¶Digital Reform

There was a vary circumstances from digital governance, industry, manufacture and medicine, and the booming of
new business models has stimulated enterprises to accelerate digital transformation for better company management
and customer service, which further promotes the upgrading and optimization of the Chinese digital economy.

¶Introduction

Keys are critical in cryptographic operations in public-key infrastructure(PKI). SSL handshake invoke exchanging several pieces of information, such as public keys, private keys, shared secrets, pre-master secrets, and master secrets.

Let’s explore what happens between the key exchange and the data encryption and authentication.

本章覆盖有：

• 简单、自由(free)函数和方法需要避免写入生命周期指示器(lifetime specifiers)，因为它们是被推断的
• 为什么包含引用的结构体(structs)、元组-结构体(tuple-structs)、枚举(enums)需要生命周期指示器(lifetime specifiers)
• 如何为结构体(structs)、元组-结构体(tuple-structs)、枚举(enums)编写生命周期指示器(lifetime specifiers)
• 为什么包含指向泛型参数的结构体需要生命周期边界(协变、逆协变)

本章覆盖有：

• “租借，borrowing”和“生命周期，lifetime”的概念
• 困扰系统软件的租借典型错误是哪些
• 如何通过租借checker，Rust的严格语法来避免这种典型错误
• 如何通过插入语句块来约束租借的作用域(scope)
• 为什么函数返回的引用需要生命周期指示符(specifiers)
• 如何给函数使用生命周期指示符(lifetime specifiers)，它们表示什么
• 租借checker的任务是什么