Book Image

Hands-On Cryptography with Python

By : Samuel Bowne
Book Image

Hands-On Cryptography with Python

By: Samuel Bowne

Overview of this book

Cryptography is essential for protecting sensitive information, but it is often performed inadequately or incorrectly. Hands-On Cryptography with Python starts by showing you how to encrypt and evaluate your data. The book will then walk you through various data encryption methods,such as obfuscation, hashing, and strong encryption, and will show how you can attack cryptographic systems. You will learn how to create hashes, crack them, and will understand why they are so different from each other. In the concluding chapters, you will use three NIST-recommended systems: the Advanced Encryption Standard (AES), the Secure Hash Algorithm (SHA), and the Rivest-Shamir-Adleman (RSA). By the end of this book, you will be able to deal with common errors in encryption.
Table of Contents (9 chapters)

Challenge 3 – cracking Linux hashes

After a review of Linux hashes, we'll show you your challenge.

Linux hashes are salted and stretched, and there are various versions of them. We are covering the current version, which is version 6, that is, the most secure form:

The hash is a long string starting with the dollar sign; the 6 indicates the version, then you have a dollar sign followed by salt, and another dollar sign followed by the hash. To calculate them in Python, you need to import a special SHA-512 crypt library, as you use the format shown earlier.

Here's your third challenge: a 3-digit password in this format. The salt value is penguins and the hash is this long mess starting with a P instance.