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Note: The PEM format is the most common format used for certificates. Extensions used for PEM certificates are CER, CRT, and PEM. They are Base64 encoded ASCII files. The HER format is the binary form of the certificate.
If the certificate is in text format, then it is in PEM format. You can read the contents of a PEM certificate (cert.CRT) using the 'OpenSSL' command on Linux or Windows as follows: OpenSSL x509 -in cert.CRT -text. If the file content is binary, the certificate could be either HER or pkcs12/PFC.
There are different formats of X. 509 certificates such as PEM, HER, PCs#7 and PCs#12. PEM and PCs#7 formats use Base64 ASCII encoding while HER and PCs#12 use binary encoding. The certificate files have different extensions based on the format and encoding they use.
PEM Format PEM is the most common format in which Certificate Authorities (CA) issue certificates. These are more widely used by Unix/Linux users. If you see “Prototype” present in a PEM format certificate it means that it is encrypted and these are called as base-64 encoded HER certificates.
cert file is a generic term for X.509 Certificate. In the Windows world, the PFC is password protected and should never leave the org. The CER file can be exported from the X.509 certificate as the public key.
In cryptography, X.509 is a standard defining the format of public key certificates. X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, the secure protocol for browsing the web. They are also used in offline applications, like electronic signatures.
Convert x509 to PEM. Openssl x509 -in certificate name. Cer -out form PEM -out certificate name.PEM. Convert PEM to HER. Openssl x509 -out form her -in certificate name.PEM -out certificate name.her. Convert HER to PEM. Convert PKCS7 to PEM. Convert PFC to PCs#8. Convert P7B to PFC.
Select Base-64 encoded X. Provide a location to save the certificate and a file name. Review the settings you selected and click Finish.
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