Spam and Individual Security.


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Email spam records are made by examining Usenet postings, taking Internet mailing rundown, ... email locations originates from looking the email servers of huge email facilitating ...
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Spam and Personal Privacy Presented by: Ashley Embry

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Outline What is Spam? A. Sorts of Spam Where Did the Word "spam" Originate? How Spam Begins: A General Explanation Who Has the Potential to be a Spammer? Insights About Spam Getting Rid of Spam Breakdown of a Spam Filter Conclusions Questions for the class

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What is Spam? There are numerous meanings of spam that are utilized. Electronic garbage mail or garbage newsgroup postings. Any spontaneous mechanized email. Email publicizing for some item sent to a mailing list or newsgroup. Spam is just flooding the web with numerous duplicates of the same message trying to constrain the message on individuals who might not generally get it.

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Types of Spam There are two primary sorts of Spam: 1. Usenet Spam is gone for individuals who read newsgroups yet infrequently or never post and give their data away. 2. Email spam targets singular clients with post office based mail messages. Email spam records are made by checking Usenet postings, taking Internet mailing list, or scanning for locations.

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Where Did the Word "spam" Originate? The historical backdrop of calling unseemly postings in extraordinary numbers "spam" is from a Monty Python drama where a couple goes into an eatery and the spouse tries to get an option that is other than Spam. Out of sight there is a gathering of Vikings who are singing the commendations of Spam. Truly soon the main thing that you can hear is… Like the tune spam is the interminable redundancy of useless content.

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Another proposition is that "spam" was considered by a PC lab bunch at the University of Southern California, who gave it the name since it has huge numbers of the same qualities as the lunch meat Spam. No one needs it or ever requests it. Nobody ever eats it; it is the primary thing to be pushed to the side when eating the entrée. Now and again it is really divine, similar to the 1% of garbage mail that is truly valuable to some individuals.

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How Spam Begins: A General Explanation Spammers just need access to your location. After that its simply a question of sending the messages. The essential sources that spammers use are newsgroups and visit rooms. The second source utilized is the Web itself. Spammers can make web crawlers that search for the @ sign which shows an email address. The third source is locales made particularly to pull in email beneficiaries. "Win $1 million!!! Simply Click Here!" " Would you like bulletins frame our accomplices"

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Finally, presumably the most widely recognized wellspring of email locations originates from seeking the email servers of substantial email facilitating organizations like Hotmail. The Hotmail article "A Spammer\'s Paradise" peruses: A word reference assault uses programming that opens a connection to the mail server and quickly submits a great many arbitrary e-mail addresses. Large portions of these locations have slight varieties, such as "jdoe1abc@hotmail.com" and jdoe2def@hotmail.com. The product then records the location areas and adds those locations to the spammer\'s rundown. These rundowns are commonly exchanged to numerous different spammers .

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Who Has the Potential to be a Spammer ? Anybody can be a spammer. Situation Let\'s say your grandma prepares the best banana nut bread ever made, and you need to offer the formula for $5. You have 100 individuals in your own email address book. You convey an email promoting, "Huge Momma\'s Nana Nut Bread - just $5 !!!" From your 100 messages you get 2 requests and make $10. Suppose you had conveyed 1,000,000 messages…

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Statistics About Spam In a solitary day in May, the No. 1 network access supplier AOL Time Warner (AOL) blocked 2 billion spam messages—88 for each supporter—from hitting it\'s clients email accounts. Microsoft (MSFT) which works the No.2 administration supplier MSN and Hotmail says it obstructs a normal of 2.4 billion spams for every day.

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Getting Rid of Spam Avoid giving out your email location to new or obscure beneficiaries. Utilize your email application\'s sifting highlights. Report the spam e-mailer to the spammer\'s ISP. Use spam separating programming.

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Breakdown of a spam channel Most spam blockers use channels that scan for regularly utilized expressions or composing styles that are excessively forceful and found in mass email promoting. Spammers attempt to trick the channels by changing their written work styles and organizations so that their messages can sneak past the channels. The best innovation as of now accessible to stop spam will be spam sifting programming. The least complex channels use watchwords, for example, "xxx," "viagra," and so on, however they are additionally more prone to obstruct the messages that you would like to get.

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Example The more propelled channels, Bayesian channels for instance, take this methodology further to factually recognize spam in view of recurrence. A case of how this measurable sifting functions: Start with one gathering of spam and one of nonspam mail, and every accumulation had around 4000 messages in it. Check the whole content of every message of the gathering. Consider alphanumeric characters, dashes, punctuations, and dollar signs to be as a feature of tokens (words) and everything else to be a token separator. (i.e. qt234abc, $75, u\'tt) Count the quantity of times every token happens in every message. You will wind up with two vast tables with every one demonstrating the diverse tokens and how frequently it showed up in the messages.

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Finally, make a third table that relates the token to the likelihood (going from .01 to .99) that an email containing it is a spam. At the point when new mail arrives now, it is examined into tokens, and the fifteen tokens whose probabilities are the most distant from the impartial likelihood of .5 are then used to compute the likelihood that the email is a spam.

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Algorithms/Program dialect To decide likelihood of the token being in a spam: let ((g (* 2 (or (gettable token great) 0 )) (b (or (gettable token terrible) 0 )) (unless (< (+ g b) 5) (max .01 (min .99 (skim (/(min 1 (/b nbad)) (+ (min 1 (/g ngood)) (min 1 (/b nbad)))))) To figure out whether the email is a spam utilizing the probabilities of the 15 picked tokens: let ((goad (apply # " * probs))) (/nudge (+ push (apply # " * (mapcar # " (lambda (x) (- 1 x)) probs))))

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Example token rundown with probabilities: madam 0.99 promotion 0.99 shortest 0.047225013 sorry 0.0499 valuable 0.82347 *information taken from www.paulgraham.com

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Wrapping it Up Whether developing a spam list or executing a spam separating program, spam depends on the idea and use of software engineering.

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Questions for the Class By the end of this presentation you ought to have the capacity to answer the accompanying inquiry: Name 2 strategies we learned in CIS class that are utilized by spammers or as a part of spam sifting. Design Matching when hunting down email addresses or when assessing words for spam propensities. Composing calculations to in the long run execute program.

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Bibliography "Before Spam Brings the Web to Its Knees." June 10, 2003. http.//www.businessweek.com/innovation/content/jun2003/tc20030610_1670_tc104.htm Brain, Marshall. "How Spam Works" http://computer.howstuffworks.com/spam.htm "Disposing of Spam" http://www.webopedia.com/DidYouKnow/Internet/2002/GettingRidofSpam.asp Graham, Paul. "A Plan for Spam." Aug.2002. http://www.paulgraham.com/spam.html

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Mueller, Scott H. " What is Spam?" http://spam.abuse.net/review/whatisspam.shtml "Sources of Spam" http://digital.net/~gandalf/spamfaq.html#item8c "Spam" July 20, 2004. http://www.webopedia.com/TERM/s/spam.html

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