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ConceptNSS Key Log

SSLKEYLOGFILE

An environment variable introduced by Mozilla NSS and supported by mainstream TLS implementations. When a client application detects this variable, it writes TLS session keys to a specified file. Tools such as Wireshark can use these keys to decrypt otherwise encrypted TLS traffic for analysis.

Timeline (last 90 days)

Sep 19

NetWatch supports decryption of TLS 1.3 and 1.2, provided that session keys are available, by pointing the client's SSLKEYLOGFILE to NetWatch, whereupon the plaintext is decoded in the Packets tab.

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Sep 19

SSLKEYLOGFILE is an environment variable first introduced by NSS and later widely supported by mainstream TLS implementations; when a client program detects this variable, it writes session keys to a file in NSS Key Log format after the TLS handshake.

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