To Encrypt TAR file with OpenSSL
tar -cP <directory to archive> | openssl des3 -salt -pass pass:password > filename.tar —–> Here at password please put your password
To Decrypt TAR file OpenSSL
cat filename.tar | openssl des3 -salt -d -pass pass:password | tar -x -C path-to-extract
Please Note: Here I have used "des3" encryption. You can select different encryption techniques.