1 / 46

Network & Internet Security

Network & Internet Security. Chapter 4. Information Technology. Helps to produce, manipulate, store, communicate, and/or disseminate information Consists of Computers + Communications Most computers today have Internet access. LANS, MANS, and WANS.

bao
Download Presentation

Network & Internet Security

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Network & Internet Security Chapter 4

  2. Information Technology • Helps to produce, manipulate, store, communicate, and/or disseminate information • Consists of Computers + Communications • Most computers today have Internet access

  3. LANS, MANS, and WANS • Local area network (LAN) - a network of computers and other devices that is confined to a relatively small space, such as one building or even one office. • Metropolitan area network (MAN) - a network that connects clients and servers in multiple buildings in a region. • Wide area network (WAN) - a network that connects two or more geographically distinct LANs

  4. LAN (Short distance)

  5. MAN (Usually within a city)

  6. WAN (Large distance) Chicago Boston Seattle Washington San Diego Dallas

  7. From the Analog to the Digital Age • Tape recorders, voices, and musical instruments are analog. • CDs are digital.

  8. Going Digital • Music CD’s • Computers • TVs • Web TV • Telephones • Movies (DVD) • Newspapers

  9. Digital Television • Clearer picture • Supports HDTV

  10. HDTV

  11. Forms of Connectivity • Videoconferencing • Virtual Private Networks • Telecommuting & virtual offices • Home networks (WiFi) • Cell Phones • Bluetooth Plymouth State College

  12. Videoconferencing Plymouth State College

  13. VPNs • Virtual Private Networks • Private networks that use a public network, usually the internet, to connect remote sites

  14. VPN (Virtual Private Network) Internet

  15. Network Concerns and Protection • Hackers • Viruses • Snooping • Firewalls

  16. Cyberthreats, Hackers, & Safeguards • Problem: • Initially no security was built into the Internet. • The internet is used by some people who are not trustworthy. • All it takes is one computer on a LAN that has been compromised for all computers on it to be vulnerable.

  17. Cybercrime • Crimes committed with or against computers and networks • Includes unauthorized access or use • Hacking • Individual information • Business information • National security information Plymouth State University

  18. Cyberthreats, Hackers, & Safeguards • Hackers • People who gain unauthorized access to computers or networks, often for fun or to see if they can (not good) • Crackers • Malicious hackers who break into computers for malicious purposes

  19. Threats to Computers & Communications Systems • Worms • A program that copies itself repeatedly into a computer’s memory or onto a disk drive • Viruses • A is a “deviant” program, stored on a computer hard drive, that can cause unexpected and undesirable effects. Plymouth State University

  20. Viruses & Worms • How they spread • Via e-mail attachments • By infected floppies or CDs • By clicking on infiltrated websites • By downloading from infected files from websites • Through infiltrated Wi-Fi hotspots • From one infected PC on a LAN to another • What can you do about it? • Install anti-virus software and subscribe to the automatic anti-virus update service

  21. Cyberthreats, Hackers, & Safeguards • Trojan Horses • Programs that pretend to be a useful program such as a free game or screensaver. • Carry viruses or malicious instructions that damage your computer or install a backdoor or spyware • Backdoors and spyware allow others to access your computer without your knowledge

  22. Backdoor • Sometimes installed by a virus • http://www.youtube.com/watch?v=ahcVp8vIicI Plymouth State University

  23. Disgruntled Employees Plymouth State University

  24. Computer Criminals • Hackers • Crackers • Employees Plymouth State University

  25. Protecting Your Computer • Safeguards • Use antivirus software, and keep it current • Install a firewall to filter out undesirable traffic • Use robust passwords – • Minimum 8 characters with letters, numbers, characters • 4cats is not a good password, but f0UrK@tTz is • Install antispyware software • Encrypt financial and personal records • Back up your data, so if your PC is attacked and must be reformatted, you can restore your data

  26. Protecting Your Computer • Encryption • The process of altering readable data into unreadable form to prevent unauthorized access • Two forms: • Private Key encryption means the same secret key is used by both the sender and receiver to encrypt and decrypt a message • Public Key encryption means that two keys are used

  27. Encryption • Scrambles data before transmission • Uses encryption key • Plaintext versus cipher text

  28. Proof of Authenticity • Certificate Authority • Entity that issues digital certificates • Digital Certificate • Provided by a Certificate Authority • Has an expiration date • Digital Signature • Gives a recipient reason to believe that the message was created by a known sender Plymouth State University

  29. Validation Plymouth State University

  30. Vulnerable Communication • Home WiFi Networks • Cellular phones • Bluetooth Plymouth State University

  31. Cellular Phones Plymouth State University

  32. Wireless Communications MediaShort-range Wireless • Wi-Fi (802.11) networks • Wi-Fi b, a, and g correspond to 802.11b, 802.11a, and 802.11g • 802.11 is an IEEE wireless technical specification • 802.11b is older, transmits 11 megabits per second • 802.11a is faster than b but with weaker security than g • 802.11g is 54 megabits per second and transmits 50 ft • Warning! Security is disabled by default on Wi-Fi

  33. Wireless Communications MediaPersonal Area Wireless • Bluetooth • Short-range wireless standard to link cellphones, PDAs, computers, and peripherals at distances up to 30 ft • Named after King Harald Bluetooth, the Viking who unified Denmark and Norway • Transmits 720 kilobits per second • Bluetooth can also be used to eavesdrop on networks • Turn it off on your cell phone unless you need it at that time

  34. SafeguardsIdentification & Access • What you have • Cards, keys, signatures, badges, RFID,USB key • What you know • PINs, passwords, personal information • Who you are • Physical traits • Biometrics – fingerprints, iris, face recognition Joe Smith Fidelio Plymouth State University

  35. Stealing Passwords http://www.youtube.com/watch?v=O68zx6xTubs http://boingboing.net/2011/03/07/nevada-student-charg.html Plymouth State University

  36. Iris Scan Plymouth State University

  37. Safeguards • Encryption • Protection of software & data • Access, audit, & people controls • Disaster-recovery plans Plymouth State University

  38. Protection of Software & Data • Security procedures • Control of access • Audit controls • People controls • Disaster-recovery plan What can a business do if there are no disaster-recovery plans in place and a disaster occurs? Plymouth State University

  39. Attacks on Computers and Networks • Botnet • Denial-of-Service attack • Logic bomb • Trojan Horse • Malware on cell phones • Virus on router • iPod infected during manufacturing Plymouth State University

  40. Identity / Information Theft • Requests for information • Phishing (spoof E-mail) • Pharming (fake web site) • Auction fraud Plymouth State University

  41. Real Web Site Plymouth State University

  42. Fake Web Site Plymouth State University

  43. Protection at Work • No floppy / USB use • Secure access • Physical • Logical Plymouth State University

  44. Recent Problems • Cyberbullying • Cyberstalking • Pornography • Child predators Plymouth State University

  45. Internet Predators Plymouth State College

  46. Legal Protection • Laws changing due to changing technology Plymouth State University

More Related