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A dictionary attack against SSH is a common security threat. Many published ways rely on network traffic to detect SSH dictionary attacks. This is because the connections of remote login, file transfer, and TCP/IP forwarding are visibly distinct from those of the attacks. However these ways incorrectly consider the connections of automated tasks as those of the attacks because of the mutual similarities...
SSH services are run on many hosts with various scopes other than just operation, so dictionary attack against the service is a common security threat. SANS has reported the emergence of distributed SSH dictionary attacks, which are very stealthy in comparison with a simple one. Since even one success of such an attack causes serious problems, administrators should implement countermeasures. SSH dictionary...
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