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:

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For Mac keeps track of every app, background process, and service you run and allows you to restrict hard drive and network access. In addition to. Jun 23, 2017 brew cask install little-snitch; Done! You can now use Little Snitch. Similar Software for Mac. OSX, Yosemite, Mavericks, Mountain Lion, Lion, Snow Leopard. Aug 19, 2009  Since Little Snitch isn't Snow Leopard compatible due to Snow Leopard's new Core Location technology, even though I am using the most recent developer beta, I dont think its going to work anyway when the final version is released.

codesign --verify -R='anchor apple generic and certificate leaf[subject.OU] = MLZF7K7B5R' ~/Downloads/LittleSnitch*.dmg

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.