Skip to main content

Security for VPNs with IPsec

This module describes how to configure basic IPsec VPNs. IPsec is a framework of open standards developed by the IETF. It provides security for the transmission of sensitive information over unprotected networks such as the Internet. IPsec acts at the network layer, protecting and authenticating IP packets between participating IPsec devices (“peers”), such as Cisco routers and so forth.

A Snippet Of What's Covered:

AES—Advanced Encryption Standard. A cryptographic algorithm that protects sensitive, unclassified information. AES is a privacy transform for IPsec and IKE and has been developed to replace DES. AES is designed to be more secure than DES. AES offers a larger key size, while ensuring that the only known approach to decrypt a message is for an intruder to try every possible key. AES has a variable key length—the algorithm can specify a 128-bit key (the default), a 192-bit key, or a 256-bit key.

DES—Data Encryption Standard. An algorithm that is used to encrypt packet data. Cisco software implements the mandatory 56-bit DES-CBC with Explicit IV. Cipher Block Chaining (CBC) requires an initialization vector (IV) to start encryption. The IV is explicitly given in the IPsec packet. For backwards compatibility, Cisco IOS IPsec also implements the RFC 1829 version of ESP DES-CBC.

Cisco IOS also implements Triple DES (168-bit) encryption, depending on the software versions available for a specific platform. Cisco no longer recommends Triple DES (3DES).

SHA-2 and SHA-1 family (HMAC variant)—Secure Hash Algorithm (SHA) 1 and 2. Both SHA-1 and SHA-2 are hash algorithms used to authenticate packet data and verify the integrity verification mechanisms for the IKE protocol. HMAC is a variant that provides an additional level of hashing. SHA-2 family adds the SHA-256 bit hash algorithm and SHA-384 bit hash algorithm.

File Type: PDF
File Size: 2.50 MB
Total Pages: 108

Direct Link Mega:
Download Now
Direct Link AnonFiles:
Download Now
Direct Link Mediafire:
Download Now
Direct Link Solidfiles:
Download Now
Direct Link Sabercathost:
Download Now
Direct Link Tusfiles:
Download Now


Popular posts from this blog

Web Hacking 101

With a Foreword written by HackerOne Co-Founders Michiel Prins and Jobert Abma, Web Hacking 101 is about the ethical exploration of software for security issues but learning to hack isn't always easy. With few exceptions, existing books are overly technical, only dedicate a single chapter to website vulnerabilities or don't include any real world examples. This book is different. Using publicly disclosed vulnerabilities, Web Hacking 101 explains common web vulnerabilities and will show you how to start finding vulnerabilities and collecting bounties.

Android Things Quick Start Guide

Android Things is the new Android based Operating System for the Internet of Things. With this book you will learn the core concepts by running code examples on different peripherals. Android Things is the IoT platform made by Google, based on Android. It allows us to build smart devices in a simple and convenient way, leveraging on the Android ecosystem tools and libraries, while letting Google take care of security updates.

Programming QuickStart Box Set

This tutorial on HTML is designed specifically for aspiring developers and web designers. This tutorial is explained in enough detail with practical examples and a simple overview so that it can be easily understood by beginners and provides enough knowledge to design their own webpages. You can get a higher level of expertise with some practice.  HTML or Hyper Text Markup Language is the most commonly used language for developing web pages.