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You're reading from CCNA Security 210-260 Certification Guide Build your knowledge of network security and pass your CCNA Security exam (210-260)

Product type Paperback

Published in Jun 2018

Publisher Packt

ISBN-13 9781787128873

Length 518 pages

Edition 1st Edition

Tools

Cisco

Concepts

IT Certification

Authors (3):

Glen D. Singh

Vinod

Anandh

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Table of Contents (23) Chapters

Title Page

Packt Upsell

Contributors

Preface

1. Exploring Security Threats FREE CHAPTER

2. Delving into Security Toolkits

3. Understanding Security Policies

4. Deep Diving into Cryptography

5. Implementing the AAA Framework

6. Securing the Control and Management Planes

7. Protecting Layer 2 Protocols

8. Protecting the Switch Infrastructure

9. Exploring Firewall Technologies

10. Cisco ASA

11. Advanced ASA Configuration

12. Configuring Zone-Based Firewalls

13. IPSec – The Protocol that Drives VPN

14. Configuring a Site-to-Site VPN

15. Configuring a Remote-Access VPN

16. Working with IPS

17. Application and Endpoint Security

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Index

Encryption algorithms

Furthering our discussion, we will dive a little bit deeper into understanding the different algorithms and how they are used to provide confidentiality.

Data Encryption Standard

The Data Encryption Standard (DES) is a symmetric encryption algorithm which uses the same key to both encrypt and decrypt data. It does this by encrypting a block of 64-bits in size using a 56-bit key. The size of the key makes a difference in the strength of the encryption itself; in this case, a 56-bit key is used per block. The smaller the key, the weaker and more vulnerable the encryption/algorithm is to being deciphered by a hacker.

Triple Data Encryption Standard (3DES)

The successor to the DES algorithm is the Triple DES (3DES), and this upgrade applies the DES three times to messages. The 3DES algorithm uses key sizes of 56-bits, 112-bits, and 168-bits, respectively. However, the block size still remains the same, 56-bits. To further explain how 3DES works, its uses a key to encrypt the...