Key Concepts of Virtual Private Networks by Thoas Powel
Virtual Private Networks claim to solve majority of the security problems faced by the enterprises. Most of the issues were related to secure data transfer over the public internet. The internet's greatest asset is ubiquity and openness but this is its greatest weakness as well. ... Private Key encryption and Public Key encryption methods are the most common methods available presently. ... The disadvantage of a public key encryption system is that it requires more computation. ... The DES secret key algorithm and Diffie-Hellman public key algorithm can be used in conjunction.

Wireless Networking and Security by Andrew Mapp
Although Wireless Networking has great benefits, which are undoubtedly, there are also some drawbacks, which should be considered. Drawbacks such as Electromagnetic interferences, a slower transfer speed then wired Networks and diverse security concerns. ... The WEP encryption serves two main purposes authentication and data encryption. ... Although WEP encryption provides some degree of security and privacy it is not flawless And can be broken with certain tools within only a few hours. ... This is a symmetric stream cipher and it can use two types of encryption keys.

Configuring NTP On Your Linux Server by David Evans
The Network Time Protocol (NTP) defines a set of algorithms for the dissemination of time across the Internet. The NTP protocol can be used to synchronise the system time on your Linux Server with a highly accurate Internet time reference. This article describes how to configure the Network Time... NTP keys are stored in the ‘ntp.keys' file in the following format: Key-number M Key (The M stands for MD5 encryption), e.g.: 1 M secret 5 M RaBBit 7 M TiMeLy 10 M MYKEY The NTP configuration file ‘ntp.conf' specifies which of the keys are trusted.

Securing Your Wireless LAN by Jonathan Coupal
Introduction It has become common practice to deploy wireless networks for convenience applications requiring users to be mobile. Also many "road warriors" have Wi-Fi accounts that let them access the Internet and the corporate network from remote locations. ... However, WEP has significant weaknesses, most notably that it uses encryption keys that are both static and known by stations across the network, and it uses a weak implementation of the encryption algorithm. ... Although a less secure VPN option than IPSec, Point-to-Point Tunneling Protocol (PPTP) can be layered over WEP to...

Cryptography & JCE Overview by Geoff Whittington
Introduction In the 21st Century, information is being exchanged electronically at an ever-increasing rate. Financial markets, commerce, and communication between citizens of all nations are utilizing the Internet and proprietary networks to exchange sensitive information. ... The method is defined as: public Key doPhase(Key key, boolean lastPhase); For Alice and Bob, a single call to this method the other person’s public key using in place of key and lastPhase=true, is sufficient. ... The property of a public key system is that the sender can encrypt a message using the intended...

Wireless at the Workplace by Jonathan Coupal
Wi-Fi, or wireless fidelity, is a term promulgated by the non-profit Wireless Fidelity Alliance organization to designate products adhering to the IEEE 802.11 standard for wireless LANs. A Wi-Fi network broadcasts a radio signal, operating in the unlicensed 2.4 and 5 GHz radio bands, with a data... And the Wi-Fi Alliance has developed security standards such as 802.11i and 802.1x which use advanced encryption technologies such as AES and TKIP, as well as secure key-distribution methods. ... It is important to note, however, that WPA and other wireless encryption methods protect only...

I Know What You Did Last Session: Basic Applied Cryptography by Jeremy Martin
While Janet was sitting in a cyber café sending emails to friends and surfing the web, there was a person sitting three tables away reading each email she sent before they ever got to the email server. During this period of time, the thief was able to get access to her bank account, passwords to... When the message reaches the recipient the message is decrypted with the recipient’s private key, and then verified using the author’s public key. ... Another advantage of S-HTTP is that it allows for two-way client/server authentication Tunneling encryption (Securing network traffic) IPSec:...

High Tech Post by Peter Koch
INTRODUCTION Retriever Communications was founded in 1996 with the sole mission being the development of a Mobile Application Service to be delivered on hand held, laptop computers and smart phones, over public mobile telecommunications.Since then, Retriever has established itself successfully... At the time, no software existed to provide all the functionality required, and Retriever extended its original product line of GPRS support to include WiFi with authentication and encryption to HK Post standards as well as the roaming between networks types.

Steganography in Principle by Emmanuel Sodipo
1.0 Introduction Steganography is one of the oldest arts that people have always wanted to have since they started communicating with each other, but sadly the least researched. Most people study steganography either as academic discipline or out of curiosity and I belong to the latter camp. ... 2.4.2 Public-Key Steganography In this approach the secret key does not have to be agreed between Alice and Bob before imprisonment, but one must know the public key of the other. ... 2.4 Private And Public key Steganography In order to effectively describe the private and public key...

Security Risks and Ways to Decrease Vulnerabilities in a 802.11b Wireless Environment by Richard Johnson
Introduction This document explains topics relating to wireless networks. The main topics discussed include, what type of vulnerabilities exist today in 802.11 networks and ways that you can help prevent these vulnerabilities from happening. Wireless networks have not been around for many years. ... PKI - Public-key infrastructure (PKI) is the combination of software, encryption technologies, and services that enables enterprises to protect the security of their communications and business transactions on the Internet.