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Secure Socket Layer (SSL) Virtual Private Networks (VPNs) enable secure, remote access to business networks. Because they open business networks to remote users, it is essential to control and monitor access to SSL VPNs. User authentication for the VPN is frequently the weakest link of the secure remote connection. Requiring only a user ID and password to connect to the SSL VPN is risky. Password-only authentication is easily defeated by phishing attacks, keystroke tracking, man-in-the-middle attacks, and sometimes simple guessing.
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