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맥 os로 실행중인데

결과적으로 나오는 코드가 강의에서 나오는 코드랑 달리 문제가 있는거 같습니다!

작성한 코드 및 에러 메세지

Last login: Tue Nov 8 14:19:26 on console

kangharu@ganghaluui-MacBookPro ~ % sudo chmod 400/Users/kangharu/Downloads/haru_mykey.pem

Password:

usage: chmod [-fhv] [-R [-H | -L | -P]] [-a | +a | =a [i][# [ n]]] mode|entry file ...

chmod [-fhv] [-R [-H | -L | -P]] [-E | -C | -N | -i | -I] file ...

kangharu@ganghaluui-MacBookPro ~ % ssh -i /Users/kangharu/Desktop/haru_mykey.pem ubuntu@3.34.143.3

The authenticity of host '3.34.143.3 (3.34.143.3)' can't be established.

ED25519 key fingerprint is SHA256:I/bq6ity5SE++PGk15yX7hvYwKBEI8g/1fRQQnmSlpQ.

This key is not known by any other names

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

Warning: Permanently added '3.34.143.3' (ED25519) to the list of known hosts.

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@    WARNING: UNPROTECTED PRIVATE KEY FILE!     @

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

Permissions 0644 for '/Users/kangharu/Desktop/haru_mykey.pem' are too open.

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

This private key will be ignored.

Load key "/Users/kangharu/Desktop/haru_mykey.pem": bad permissions

ubuntu@3.34.143.3: Permission denied (publickey).

kangharu@ganghaluui-MacBookPro ~ %