Self-Signed Certificate

Updated 25 Jul 2026

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def
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  a certificate that is not signed by any certificate authority hierarchy at all — it signs itself; internal certificates don't need to be signed by a public CA if only your own organization is going to use them
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limitation
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  only valid/trusted for that organization's own use — generally used for non-internet-connected networks
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  an outside device connecting to a network that uses a self-signed certificate will get an "invalid certificate" warning, since no external party vouches for it
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related

Linked references 4