19_091009_Chpt06 - MIS 301 Introduction to IT Management...

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Unformatted text preview: MIS 301 Introduction to IT Management Lizhen Xu IROM Department McCombs School of Business Chapter 6 Data Communications Recap You Roommate Printer Access Point Switch Modem ISP UTP Cable U T P C a b l e UTP Cable 802.3 8 2 . 3 802.3 802.11 NIC MAC address DSL (ADSL) Dial-up Cable Narrowband Broadband LAN Ethernet / Recap 1. Device Access Router - contains Ethernet LAN switch 802.11g wireless access point Router 2. UTP cable 3. Printer NIC 4. Printer 5. DSL modem 1 2 3 4 5 Recap PSDN Networks of Leased Lines Two Threats Snooping Encryption! Malicious access to organizational network resources Firewalls! How Does Encryption Work? Encryption Transforming clear text into coded text Used for secure storage or communication Uses algorithms: DES, 3DES, AES Key: Used to encrypt data Algorithm applies key to produce coded message Symmetric encryption Asymmetric encryption Encryption Encryption Encryption and Decryption Clear Text Clear Text Cipher Text M e e t m e a t M i d n i g h t 8 v y a l e h 3 1 & d k t u . d t r w 8 7 4 3 $ F i e * n P 9 3 h M e e t m e a t M i d n i g h t Decryption Decryption Symmetric & Asymmetric encryption Symmetric & Asymmetric encryption...
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This note was uploaded on 12/17/2010 for the course MIS 03765 taught by Professor Xu during the Fall '09 term at University of Texas at Austin.

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19_091009_Chpt06 - MIS 301 Introduction to IT Management...

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