服务器端"dbhome_1\NETWORK\ADMIN\"sqlnet.ora文件中添加
SQLNET.ENCRYPTION_SERVER = requested
SQLNET.ENCRYPTION_TYPES_SERVER= (RC4_256)
添加后新的链接即刻生效，服务器无需重新启动。
也可以通过Net manager管理工具添加
各个参数含义如下：
是否加密（ENCRYPTION_SERVER）取值包含REJECTED、ACCEPTED、REQUESTED、REQUIRED
客户端（ENCRYPTION_Client参数）和服务器端（ENCRYPTION_SERVER）设置不同的的实际结果如下表
| Client Setting | Server Setting | Encryption and Data Negotiation |
|---|---|---|
| REJECTED | REJECTED | OFF |
| ACCEPTED | REJECTED | OFF |
| REQUESTED | REJECTED | OFF |
| REQUIRED | REJECTED | Connection fails |
| REJECTED | ACCEPTED | OFF |
| ACCEPTED | ACCEPTED | OFF |
| REQUESTED | ACCEPTED | ON |
| REQUIRED | ACCEPTED | ON |
| REJECTED | REQUESTED | OFF |
| ACCEPTED | REQUESTED | ON |
| REQUESTED | REQUESTED | ON |
| REQUIRED | REQUESTED | ON |
| REJECTED | REQUIRED | Connection fails |
| ACCEPTED | REQUIRED | ON |
| REQUESTED | REQUIRED | ON |
| REQUIRED | REQUIRED | ON |
加密方法（ENCRYPTION_TYPES_SERVER）有如下选项：
| Algorithm Name | Legal Value |
|---|---|
| RC4 256-bit key | RC4_256 |
| RC4 128-bit key | RC4_128 |
| RC4 56-bit key | RC4_56 |
| RC4 40-bit key | RC4_40 |
| AES 256-bit key | AES256 |
| AES 192-bit key | AES192 |
| AES 128-bit key | AES128 |
| 3-key 3DES | 3DES168 |
| 2-key 3DES | 3DES112 |
| DES 56-bit key | DES |
| DES 40-bit key | DES40 |