[openssl-users] May I ask you about the master-key in openssl s_client command result?

이영주 shinejaekal at naver.com
Thu Sep 27 01:19:19 UTC 2018

Hello. I am a person working in Korea.
I have a question.
I wonder why master-key is revealed in plaintext in the results below.
(used command : Openssl s_client -connect host:port)
        Protocol : TLSv1.2
        Cipher : ECDHE-RSA-AES128-GCM-SHA256
        Session-ID : C3921E69...
        Master-Key : 6244A1C4B9D48A6C2100198...
Does it matter if the master key is exposed in plaintext?
And I wonder what role this master key plays.
Thank you for your detailed answer.
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