Little Snitch 怎么样
Assuming you’ve downloaded the Little Snitch Disk Image (.dmg file) to your Downloads folder, open a new Terminal window and enter the following command to verify the cryptographic signature of the downloaded file:
codesign --verify -R='anchor apple generic and certificate leaf[subject.OU] = MLZF7K7B5R' ~/Downloads/LittleSnitch*.dmg
Little Snitch warns about potential consequences when you deny a connection and Little Snitch knows the purpose of the connection. Since this warning may be annoying, it can now be disabled on a per-application basis. Added support for additional remote endpoint types in the Internet Access Policy. Windows系统上有没有类似Little Snitch的防火墙软件？ OS X上Little Snitch（Little Snitch 3 ）防火墙可以查看每一个软件正在连接的地址，而且可以设置规则，让指定的软件只能连接到指定的地址和端口。.
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If the result of this command is empty (no error message is shown), the file is intact and properly signed by Objective Development.
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However, if an error message is shown (like “not signed at all” or “failed to satisfy specified code requirement(s)”), this indicates that the file was maliciously modified and is no longer signed by Objective Development. In that case you should NOT open the disk image file.