This guide points out the major differences between PEM and DER files and common filename extensions associated with them. However, there is some overlap and other extensions are used, so you can’t always tell what kind of file you are working with just from looking at the filename you may need to open it in a text editor and take a look for yourself.Īs you work with digital certificates, you may find yourself with the need to convert between PEM and DER files, view their contents as human-readable text, or combine them into common container formats like PKCS#12 or PKCS#7. These extensions generally map to two major encoding schemes for X.509 certificates and keys: PEM (Base64 ASCII), and DER (binary). You may have seen digital certificate files with a variety of filename extensions, such as.
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