Arquivo da chave veio .cer

Olá professor,

A key pair veio como .cer e não .pem e eu não estou conseguindo acessar a maquina, tentei mudar no comando o nome para .cer, mas também não foi, segue o log do terminal abaixo:

marcelloruoppolo@MacBook-Pro-de-Marcello ~ % cd Desktop

marcelloruoppolo@MacBook-Pro-de-Marcello Desktop % ssh -i "peezy.pem" [email protected]

Warning: Identity file peezy.pem not accessible: No such file or directory.

The authenticity of host 'ec2-52-90-89-235.compute-1.amazonaws.com (52.90.89.235)' can't be established.

ED25519 key fingerprint is SHA256:HpO5IO4nBXimKMhFF3qTNyq5O+9A4nHsUf5x0Nk6FZE.

This key is not known by any other names

Are you sure you want to continue connecting (yes/no/[fingerprint])? yes

Warning: Permanently added 'ec2-52-90-89-235.compute-1.amazonaws.com' (ED25519) to the list of known hosts.

[email protected]: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

marcelloruoppolo@MacBook-Pro-de-Marcello Desktop % ssh -i "peezy.pem" [email protected]

Warning: Identity file peezy.pem not accessible: No such file or directory.

[email protected]: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

marcelloruoppolo@MacBook-Pro-de-Marcello Desktop % ssh -i "peezy.cer" [email protected]

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

Permissions 0644 for 'peezy.cer' are too open.

It is required that your private key files are NOT accessible by others.

This private key will be ignored.

Load key "peezy.cer": bad permissions

[email protected]: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).