Read this web page for a good summary on decrypting with wireshark. https://www.packetsafari.com/blog/2022/10/07/wireshark-decryption/ Basically, if the captured pcap file uses RSA handshake, you can decrypt it. If is uses ephemeral Diffie-Hellman, you can’t, you need to have also captured the ephemeral keys via a separate mechanism while the handshake is taking place. RSA is very uncommon these days as it’s considered less secure.
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