Study

An SSH key the client refuses to use

You have copied a private key onto a new machine and SSH will not touch it. The error mentions permissions. Work out what is wrong and fix it, then make sure the same mistake does not repeat for files you create later.

First, look at the key and its directory so you can see the modes rather than guess at them. What do you run?

Command
The listing shows the key as -rw-r--r--. SSH refuses a private key that any other account can read. Set it so only its owner can read and write it.
```
-rw-r--r--  1 you you 411 Aug 14 09:12 id_ed25519
-rw-r--r--  1 you you  98 Aug 14 09:12 id_ed25519.pub
```
Command
The directory is drwxr-xr-x, which lets others list your key names. Restrict it to its owner.

Command
Finally, make new files private by default in this shell, so the next key you copy does not land world-readable in the first place.

Command