In view of the increase of network information transmission times, the transmission delay of multi hop nodes in the Internet of Things increases, resulting in the decline of network information transmission performance. In order to improve the quality and performance of information transmission, a minimum transmission delay algorithm of multi-hop nodes in the Internet of Things is designed based on symmetric algorithm. In the perception layer of the Internet of Things, based on the revocable symmetric encryption algorithm, the multi-hop nodes in the perception layer are encrypted; The link information transmission delay under the direct transmission, cooperative transmission and multi-hop transmission modes is compared, and the gradient projection algorithm is used to solve the problem of minimizing the delay of multi-hop nodes’ information transmission in the Internet of Things. After calculating the projection matrix and the gradient, the iteration terminates when the steady link traffic and the delay value are obtained. The source node refers to the network node that acts as the source to send the original data packet; the source node uses this algorithm to select the transmission mode with minimum delay, and sends information to the destination node step by step. The simulation test shows that the algorithm can guarantee the security of data transmission of multi-hop nodes in the Internet of Things, and the transmission delay is the minimum.

鉴于网络信息传输时间的增加，物联网中多跳节点的传输延迟增加，导致网络信息传输性能下降。为了提高信息传输的质量和性能，设计了基于对称算法的物联网多跳节点最小传输延迟算法。在物联网的感知层中，基于可撤销的对称加密算法，对感知层中的多跳节点进行加密；比较了直接传输，协作传输和多跳传输模式下的链路信息传输时延，梯度投影算法用于解决物联网中多跳节点信息传输的时延最小化问题。在计算投影矩阵和梯度之后，当获得稳定的链路流量和延迟值时，迭代将终止。源节点是指作为发送原始数据包的源的网络节点。源节点使用此算法选择延迟最小的传输模式，然后逐步将信息发送到目标节点。仿真测试表明，该算法可以保证物联网中多跳节点数据传输的安全性，并且传输延迟最小。当获得稳定的链路流量和延迟值时，迭代终止。源节点是指作为发送原始数据包的源的网络节点。源节点使用该算法选择延迟最小的传输模式，然后逐步将信息发送到目标节点。仿真测试表明，该算法可以保证物联网中多跳节点数据传输的安全性，传输时延最小。当获得稳定的链路流量和延迟值时，迭代终止。源节点是指作为发送原始数据包的源的网络节点。源节点使用该算法选择延迟最小的传输模式，然后逐步将信息发送到目标节点。仿真测试表明，该算法可以保证物联网中多跳节点数据传输的安全性，并且传输延迟最小。