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Lecture Network security: Chapter 10 - Dr. Munam Ali Shah
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Lecture Network security: Chapter 10 - Dr. Munam Ali Shah
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The topic discussed in this chapter are cryptography as a network security tool. In this chapter we will talk about what cryptography is and why is it used; some basic terminologies such as plain text, cipher text, cryptanalysis will also form part of todays lecture discussion; types of cryptography attacks. | Network Security Lecture 10 Presented by: Dr. Munam Ali Shah Part 2 (b) Cryptography as a Network Security Tool Summary of the previous lecture We talked about how device security, traffic security and barrier security can help us achieving mobile device security strategy. We also discussed, the RSN and IEEE802.11i standard to ensure more security in our WLAN. 5 phases operation in 11i was also part pf previous lecture discussion And lastly, we discussed the Model for Network Security. Outlines of today’s lecture We will talk about : What Cryptography is and why is it used Some basic terminologies such as plain text, cipher text, cryptanalysis will also form part of todays lecture discussion Types of cryptography attacks Objectives You would be able to present an overview of cryptography and how this tool can ensure the network security. Understand the basics phenomenon to deploying cryptography in different environments Cryptography The art of secret writing Cryptography Cryptography | Network Security Lecture 10 Presented by: Dr. Munam Ali Shah Part 2 (b) Cryptography as a Network Security Tool Summary of the previous lecture We talked about how device security, traffic security and barrier security can help us achieving mobile device security strategy. We also discussed, the RSN and IEEE802.11i standard to ensure more security in our WLAN. 5 phases operation in 11i was also part pf previous lecture discussion And lastly, we discussed the Model for Network Security. Outlines of today’s lecture We will talk about : What Cryptography is and why is it used Some basic terminologies such as plain text, cipher text, cryptanalysis will also form part of todays lecture discussion Types of cryptography attacks Objectives You would be able to present an overview of cryptography and how this tool can ensure the network security. Understand the basics phenomenon to deploying cryptography in different environments Cryptography The art of secret writing Cryptography Cryptography is the art and science of secrecy Hiding one’s secrets has always been human’s desire Historically, cryptography has been associated with military But now its everywhere So! What is Cryptography? There can be many definitions. Actually I am not able to find a definition that portrays the whole picture covering all the goals and features of Cryptography. Most of the definitions talk only about data hiding which is just one aspect of Crypto but it has many more aspects such as data integrity, authentication and non-repudiation to name a few. Anyway this is one of the definitions of Crypto found in literature. It says “Cryptography is the art and science of secrecy”. Why an art? Because traditionally, crypto has been all about innovation and artistic thinking. Creating a new cipher or code is in a way similar to writing a new poem or to create a new musical composition. Starting from the Caesar’s cipher till the ciphers used in the last century, there was no scientific or mathematical .
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