"Are you concerned about brute force dictionary attacks on SSH?
Given the popularity of these attacks, you should be. sshguard is a
new tool to help protect against such attacks. Although it is still
in beta stage, it appears to work well.
"OpenSSH provides a secure alternative to clear-text logins used
by first-generation network protocols like Telnet and FTP. But it's
not enough simply to use SSH instead of Telnet--you have to use it
wisely. If you use weak passwords with SSH, a brute force
dictionary attack will reveal your secrets as easily as if your
password were sent in clear text.
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