5.3 Protecting Stored Data with Cryptography（用加密保护存储数据）

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学习目标 Learning Objectives

5.3.A Explain how encryption can be used to protect files.

- [5.3.A.1](/ek/5.3.A.1) — The purpose of cryptography is to hide information. A cryptographic algorithm defines a process … - [5.3.A.2](/ek/5.3.A.2) — An encryption algorithm defines a process for combining the information to be encrypted with a p… - [5.3.A.3](/ek/5.3.A.3) — The number of possible keys that can be used in an encryption algorithm is called the keyspace. … - [5.3.A.4](/ek/5.3.A.4) — Cryptographic algorithms are classified by whether they use one key or two keys. Bullet Symmetri… - [5.3.A.5](/ek/5.3.A.5) — Cryptographic algorithms are also classified by whether they process information one bit at a ti…

5.3.B Apply symmetric encryption algorithms to encrypt and decrypt data.

- [5.3.B.1](/ek/5.3.B.1) — Computer-based encryption algorithms operate on binary data. The most common symmetric encryptio… - [5.3.B.2](/ek/5.3.B.2) — AES is a symmetric key block cipher that encrypts data in 128-bit blocks (16 bytes). AES can ope… - [5.3.B.3](/ek/5.3.B.3) — Symmetric encryption and decryption can be performed using the command line, specialized softwar… - [5.3.B.4](/ek/5.3.B.4) — Using OpenSSL in a CLI, a user can encrypt and decrypt a file using the following commands (note…

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