Certificate criteria

Certificates must meet several criteria.

A valid certificate must meet these criteria:
  • The certificate can have a key size up to 2048 bits.
  • The certificate must have one of these file extensions:
    Table 1. Certificate file extensions
    Extension Description
    DER The Distinguished Encoding Rules format is a binary message transfer syntax. This format also supports the .CER and .CRT file extensions.
    CER A certificate file extensions for certificates using the Distinguished Encoding Rules format.
    CRT A certificate file extensions for certificates using the Distinguished Encoding Rules format.
    PEM The Privacy Enhanced Mail format is a base-64 encoded DER certificate enclosed between "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----" text strings.