We have a 2 node RAC installed and working - is there any sort of encryption between both nodes

19c RAC on RedHat Linux.

ps -ef |grep tns |grep -v root |grep -v grep

/u01/app/19.0.0/grid/bin/tnslsnr LISTENER -no_crs_notify -inherit

/u01/app/19.0.0/grid/bin/tnslsnr ASMNET1LSNR_ASM -no_crs_notify -inherit

/u01/app/19.0.0/grid/bin/tnslsnr LISTENER_SCAN1 -no_crs_notify -inherit

The ports used are 1521 and 1525 .

Is traffic between nodes or between client desktops and the server encrypted at all ?

If not, what is the best way to get an additional layer of security ?

Thanks !