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I accidentally came across the keychain certificate part of my Mac and saw Department of Defense certificate. What is this certificate doing on my laptop. I am not a military member and never had any email account with them. I am not comfortable with this certificate on my laptop and for now I turned it off.

  • 1
    Why? Don't you trust the DoD? – user207421 Feb 28 '17 at 11:12
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    @EJP Actually I don't even trust Apple and Microsoft but I have to use their products :-) – Amin R. Feb 28 '17 at 13:35
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It's one of the trusted certificate authorities for at least OS X Mavericks (10.9) through OS X El Capitan (10.11), so under those OS versions it'll be in the System Roots keychain. It was apparently removed in macOS Sierra (10.12); I don't know why. Apple publishes the lists of trusted CAs; see Support Document HT202858: "Lists of available trusted root certificates in macOS" for links to the full lists.

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