![]() So, what works for RSA-based key exchanges, won't do for DHE-based ones. This is exactly what Wireshark is doing when decoding a TLS stream for you. Youd be the sole owner of that root cert / its private key. The certificate only holds the public key so it wouldnt be of much use to you. From an SSL/TLS perspective you could have an HTTPS proxy on your network proxying all your. If you dont control the webserver you shouldnt be able to obtain it. If an eavesdropping third party has the server's private key, it simply can decrypt the RSA ciphertext of the key exchange, get at the bulk cipher key and decrypt eveything else. The private key is private to the webserver. Wireshark provides another means for decrypting data as well by using the pre-master secret. This is different when solely relying on RSA for key exchange: in this operation mode, the bulk cipher key to be used is generated by the client, RSA-encrypted with the server's public key and sent to the server. The easiest way to decrypt data is to use the private key for the corresponding public key. that is supported by Wireshark in order to decrypt SSL/TLS connections even when you dont have the private key, or when using key exchange methods that. In other words, with (EC)DHE, the AES key used for encryption and decryption cannot be retrieved from the TLS ciphertext conversation, not even if you have the server's private key. And there is something special about the Diffie-Hellman key exchange used in ECDHE_RSA:ĭHE_RSA offers something known as Perfect Forward Secrecy, a pompous name for the following property: if your server gets thoroughly hacked, to the point that the attacker obtains a copy of the server private key, then he will also be able to decrypt past TLS sessions (which he recorded) if these sessions used RSA, while he will not be able to do so if these sessions used DHE_RSA. The protocol version is SSLv3, (D)TLS 1.0-1.2. Thirdly, a private RSA key can only be used to decrypt the traffic if the following are true: The cipher suite selected by the server is not using (EC)DHE. it should be text and has '-BEGIN RSA PRIVATE KEY-', or a PKCS12 store, i.e. The key exchange algorithm is specifying how keys for the bulk encryption/decryption cipher are exchanged. The key file should be in PEM format, i.e. ![]()
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