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 Certificate file extensions for certificates using the Distinguished Encoding Rules format.
    CRT 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.