Execution Gatekeeper (macOS)

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when user attempts open application such attribute, system delay execution , verify whether is:



blacklisted,
code-signed,
code-signed apple or certified developer,
code-signed , code-signed contents still match signature.

since mac os x snow leopard, system keeps 2 blacklists identify known malware or insecure software. blacklists updated periodically. if application blacklisted, file quarantine refuse open , recommend user move trash.


gatekeeper refuse open application if code-signing requirements not met. apple can revoke developer s certificate application signed , prevent further distribution.


once application has passed file quarantine or gatekeeper, allowed run , not verified again.








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