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SPAM. BY: Richard Crawford. What is Spam?. Spam is the abuse of electronic messaging systems to send unsolicited bulk messages indiscriminately. EMP (Excessive Multi Posting) ECP (Excessive Cross Posting) UBE (Unsolicited Bulk E-mail) UCE (Unsolicited Commercial E-mail).
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SPAM BY: Richard Crawford
What is Spam? • Spam is the abuse of electronic messaging systems to send unsolicited bulk messages indiscriminately. • EMP (Excessive Multi Posting) • ECP (Excessive Cross Posting) • UBE (Unsolicited Bulk E-mail) • UCE (Unsolicited Commercial E-mail)
Why is it called Spam? • Monty Python’s Flying Circus • Season 2 • Spam Skit
Types of Spam • Email Spam • IM Spam • USENET Newsgroup Spam • Web Search Engine Spam • Blog Spam • Wiki Spam • Mobile Phone Messaging Spam
What is wrong with Spam? • Phishing • Stealing Personal Information (Identity Theft) • Malware • Infiltrate Your Computer • Loss of Productivity • 5 Seconds to check and delete a spam message • Average of 50-75 per day • 3% of your daily life
Content-Based Spam Detection • content filtering is the most commonly used group of methods to filter spam. Content filters act either on the content, the information contained in the mail body, or on the mail headers (like "Subject:") to either classify, accept or reject a message. • The most popular filter is the Bayesian Filter, which is a statistical filter.
Bayesian Filter • Where: • Pr (S/W) • is the probability that a message is a spam, knowing that the word "replica" is in it; • Pr (S) • is the overall probability that any given message is spam; • Pr (W/S) • is the probability that the word "replica" appears in spam messages; • Pr (H) • is the overall probability that any given message is not spam (is "ham"); • Pr (W/H) • is the probability that the word "replica" appears in ham messages
What the Heck does that Mean? • Message is scanned • Message is given a score • Based on the score email is marked accordingly • The higher the score the more likely the message is spam • Algorithm assumes that 80% are spam
Advantages / Disadvantages • Trained on a per user basis • Based off users online activities • Number of legitimate emails will tend to be different • Word Probabilities are unique to each user • Very good at avoiding False positives • Susceptible to Bayesian Poisoning • Replacing text with Pictures
Spam Filters are your Friend • POPFile • eXpurgate • SpamPal • MailWasher Pro • Spamihilator
POPFile powerful and flexible email classification POP and NNTP proxy that you can use to filter spam efficiently and categorize good mail automatically.
eXpurgate effortless but highly effective spam (and virus) filtering service.
SpamPal SpamPal makes it easy to use spam blacklists with any email account.
MailWasher Pro MailWasher Pro is a highly competent, usable, secure and time-saving spam filtering tool. Combining multiple approaches, MailWasher Pro achieves a solid spam detection rate and protects you from viruses to some extent, too.
Spamihilator Spamihilator is a pretty, easy to use anti-spam tool that works with any email client and, thanks to Bayesian filters, has a good detection rate.
What Can I do? • Use Multiple email address • Personal • Business • Spam • Gmail • Never just delete • Report as Spam • Never open an email that you think is spam
Conclusion You cant stop Spam You can only decrease it When in doubt mark as Spam Remember the 3 P’s Pills Porn Poker
THE END Any Questions?
