openssl
check https connection
openssl s_client -connect domain.com:443
encrypt file
openssl enc -aes-256-cbc -salt -in examplefile -out examplefile.enc
decrypt file
openssl enc -aes-256-cbc -d -in examplefile.enc -out examplefile
encryption
https://linuxconfig.org/using-openssl-to-encrypt-messages-and-files-on-linux