Encrypted data packet

In example implementations, a method includes a software defined network (SDN) controller that selects an encryption key. The SDN controller then sends a first instruction to a source node to modify aflow table of the source node to include an action that includes the encryption key. A second instruction is sent by the SDN controller to a destination node to modify a flow table of the destinationnode to include an action that includes the encryption key. The SDN controller can then control a data packet that is encrypted by the source node with the encryption key to be sent from the source node to the destination node, wherein the data packet is to be decrypted with the encryption key by the destination node. 在示例实施方式中，方法包括：选择加密密钥的软件定义网络(SDN)控制器。然后，SDN控制器将第指令发送到源节点以修改源节点的流表，从而包括动作，该动作包括加密密钥。第二指令通过SDN控制器发送到目的地节点以修改目的地节点的流表，从而包括动作，该动作包括加密密钥。然后，SDN控制器能够控制将从源节点发送到目的地节点的、由源节点利用加密密钥加密的数据包，其中该数据包将由目的地节点利用加密密钥来解密。