JA3 is a method to profile the way server and clients do their SSL/ TLS handshake. It has been created by Salesforce engineers, John B. Althouse, Jeff Atkinson and Josh Atkins. Many servers and clients use different tls configurations, making this a good way of identifying applications, libraries and their corresponding versions. Each tls configuration uses its own set of ciphers, extensions and elliptic curves. 

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