The format I focus on now is the PEM format. This certificate viewer tool will decode certificates so you can easily see their contents. A PEM file may contain just about anything including a public key, a private key, or both, because a PEM file is not a standard. See How to Upload the Public Key. The key must start with the following phrase. Fingerprint of the public key. Now, however, OpenSSH has its own private key format (no idea why), and can be compiled with or without support for standard key formats. See How to Get the Key's Fingerprint. Upload the public key from the key pair in the Console. .crt or .cer stands simply for certificate, usually an X509v3 certificate, again the encoding could be PEM or DER; a certificate contains the public key, but it contains much more information (most importantly the signature by the Certificate Authority over the data and public key, of course). PEM and PFX files usually carry the private and public key of a certificate. A PEM encoded file contains a private key or a certificate. Generate SSH Keys in PEM Format to Connect to a Public or On-Premises sFTP Server; ... Verify the key by opening the file in Notepad. In effect PEM just means the file contains a base64-encoded bit of data. Tenancy's OCID and user's OCID. To convert from one to the other you can use openssl with the -inform and -outform arguments. A PFX keystore can contain private keys or public keys. Some files in the PEM format might instead use a different file extension, like CER or CRT for certificates, or KEY for public or private keys. The PEM format has been replaced by newer and more secure technologies but the PEM container is still used today to hold certificate authority files, public and private keys, root certificates, etc. See How to Generate an API Signing Key. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. See Where to Get the Tenancy's OCID and User's OCID. In essence PEM files are just base64 encoded versions of the DER encoded data. ... the format is called PEM. Double check if AWS isn't asking for a (X.509) certificate in PEM format, … Most PEM formatted files we will see are generated by OpenSSL when generating or exporting an RSA private or public key and X509 certificates. Each one takes one of PEM, DER or NET (a dated Netscape format, which you can ignore).. You can change a key from one format to the other with the openssl rsa command (assuming it's an RSA key, of course): RSA key pair in PEM format (minimum 2048 bits). The label inside a PEM file represents the type of the data more accurately than the file suffix, since many different types of data can be saved in a ".pem" file. -----BEGIN PUBLIC KEY... Stack Exchange Network. PEM data is commonly stored in files with a ".pem" suffix, a ".cer" or ".crt" suffix (for certificates), or a ".key" suffix (for public or private keys). The PEM format is also used to store private keys and certificate signing requests (CSRs): A PEM-formatted private key will have the extension .key and the header and footer-----BEGIN RSA PRIVATE KEY-----and -----END RSA PRIVATE KEY-----. This parser will parse the follwoing crl,crt,csr,pem,privatekey,publickey,rsa,dsa,rasa publickey It's a very natural assumption that because SSH public keys (ending in .pub ) are their own special format that the private keys (which don't end in .pem as we'd expect) have their own special format too. Use this Certificate Decoder to decode your certificates in PEM format. 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