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Dictionary attacks against Internet servers that provide the Secure Shell (SSH) service for secure, remote login is very common. The dictionary attack is an attempt to gain unauthorized access to a server by continuously guessing username and password pairs using sophisticated brute force techniques. Solutions exist that can detect and prevent this attack for a local host. However, a technique that distributes the detection and prevention information to a server's trusted neighbors can provide a gain in security by way of preemptive protection.
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