Improvement on the anti-VoIP spam mechanisms using Reverse Turing Test
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Abstract
- Voice-Spams have been one of a major threat of Internet telephony services not only annoying users but being a tool for some electronic criminals also. Since, voice-spam is a suite of automated voice that will call for any purposes without permission of callees. We thus propose an improvement on the anti-VoIP spam mechanism using Reverse Turing Test to prove whether the call is from human or not before reaching the recipient. If it is a call from human, system will forward the call and the username belonging to the call will be recorded in white list, not be tested for next time calling. On the other hands, if the test indicates that calls is not from human, system will mark it as a spam then call is not forwarded and username will be recorded in black list, calls will be dropped for next time calling.
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References
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3. M. Hirschbichler, et al., "Using E-Mail SPAM DNS Blacklists for Qualifying the SPAM-over-Internet-Telephony Probability of a SIP Call," in Digital Society, 2009. ICDS '09. Third International Conference on, 2009, pp. 254-259.
4. CAPTCHA. สามารถเข้าถึงข้อมูลได้จาก : http://en.wikipedia.org/wiki/CAPTCHA.
5. “Spamhaus Block List.”, สามารถเข้าถึงข้อมูลได้จาก : http://www.spamhaus.org/whitepapers/dnsbl_function.html