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文章来源：https://www.toymoban.com/news/detail-683728.html |
DES40文章来源地址https://www.toymoban.com/news/detail-683728.html |
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