Sphinx was a monster in Greek mythology devouring those who could not solve her riddle. In VoIP, a new service in the role of Sphinx provides protection against SPIT (Spam over Internet Telephony) by discriminating human callers from botnets. The VoIP Sphinx tool uses audio CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) that are controlled by an anti-SPIT policy mechanism. The design of the Sphinx service has been formally verified for the absence of side-effects in the VoIP services (robustness), as well as for its DoS-resistance. We describe the principles and innovations of Sphinx, together with experimental results from pilot use cases.
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机译：狮身人面像是希腊神话中的怪物，吞噬了那些无法解决她谜语的人。在VoIP中，充当狮身人面像角色的一项新服务通过区分人为呼叫者与僵尸网络来提供针对SPIT（互联网电话上的垃圾邮件）的保护。 VoIP Sphinx工具使用由反SPIT策略机制控制的音频CAPTCHA（完全自动化的公共Turing测试，以告诉计算机和人类以外）。 Sphinx服务的设计已被正式验证，以确保VoIP服务中没有副作用（鲁棒性）以及其DoS抵抗性。我们描述了Sphinx的原理和创新，以及试点用例的实验结果。
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