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Image spam Hard for a computer to read Hi growth from 0 to 25% of spam Getting your email address Dictionary attack Spam bots (websites) Infected computers Vendors/subscriptionsV%$ <QV%$  <QSpam Safety tips:Encrypt your email address (not in a dictionary) Use a fake email address where possible Use bcc to send an email to many people Don t open spam and set Outlook Express to  Block images& .. Avoids confirming your email Don t reply to spam  again it confirms you re real! Don t post your email address on a website. Uncheck all those  subscribe boxes Unsubscribe from reputable companies only Use a spam filter (  Spam Filtering Techniques`Rules based Matches specific words in the To, From, Subject or Body of the email Very specific  can only make an exact match Bayes filter/Fuzzy logic Uses a mathematical set of probabilities, gathered from being told what s  spam and what s  ham Needs to  learn and kept up to date Black list Blocks specific  From addresses. Not very effective today  new domain every 4 hours! Good for blocking family/friends or newsletters r #50 r #  5  0  ~. !Spam Filtering Techniques (cont.)On-line Database (DNSBL) Can work well - if accurate. Can easily stop legitimate emails as well. Signature analysis for specific emails White list List of email addresses you will accept email from Challenge/response systems Needs to be kept up-to-date Most effective methodLo o  Reducing Spam in Real Life!`Different if using Web mail or POP mail Web mail is when you use your internet browser (Internet Explorer or Firefox, etc) to read and send your email. POP mail is when you use an email client (a program such as Outlook/Express, Thunderbird, Endura, etc.) to read and send your email. With POP mail, the email messages are downloaded to your computer  can be read and new ones composed, without beeing connected to the internet. To read or compose messages in Web mail, you must be connected to the internet Many email accounts can be accessed by either/both&( ( >m~ Web MailAll your email stays on the Web mail server You have little control Large providers such as Yahoo, Google, Hotmail, etc. provide excellent spam filtering  using a combination of all the above techniques Any legitimate emails in the spam/junk box, must be identified  now added to your white list Yahoo has AddressGuard Create a separate email address for each person or class of persons Many of the smaller ISP s/email providers, aren t as sophisticated.N,DD,DD4   POP 3NSpam filter sits between the mail server and your email client Many ISP s or email servers have own spam filter Yahoo (SBC, AT&T, Pacbell, etc.) use same as Web mail Can be harder to check spam folder  may need to configure Huge selection of programs  freeware to $$ s http://spamlinks.net/filter-client-win.htm Use different techniques  either singly or in combination. Some are tightly integrated to the email clientd?1q?1q/+m,*n >0: POP3/Outlook Express ExamplesOutlook Express  Rules Text matching  limited Good for White list  can import address book K-9 Freeware Uses Bayesian technology  so must train Plus has White list and Black list Regex filters for advanced users Easy interface  but not elegant Computer Associates ($30) White list Integrated to Outlook/Express  easy to usetF 7F 7   More ExamplesMailWasherPro ($30) Freeware version available Combination of Bayes, White list, Black list, DNSBL, User filters and Signature Reviews email on the server Spam is removed before download Save time with dial up Easy to useN7 7 $ 1 Phishing Scams to trick users to reveal personal information Normally an official looking email Directed to a fraudulent website 2004 2006 Losses from phishing attacks: $137 million $2.8 billion # US adults who received at least one phishing e-mail: 57 million 109 million Number of victims: 53 thousand 2.25 million Per-victim loss: $257 $1,244 Money recovered by consumers: 80% 54% Don t click a link in an email Call your bank or credit card company if suspicious Check the website is secure (https://xxxxx)4P  4P:  Useful Links6http://en.wikipedia.org/wiki/Spam_e-mail Wikipedia Reference http://spam.abuse.net/userhelp/ Links to resources and anti-spam filters http://spamlinks.net/ More links to many anti spam resources http://spamlinks.net/filter-client-win.htm (More spam filters) http://spam-filter-review.toptenreviews.com/ Review of some spam filters http://keir.net/k9.html Freeware Bayes filter (plus White and Black list) http://shop.ca.com/STContent/landingpages/Antispam/ASPM001/index.aspx?sc_lang=en-US Computer Associates anti spam program (Or Google ca spam). Paid, easy to use White list  integrates to Outlook Express. http://www.mailwasher.net/ Mail Washer free and paid anti-spam versions. Uses multiple methods for detection http://www.spambutcher.com/ Spam Butcher  fuzzy logic anti-spam (,)*,4S{U'*  + (* #TzT'>0(>0=]>0>0>04>0Qi>0>0j >0Summary&Web mail Dependant on the ISP/Web mail provider Larger providers often provide configurable options Yahoo AddressGuard is a good solution MUST go into JUNK/BULK/SPAM folder to mark good emails  regularly POP3 mail Most effective method is White list (or safe senders list)  but needed to be kept up-to-date. Using built in Rules of Outlook Express works fine Purchased product  often more convenient.L   j ( 0` ̙33` ` ff3333f` 333MMM` f` f` 3` fff833 p>?" dd@?nZ8d2@!% lUtZd n?" dd@   @@``PN    @ ` `$pH @`H @` ^N0   @ p (    Z1?#"  g  N? ?#" ` <$0  GClick to edit Master text styles Second level Third Level Fourth Level!  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fff83ff___PPT10..A`s+hD' = @B D' = @BA?%,( < +O%,( < +Da' =%(%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*4%(D* ' =%(D' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*4 D' =1:Bvisible*o3>+B#style.visibility<*4 %(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*4 QD' =1:Bvisible*o3>+B#style.visibility<*4 Q%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*4Q~D' =1:Bvisible*o3>+B#style.visibility<*4Q~%(D* ' =%(D' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*4~D' =1:Bvisible*o3>+B#style.visibility<*4~%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*4D' =1:Bvisible*o3>+B#style.visibility<*4%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*4D' =1:Bvisible*o3>+B#style.visibility<*4%(D ' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*4)%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*4)L%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*4L%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*4%(+p+0+40 ++0+40 +H 0 ^N0 8(  8r 8 S  P   r 8 S     8 BX ?"6@ NNN?NA 0,$0 Important!: No spam filter is perfect. The worst thing is putting legitimate emails in your Spam/Junk/Bulk mail folder. It s essential to check this folder so you can receive your good email, as well as train the filter.6 lU2 !H 8 0޽h ? fff83ffJB___PPT10".J` +PQFD' = @B Dy' = @BA?%,( < +O%,( < +D' =%(DX' =%(D' =A@BBBB0B%()))D' =1:Bvisible*o3>+B#style.visibility<*8%(D' D=-s6Bwipe(down)*<3<*8%(D' =eB]0,0; 0.14,0.36; 0.43,0.73; 0.71,0.91; 1.0,1.0+4 8?fCB#ppt_x-0.25BCB#ppt_xB*Y3>B ppt_x<*8%(D' =mBe0.0,0.0; 0.25,0.07; 0.50,0.2; 0.75,0.467; 1.0,1.0+4 8?lCB?B'#ppt_y-sin(pi*$)/3CB?B*Y3>B ppt_y<*8%(D' =B0, 0; 0.125,0.2665; 0.25,0.4; 0.375,0.465; 0.5,0.5; 0.625,0.535; 0.75,0.6; 0.875,0.7335; 1,1+4 8?lCBB'#ppt_y-sin(pi*$)/9CB?B*Y3>B ppt_y<*8%(D' L=B0, 0; 0.125,0.2665; 0.25,0.4; 0.375,0.465; 0.5,0.5; 0.625,0.535; 0.75,0.6; 0.875,0.7335; 1,1+4 8?nCBB)#ppt_y-sin(pi*$)/27CB?B*Y3>B ppt_y<*8%(,D' =B0, 0; 0.125,0.2665; 0.25,0.4; 0.375,0.465; 0.5,0.5; 0.625,0.535; 0.75,0.6; 0.875,0.7335; 1,1+4 8?nCBB)#ppt_y-sin(pi*$)/81CB?B*Y3>B ppt_y<*8%(xD' =0l9 BBBpB*<3<*8%(D' =0l9 BBBB*<3<*8%())?D' =0l9 BBBB*<3<*8%( D' =0l9 BBBB*<3<*8%(:))?D' =0l9 BBBB*<3<*8%(jD' =0l9 BBBB*<3<*8%())?D' =0l9 BBBB*<3<*8%(D' =0l9 BBBB*<3<*8%(*))?+8+0+80 + 0^N0 <P(  <r < S P    < S @<$0  H < 0޽h ? fff83ff___PPT10..K` +s_ (D*' = @B D' = @BA?%,( < +O%,( < +DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*<(%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*<(D' =1:Bvisible*o3>+B#style.visibility<*<(%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*<D' =1:Bvisible*o3>+B#style.visibility<*<%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*<D' =1:Bvisible*o3>+B#style.visibility<*<%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*<1%(+8+0+<0 + 0 ^N0 @|(  @ @ S $P<$0    @ S $p<$0  H @ 0޽h ? fff83ff___PPT10..N`@XH+ˠD' = @B D' = @BA?%,( < +O%,( < +Da' =%(%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*@%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*@,%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*@,DD' =1:Bvisible*o3>+B#style.visibility<*@,D%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*@DD' =1:Bvisible*o3>+B#style.visibility<*@D%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*@*D' =1:Bvisible*o3>+B#style.visibility<*@*%(DT' =%(D' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*@*AD' =1:Bvisible*o3>+B#style.visibility<*@*A%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*@AD' =1:Bvisible*o3>+B#style.visibility<*@A%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*@%(+p+0+@0 ++0+@0 +k 0 ^N0 D|(  D D S &P<$0    D S ' <$0  H D 0޽h ? fff83ff___PPT10..O`P!|+ˠD?' = @B D' = @BA?%,( < +O%,( < +Da' =%(%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*D%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*D?%(D* ' =%(D' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*D?pD' =1:Bvisible*o3>+B#style.visibility<*D?p%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*DpD' =1:Bvisible*o3>+B#style.visibility<*Dp%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*DD' =1:Bvisible*o3>+B#style.visibility<*D%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*D<D' =1:Bvisible*o3>+B#style.visibility<*D<%(D~' =%(D&' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*D<xD' =1:Bvisible*o3>+B#style.visibility<*D<x%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*Dx%(+p+0+D0 ++0+D0 +&$ 0 ^N0 @\|(  \ \ S h9P<$0    \ S h:<$0  H \ 0޽h ? fff833 p!!___PPT10!..a` ++hD ' = @B D ' = @BA?%,( < +O%,( < +Da' =%(%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*\%(D* ' =%(D' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\D' =1:Bvisible*o3>+B#style.visibility<*\%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\/D' =1:Bvisible*o3>+B#style.visibility<*\/%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\/]D' =1:Bvisible*o3>+B#style.visibility<*\/]%(D' =%(D~' =%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\]jD' =1:Bvisible*o3>+B#style.visibility<*\]j%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\jD' =1:Bvisible*o3>+B#style.visibility<*\j%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\D' =1:Bvisible*o3>+B#style.visibility<*\%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\D' =1:Bvisible*o3>+B#style.visibility<*\%(D' =A@BBBB0B%(E5' =1B B`BPB,54*3>B ppt_c='`B@BPB<*\D' =1:Bvisible*o3>+B#style.visibility<*\%(Ds' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*\%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*\%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*\I%(+p+0+\0 ++0+\0 +z 0 ^N0 P`|(  ` ` S NP<$0    ` S O <$0  H ` 0޽h ? fff833 p___PPT10..b`R+ DN' = @B D ' = @BA?%,( < +O%,( < +Da' =%(%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*`%(D ' =%(D ' =%(D' =A@BBBB0B%(D