A renowned hedge-fund honcho hatched a heinous revenge plot against his former mistress by posing as her on the Internet — saying she wanted to be kidnapped and raped as part of a sick sex fantasy, officials said Monday.

Albert Hsu, 43, a wealthy, married dad of two and former Cub Scout leader, posted his fiendish ad on a hardcore, S&M Web site, Connecticut authorities said.

He allegedly included the woman's name, photo, address, license-plate number, train schedule to and from work and even the rail car she usually sits in.

"The defendant set the victim up to be abducted and raped by a complete stranger," prosecutor Ricki Goldstein said in Norwalk, Conn., Superior Court.

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