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Wed, Jan 25, 2017 11:08 pm

Extracting information from a pem file

The X.509 standard is used to manage digital certificates used for public key encryption. One of the filename extensions used for X.509 certificates is .pem, which stands for "Privacy Enhanced Mail". These certificates are Base64 encoded DER certificates. If you have a .pem certificate and want to view information about the contents of the certificate, you can do so with OpenSSL software, which is commonly found on Linux and Mac OS X systems, but is available for other operating systems as well. If you just want to view the expiration date for a certificate you can use an openssl command like the one below:

$ openssl x509 -enddate -noout -in cacert.pem
notAfter=Aug 13 23:59:00 2018 GMT
$

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[/security/encryption/openssl] permanent link

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