordering. Key Takeaways: JA3 creates MD5 hashes from 5 specific TLS handshake fields in their exact transmission order Chrome’s extension randomization generates different … Read more

TLS Fingerprinting: How the Transport Layer Identifies Your Browser Before JavaScript Runs

April 2, 2026April 1, 2026 by Simon Dadia

Digital handshake process visualizing TLS fingerprinting in a high-tech environment.

TLS fingerprinting explained is the process that happens while most people think browser fingerprinting occurs through JavaScript. Platforms actually identify your browser during the TLS handshake, before any JavaScript executes, before cookies load, and before any fingerprint-spoofing code can run. Key Takeaways: TLS fingerprinting identifies browsers in the first 200 milliseconds of connection, before JavaScript … Read more