HTTP client fingerprinting using SSL handshake analysis
A cipher suite, in SSL, is a collection of cryptographic techniques that defines a secure communication channel. There are hundreds of cipher suites, and they are all built out of a dozen or so basic building blocks: key exchange, encryption and integrity validation algorithms. Different programs often use different cipher suites. By observing the list of supported cipher suites one can determine the maximal communication strength, and often even guess the make of the SSL client on the other side.
At SSL labs.
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