Deciphering https traffic log.pcap files

hello ,
how can i read log.pcap.xxx files with suricata from my /var/log/suricata directory ?
how can i to decipher the traffic?
also, I’m not sure I selected the right category

could you help me ?
Regards

Since these are pcap files, any tool or utility that handles them can be used.
Common ones are tcpdump, tshark, or wireshark (graphical UI). There are others depending on your needs but these are commonly used.

how to decrypt the files too, where are the keys and how to use them?

The pcap files produced by Suricata are compressed – they are not encrypted. You can use gzip or another Linux utility to decompress.

I mean the basic traffic of log.pcap files, I’m not talking about a supposed encryption layer above, we are agreed?

For encrypted traffic you would have to acquire the keys, depending on the protocol you could do the decipher in wireshark