HT1338 When we check for updates, how do we know they are valid and not malware?

When we check for updates, how do we know they are valid and not malware?

If they are from Software Update they are valid.
You can also go to
http://support.apple.com/downloads/
Then click on the app (not download it) and you will see this...
http://support.apple.com/kb/DL1426 and check the security SHA.

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