Cryptography - CER file format (Certificate)

> Software Security > Cryptography - Key

1 - About

.CER files are certificate file format.

They have the public key, they don't have the private key in a Public Key Cryptography model

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3 - Example

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----