The motivations for security in cellular telecommunications systems are to secure conversations and signaling data from interception as well as to prevent cellular telephone fraud. With the older analog-based cellular telephone systems such as the Advanced Mobile Phone System (AMPS) and the Total Access Communication System (TACS), it is a relatively simple matter for the radio hobbyist to intercept cellular telephone conversations with a police scanner. A well-publicized case involved a potentially embarrassing cellular telephone conversation ....etc

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Presented By
SHASHANK.M


WPA 2:WIRELESS PROTECTED ACCESS
Overview
What is WPA2?
 Wi-Fi Protected Access 2
 Introduced September 2004
 Two Versions
 Enterprise – Server Authentication 802.1x
 Personal – AES Pre-Shared Key
 Full implementation of 802.11i
Bit of History
802.11-1997
 First wireless networking standard
 Security via WEP
 Wired Equivalent Privacy
 WEP shown to have weaknesses in 2001 involving its use of RC4-Stream Cipher
 Today it can be ....etc

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Cryptography

ABSTRACT
This paper introduces Cryptography
Techniques. Cryptography is The science of
protecting data & Network Security keeping
information private and Secure from
unauthorized Users.
This paper gives the Fundamental
Requirements for the Data Transmission, the
security attacks like Interruption, Interception
and Modification of the data Transmission.
The Cryptographic Process
explaining through a generalized function is
discussed through which encryption and
decryption is done by the various ....etc

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Increasing the Efficiency of Ideal Solar Cells by Photon Induced Transitions
at Intermediate Levels

Antonio Luque and Antonio Martı´
Instituto de Energı´a Solar, Universidad Politécnica de Madrid, 28040 Madrid, Spain
(Received 7 February 1997)


Recent attempts have been made to increase the efficiency of solar cells by introducing an impurity
level in the semiconductor band gap. We present an analysis of such a structure under ideal conditions.
We prove that its efficiency can exceed not only the S ....etc

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Introduction to Symmetric Block Cipher
Cryptography
• Encryption algorithm also called a cipher
• Cryptography has evolved so that modern encryption and decryption use secret keys
• Cryptographic algorithms can be openly published
• Only have to protect the keys
Symmetric-Key Cryptography
• Both sender and receiver keys are the same: KA=KB
• The keys must be kept secret and securely distributed
• Thus, also called “Secret Key Cryptography”
• Data Encryption Standard (D ....etc

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GSM Security And Encryption

Abstract:
The motivations for security in cellular telecommunications systems are to secure conversations and signaling data from interception as well as to prevent cellular telephone fraud. With the older analog-based cellular telephone systems such as the Advanced Mobile Phone System (AMPS) and the Total Access Communication System (TACS), it is a relatively simple matter for the radio hobbyist to intercept cellular telephone conversations with a polic ....etc

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IPV4 vs IPV6
Presented by: BASHA K M
S7T2
College Of Engineering, Trivandrum
2007-11 batch


OUTLINE
IP Network Addressing
Classful IP addressing
Techniques to reduce address shortage in IPv4
Features of IPv6
Header Comparisons
Extension Headers
Conclusions
IP Network Addressing
INTERNET world’s largest public data network, doubling in size every nine months
IPv4, defines a 32-bit address - 232 (4,294,967,296) IPv4 addresses a ....etc

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WiMAX for Broadband Wireless Access
Presented By:
Karim M. El Defrawy
ICS
UCI-2005
Outline
What is WiMAX
802.16 Introduction
802.16 MAC Highlights
802.16 Reference Model
MAC Convergence Sub-Layer (CS)
MAC Common Part Sub-Layer (CPS)
MAC Privacy Sub-Layer (PS)
Questions
What is WiMAX?
Worldwide Interoperability for Microwave Access (WiMAX) is the common name associated to the IEEE 802.16a/REVd/e

standards.

These standards are issued by the IEEE 802.16 subgroup that originally covered the Wireless Local Loop technol ....etc

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ABSTRACT
Wireless connectivity of a vast number of industrial and home applications has modest transmission data requirements, but demands reliable and secure communication using simple low-cost and low-power radio systems. In the quest for high-bandwidth, multimedia-capable wireless networks, the need for cost and power-effective radio solutions for this vast number of fairly simple applications was only recently addressed by a standardized technology.
The IEEE 802.15.4 standard and ZigBee wireless technology are d ....etc

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Hi,
myself ashwin kulkarni, practicing structural engineer,
private professional,
am trying to study this subject, expecting a job,
came across this while hunting,
kindly mail the chimney foundation design xls to me at
[email protected],
am happy somebody is sharing this for free,
will be thankful, grateful & in touch with this forum,
regards,
ashwin. ....etc

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CRYPTOGRAPHY AND NETWORK SECURITY
Abstract
Network security is a complicated subject, historically only tackled by
well-trained and experienced experts. However, as more and more people
become wired'', an increasing number of people need to understand the
basics of security in a networked world. This document was written with
the basic computer user and information systems manager in mind,
explaining the concepts needed to read through the hype in the
marketplace and understand risks and how to dea ....etc

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