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Solutions to Spam

Solutions to Spam . ----Presented by Di Xu 17.12.2010. Agenda. Introduction Overview of Spam Solutions to Spam Conclusion. Introduction - Definition. Advertising material sent by email to people who have not asked for it.(Oxford dictionary)

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Solutions to Spam

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  1. Solutions to Spam ----Presented by Di Xu 17.12.2010

  2. Agenda • Introduction • Overview of Spam • Solutions to Spam • Conclusion

  3. Introduction -Definition • Advertising material sent by email to people who have not asked for it.(Oxford dictionary) • An electronic message is "spam" if (A) the recipient's personal identity and context are irrelevant because the message is equally applicable to many other potential recipients; AND (B) the recipient has not verifiably granted deliberate, explicit, and still-revocable permission for it to be sent(C) the transmission and reception of the message appears to the recipient to give a disproportionate benefit to the sender.

  4. Introduction -Characteristics • Too many recipients • No header or use forged header • Forged sender’s address • The content of email with specific HTML tag • The body of email consists of small font size • Email subject consists of email address or recipient name

  5. Overview of Spam-How to harvest email addresses • From web pages • By guessing & cleaning • From white and yellow pages • From a previous owner of the email address • Buying lists from others

  6. Overview of Spam -How to send Spam • webmail • Third-party computers • Open relays • Open proxies • Spammer viruses

  7. Solutions of Spam-For administrator of email system • IP Blocking • Blacklist • Whitelist • Greylist • Spam Filtering • Rule-based filter • Checksum-based filter • Content-based filter • Honeypot email address • Payment-based approach

  8. Solutions to Spam -IP Blocking • Blacklist: A blacklist is a list of known IP addresses that are used to send spam and the earliest anti-spam technology. • Disadvantage: cannot control emails from unlisted email addresses

  9. Solutions to Spam- IP Blocking • Whitelist: The method makes users may get email from trusted contacts or domain, but reject emails from not already known domain and contacts, which restricts communication • Disadvantage: • It is not a good solution to a big enterprise • It is not difficult for spammers to guess domain which is whitelisted

  10. Solutions to Spam -IP Blocking • Greylist: It is decided by not only IP address, but also some more information of e-mail like envelope data. If the e-mail is the first time sent to the e-mail account, it will be rejected. But the information of e-mail will be stored • Disadvantage: • greylist leads to deliver email in delay before resent email will be confirmed to send • some normal emails cannot be delivered

  11. Solutions to Spam-Spam Filter • Rule-based Filtering: Users can design the rules to filter e-mail • Disadvantage: • It is not flexible

  12. Solutions to Spam -Spam Filter • Checksum-based Filtering: sometimes referred to collaborative filtering. • distributed checksum clearinghouse(DCC) Vipul’s Razor • Disadvantage: • It costs a comparative high license fee • if spammers insert something unique invisible to the body of email, it will lead to different checksum

  13. Solutions to Spam-Spam Filter • Content filtering: the solution is content-based filters which scan the nature content of spam to measure whether it is spam or not • Disadvantage: • For some rare spam words, Bayesian could decrease the probability of the email is spam • It cannot filter email which consist of no words only image

  14. Solution to Spam- Honeypot Email Address • Honeypot Email address: It is forged email addresses which pollute spammers’ address database • Disadvantage: • It is difficult to • keep ideal situation

  15. Solution to Spam- Payment-based approach • Payment-based approach: the e-mail servers require payment to delivery e-mail to the recipients for the senders. But the payment can be the real currency or something else somehow like cost of senders’computing • Disadvantage: • The difficulty of the calculations required must be increased over time

  16. Solution to Spam - Other Anti-spam approach • SpamAssassin is one of the hybrid filtering methods. It uses content-based filter and real-time blacklists. • A system which uses whitelist, blacklist and content filter. • +

  17. Solutions to Spam -Legislation Enforcement • United States CAN-SPAM Act of 2003 • Canada Electronic Commerce Protection Act • Australia Spam Act 2003

  18. Solutions to Spam-Anti-spam behaviors for users • Select an Unusual E-mail Address • Disposable Addresses • Use Provided Filtering Systems • Never reply to Spam and never use the Unsubscribe Link

  19. Conclusion • Combination of different solutions could be the most effective solution • Anti-spam solutions do not only rely on anti-spam technology, but also users’ good behavior to protect their own email addresses

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