Book Image

Security with Go

By : John Daniel Leon
Book Image

Security with Go

By: John Daniel Leon

Overview of this book

Go is becoming more and more popular as a language for security experts. Its wide use in server and cloud environments, its speed and ease of use, and its evident capabilities for data analysis, have made it a prime choice for developers who need to think about security. Security with Go is the first Golang security book, and it is useful for both blue team and red team applications. With this book, you will learn how to write secure software, monitor your systems, secure your data, attack systems, and extract information. Defensive topics include cryptography, forensics, packet capturing, and building secure web applications. Offensive topics include brute force, port scanning, packet injection, web scraping, social engineering, and post exploitation techniques.
Table of Contents (15 chapters)

Hashing

Hashing is when a variable length message is transformed into a unique fixed-length alphanumeric string. There are various hashing algorithms available, such as MD5 and SHA1. Hashes are one-way and non-invertible, unlike symmetric encryption functions, such as AES, which can recover the original message if you have the key. Because hashes cannot be reversed, most of them are cracked by brute force. Crackers will build power-sucking rigs with several GPUs to hash every possible character combination until they find a hash that matches. They will also generate rainbow tables or files containing all of the hash outputs generated for quick lookup.

Salting your hashes is important for this reason. Salting is the process of adding a random string to the end of the password, provided by a user, to add more randomness or entropy. Consider an application that stores user login...