In embedded development and network operations, when devices connect to different networks through multiple network interfaces (such as Ethernet, Wi-Fi, and 4G modules), how can we ensure that data packets are transmitted through the “optimal path”? The core of this is the metric. This article will delve into this mechanism and introduce simple operational commands. … Read more
UNC: Unified Coarse Thread 5/16: Nominal Size of the Thread, in Inches 18: Pitch of 1/18, which means 18 threads per inch 3A: Tolerance Grade, Level 3, External Thread (B is for Internal Thread) R.H: Right-Handed What Are the Differences Between Unified Threads and Metric Threads? Metric threads are indicated by pitch, while Unified and … Read more
History Before 1976, the encryption world mainly used Symmetric-key algorithms. Symmetric encryption has a troublesome problem: when parties A and B communicate, A must inform B of the encryption rules; otherwise, decryption is impossible. Is it possible to ensure the security of key storage and transmission? In 1976, two American computer scientists, Whitfield Diffie and … Read more
Privacy protection? It’s not to scare everyone; information is transparent, but we should still try to maintain personal privacy. Today, we will learn about symmetric encryption and asymmetric encryption. First, let’s read this character “钥”, is it pronounced “yao” or “yue”? Check the image below. 1. Symmetric Encryption As the name suggests, in symmetric encryption, … Read more
Today, we will introduce commonly used encryption algorithms, their classifications, and applications. 1. Symmetric Encryption Algorithms Symmetric means that both parties using this encryption method use the same key for encryption and decryption. The key is the instruction that controls the encryption and decryption process. The algorithm is a set of rules that specifies how … Read more