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.

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Table of Contents (9 chapters)
Title Page
Title Page
Packt Upsell
Packt Upsell
Contributor
Contributor
Preface
Preface
Free Chapter
1
Obfuscation
Obfuscation
About cryptography
Installing and setting up Python
Caesar cipher and ROT13
base64 encoding
XOR
Challenge 1 – the Caesar cipher
Challenge 2 – base64
Challenge 3 – XOR
Summary
2
Hashing
Hashing
MD5 and SHA hashes
Windows password hashes
Linux password hashes
Challenge 1 – cracking Windows hashes
Challenge 2 – cracking many-round hashes
Challenge 3 – cracking Linux hashes
Summary
3
Strong Encryption
Strong Encryption
Strong encryption with AES
ECB and CBC modes
Padding oracle attack
Strong encryption with RSA
Challenge – cracking RSA with similar factors
What's next?
Summary
Other Books You May Enjoy
Other Books You May Enjoy
Leave a review - let other readers know what you think
Index
Index

Windows password hashes

In this section, we will see how to get hashes with Cain and then how MD4 and Unicode work. Then, we'll discuss cracking hashes with Google and cracking hashes with wordlists.

Getting hashes with Cain

Cain is a free hacking tool that can harvest Windows hashes from a running operating system. In order to test it, we'll make three accounts on Windows Server, the very latest version of the Windows operating system. You can use the user command at the Command Prompt to do this. You can add a user named John with a password P@sw0rd, a user named Paul with a password, and a user named Ringo with password P@sw0rd999:

If you run Cain, it can harvest the hashes. The following screenshot shows the three users and their hashes:

The LM Hash section is an obsolete system that is no longer used by any version of Windows, so it just contains a dummy value that has no information. The actual hash used by Windows when you log in is called the NT Hash. Notice that if two users have the...

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