Oracle Encryption

Native Network Encryption (NNE)

Enable

Set these parameters in sqlnet.ora

Client Side Config

In the Client side sqlnet.ora

Bibliography

https://docs.oracle.com/database/121/DBSEG/asossl.htm (12.1 Database Security Guide - 18 Configuring Secure Sockets Layer Authentication)
NNEChanges in Native Network Encryption (NNE) with the July 2021 Critical Patch Update (Doc ID 2791571.1)
Thales CipherTrust Database Proctectionhttps://www.thalesdocs.com/ctp/con/cdp/cdp-oracle/latest/admin/index.html