**Book Of Secrets**

**Cryptography** **Handbook** For Beginners

**Let’s start with a question**

You Enter your office and you need to enter a **4**-character password

The keypad has **10** digits

# “How many **password possibilities** are there? “

Using basic math, The answer is **10 to the power of 4 ( you multiply 10 by itself 4 times )**

This question actually leads to some basic crypto terminology

- The
**secret key**complexity is**10**digits from**0–9** - The
**key length**is**4**characters - The
**keyspace**, the number of possibilities is**10,000**combinations

When we deal with cryptography, the art of hiding things, anyone knows what is the cipher algorithm that generated the cipher message. But the attacker/hacker tries to find out what is the** secret key**

**“Book Of Secrets”**, will walk you through the most important cryptographic concepts from the classic era up until now. we will look at different use cases and learn how encryption and cryptanalysis work.

This book is a fascinating journey to one of the most secret and unknown skill

**Every chapter includes hands-on practices**

**It is written for beginners and intermediate users**