Why one-time passwords suck for MITM attacks->
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whitehartstag
whitehartstag writes "Black Hat 08 disclosed several SSL VPN and DNS vulnerabilities that caused several people to sit up and take notice. Some of these new exploits performed a brilliant Man-In-The-Middle attack on SSL VPN tunnels. This article walks you through how using certificates, instead of OTP tokens for second-factor authentication can increase the security of your SSL VPN against these new types of attacks."
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Why one-time passwords suck for MITM attacks