Secure SSH in iPhone

After install OpenSSH in iPhone from Cydia, OpenSSH will keep running in background if you don’t do anything.  It has huge risk to your iPhone because everyone can access to all files, including system files, in your iPhone once the iPhone joint a WiFi.
There are two ways to secure your iPhone from SSH
1. Install SBSettings
    SBSettings has a toggle, which can turn on and off SSH
2. Change the default password of OpenSSH
    Install MobileTerminal
    Enter command
    passwd
    Then it will ask for the old password, it is the one you using to login SSH, alpine, for 3GS
    Then it will ask for the new password twice.
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