powershell-ssh-key

$path = "Path\to\your\ssh_key.pem"

#Get current ACL to file/folder
$acl = Get-Acl $path

#Disable inheritance and remove inherited permissions
$acl.SetAccessRuleProtection($true,$false)

#Remove all explict ACEs
$acl.Access | ForEach-Object { $acl.RemoveAccessRule($_) }

#Create ACE for owner with read-access. You can replace $acl.Owner with $env:UserName to give permission to current user
$ace = New-Object System.Security.AccessControl.FileSystemAccessRule -ArgumentList $acl.Owner, "Read", "Allow"
$acl.AddAccessRule($ace)

#Save ACL to file/folder
Set-Acl -Path $path -AclObject $acl