Certificates format widely accepted, PEM (Privacy Enhanced Mail) Governed by RFCs, it's used preferentially by open-source software. Most common format used for certificates Private Key : YES, Private key in seperate file. Format : Base64 encoded ASCII files Extensions : .cer, .crt, .pem, .key DER (The parent format of PEM.) All types of certificates & private keys can be encoded in DER format. DER formatted certificates when opened in editor do not contain the BEGIN CERTIFICATE or END CERTIFICATE. Private Key …