ࡱ> [Z;( / 00DArialngsRomanll 0DGaramondRomanll 0 DTimes New Romanll 00DWingdingsRomanll 0@0.  @n?" dd@  @@`` T;       0AA@8ʚ;ʚ;g4<d<dM 0Vppp@ <4dddd8A10l 0___PPT10 ~___PPT9`X@?  %*5Telnet and FTP TelnetLets you use the resources of some other computer on the Internet to access files, run programs, etc. Creates interactive connection with remote machine To use: Need telnet application software  Microsoft Windows Telnet (built into Windows 95 and greater) Macintosh Terminal (built into Mac OS X and greater) Need an account on remote machine  you will be prompted login and password OR Some systems will allow you to login as guest to access some resources like databases Example: telnet cisunix.unh.edu Z#ZrZLZZ`ZZZ#rO`rshtrsh  remote shell Another protocol that allows us login access Use the rlogin (remote login) command in the terminal window Example: rlogin cisunix.unh.edu  l username (you can omit  l username if your username is the same on both systems) rlogin skips past the login: prompt and will present the Password: prompt>kJkJ$ssh.ssh  secure shell ssh is another popular protocol that allows us login access More secure than telnet or rsh since it encrypts all data that passes over the network This can prevent a third party from spying on the network traffic and reading your sensitive information (like your password) Example: slogin euler.unh.edu  l username (Avoid using the generic cisunix.unh.edu with slogin or you may get a warning message about conflicting host keys) ssh secure shell replaces other, insecure terminal applications like Telnet and FTP PPP PPTPPPP TU &?SFTPFTP  file transfer protocol Allows you to send files and directories over a network FTP client  software that allows you to connect to an FTP server on the Internet Originally clients were text-based and used commands (much like UNIX)  these still exist Graphical based FTP clients now exist; e.g.: WS_FTP File Manager through Blackboard Clients transfer data in one of two modes: ascii (for text files) and binary (for all others) Need an account on remote system (username and password) but some sites allow anonymous ftp Login with anonymous Enter email address as password Good for downloading software and database information (otherwise information would have to be sent sneakernet or as an email attachment) PP'P^P\PPP'^\  ,#  Viruses&Downloading files from the Internet introduces the possibility that your computer could become infected with a virus Virus  generic term applied to a wide variety of malicious programs that invade your computer; not all cause damage (but many do) Computer virus is similar to biological virus in that it passes from computer to computer like a biological virus passes from person to person Platform specific (e.g., a Windows virus will not infect UNIX system, etc.) Types: Traditional virus  attach to programs or data files, replicate themselves, then damage data, hard disk, etc. Worms  stand alone programs designed to infect networks. They travel from network to network, replicating themselves along the way. Trojan Horse program  legitimate program with hidden code that is activated by a trigger that causes the code to execute Email Virus  gets transmitted in email messages.ZZ Viruses - PreventionUse a secure operating system Run antivirus software (aka virus detection software) Scanner  checks files to see if they were infected: Looks for characteristic data patterns found in programs infected by known viruses Determines if a program s file size is changed Eradication program  disinfects by wiping virus from hard drive Innoculators  will prohibit a program from running if it detects a virus Keep antivirus software up-to-date Avoid programs from unknown sources (like Internet) including mail attachments from unknown senders Don t use pirated copies of software; purchase commercial software on CDs as they cannot be modified Don t double-click on an email attachment that contains an executable (file extension like .exe, .com, .vbs) and don t run macros in a document unless you know what they do Back up files regularly just in case& TnP5nPPnPnPT5  >6 h Adware and Spyware$Adware  software that displays ads on your computer Ads pop up even if you are not browsing the Web Some companies provide free software in exchange for advertising on your display Spyware  software that sends your personal information to a third party without your permission or knowledge; collects info about: Web sites you visit Sensitive info like your username and password Some companies use collected info to send you unsolicited targeted ads Both cause performance issues with your computer like: Computer hangs frequently, slows down, does not work properly Hijacks your Web browser, gives you a new start page 5ZZZZ7ZtZ57t  $:Adware and Spyware - (con t) 6Usually install secretly on your computer by either: Tricking you into clicking a link that installs it; e.g., it opens a Window dialog box, you click Cancel and it installs it Installing freeware that installs it; e.g., free file sharing program might secretly install spyware on your computer To protect against adware and spyware: Use antivirus software as newer products now include adware and spyware scanning; Some ISPs are now providing protection from adware and spyware as well Make sure that the programs you install do not contain adware: Read license agreement carefully Check the publisher s Web site carefully Search the Internet for the name of the program and the keywords adware and spyware Install a pop-up blocker to prevent adware and spyware pop-up windows (then you won t accidently click a deceptive link) Do not unwittingly install adware or spyware; e.g., you may see a dialog box to verify that you want to install a program  click No5PP'PPPP5F'%77@% 4Y/T   0` 3333ff3` 3333f33ff3` "3333̙ff3` Kf3̙` &e̙3g3f` f333̙po7` ___f3̙;/f9` ff3Lm` ff3LmNLm>?" dd@*?nAd@q<nAqFLK#M n?" dd@   @@``PR    M`2p>> &@(    Hy? ?" `}  X Click to edit Master title style!!  @  H|? ?" `  RClick to edit Master text styles Second level Third level Fourth level Fifth level!    S    6 #" `] `}  ^*     6 #" ``   d*       6 #" `] `}  d*       C @ABCDE FjJ@3"0`B  s *DjJ"0 `0H  0޽h ? ___f3̙;/f9___PPT10i.  +D=' = @B + Edge 0  P(    HІ? ?"@  X Click to edit Master title style!!    HD? ?"   [#Click to edit Master subtitle style$$    6 #" `] `}  ^*     60 #" `]}   d*       6P #" `] `}  d*       C @ABCDE F8c@3"@B  s *DjJ"  ,$0H  0޽h ? ___f3̙;/f9___PPT10i.  +ityD=' = @B +0 zr8 (  8 8 0 P    P*   8 0     R*  d 8 c $ ?   8 0w  0  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S 8 640 _P   P*   8 6P _   R*  H 8 0޽h ? 3380___PPT10.T O0  0(  x  c $l@  x  c $   H  0޽h ? 33___PPT10i.L PU+D=' = @B + 0 $6(  $~ $ s * `}   x $ c $0`  H $ 0޽h ? 33___PPT10i.L PU+D=' = @B +} 0  $(   r  S `) `}   r  S 8* `  H  0޽h ? ___f3̙;/f9___PPT10i.P ),+D=' = @B +} 0 ($(  (r ( S  `}   r ( S |``  H ( 0޽h ? ___f3̙;/f9___PPT10i.P e+D=' = @B +} 0 0$(  0r 0 S @c `}   r 0 S \p 0  H 0 0޽h ? ___f3̙;/f9___PPT10i.R +D=' = @B +} 0 4$(  4r 4 S }``   r 4 S }@   H 4 0޽h ? ___f3̙;/f9___PPT10i.S nF+D=' = @B + 0 D:(  Dr D S ``    D S `   "hu=H D 0޽h ? ___f3̙;/f9___PPT10i.V )+D=' = @B +} 0 0L$(  Lr L S  `}   r L S  `  H L 0޽h ? ___f3̙;/f9___PPT10i.X `te+D=' = @B +} 0 @P$(  Pr P S 2`0.   r P S 2p   H P 0޽h ? ___f3̙;/f9___PPT10i.Y ^;+D=' = @B + 0 : 2 < (  <X < C 8   2  < S 8 0   z Traditional virus  damages data by wiping out or altering Worms  First worm was created by Robert Morris on Nov. 2, 1988. He was a grad student at Cornell. According to Morris, it was written to guage the size of the Internet, not to cause damage. Now he is an associate professor at MIT. Trojan Horse comes from a Greek story of the Trojan War where the Greeks offered a gift to their enemies, the Trojans, of a giant wooden horse. After the Trojans drag the horse inside their city, Greek soldiers who were hiding inside the horse, sneak out, open the city gates, and allow their fellow soldiers to capture the city of Troy. Email virus  replicates by mailing itself to email addresses in the victim s address book Melissa Virus  3/99  Microsoft Word documents; would send itself to first 50 people in address book; fastest spreading virus ever; caused shut-down of email I LOVE YOU Virus  5/4/2000  Trojan Horse distributed via email. Used Visual Basic for Applications (which could do things like modify files and send email as well as auto-execute which allowed the programmer to insert a program into a doc. That runs automatically when the doc is opened). When the attachment was opened it would activate the virus by sending 50 emails and then infect a central file called NORMAL.DOT so any file saved later was also infected.>Z>tH < 0޽h ? 3380___PPT10.T !O0 & H(  HX H C 8    H S 08 0   6  make sure that Macro Virus Protection is enabled in all Microsoft applicationsH H 0޽h ? 3380___PPT10.X `#0 .&PT(  TX T C 8   & T S 8 0   Free file sharing programs are frequently a major conveyor of adware) Old antivirus software did not scan for adware and spyware because they did not consider them viruses or worms because 1) you give permission to install adware (although you do it unwittingly) and 2) adware does not behave like typical virus or worm since it doesn t actually do damage other than affecting performance Pop-up blockers to prevent adware and spyware: MSN Toolbar and Google Toolbar To check your computer: use a scanner  software specifically designed for detecting adware and spyware and helping you to remove it E.g., Ad-aware from Lavasoft>*_)v2H T 0޽h ? 3380___PPT10.Y FLrD ;FTWZ\$_aNk.dfxNiC{1Oh+'0 hp  Telnet Ellen HeppEdgeRaymond Greenlaw2Microsoft Office PowerPoint@`ejW@`L99M @PrG\g  &  y--$xx--'̙-- % % --'̙--%"EE--'@Garamond-. f32 &Telnet and FTP."System-՜.+,0L    On-screen Showie  Arial GaramondTimes New Roman WingdingsEdgeTelnet and FTPTelnetrshsshFTPVirusesViruses - PreventionAdware and SpywareAdware and Spyware - (cont)  Fonts UsedDesign Template Slide Titles (_ERaymond GreenlawRaymond Greenlaw  !"#$%&'()*+,-./0123456789:;<=>?@ACDEFGHIKLMNOPQSTUVWXY\Root EntrydO)Current UserRSummaryInformation(BPowerPoint Document(iDocumentSummaryInformation8J