Symmetric Encryption and Decryption
In this chapter, we will learn about the important concepts of symmetric encryption – cipher, encryption mode, and padding. There will be an overview of modern ciphers, encryption modes, and padding types and recommendations on which technology to use in which situation. The usage of those technologies will be illustrated by code examples. This is the first chapter that will contain code examples; thus, we will also need to learn how to initialize older versions of the OpenSSL library if we ever want to run our code with an older version of OpenSSL.
We are going to cover the following topics in this chapter:
- Understanding symmetric encryption
- An overview of the symmetric ciphers supported by OpenSSL
- Block cipher modes of operation
- Padding for block ciphers
- How to generate symmetric encryption keys
- Downloading and installing OpenSSL
- How to encrypt and decrypt with AES on the command line
- Initializing and...
