If you set POSIX permissions for only allowing access to the owner,using --file-perms 0600 --dir-perms 0700, the user group and the built-in"Everyone" group will still be given some special permissions, as describedabove. Some programs may then (incorrectly) interpret this as the file beingaccessible by everyone, for example an SSH client may warn about "unprotectedprivate key file". You can work around this by specifying-o FileSecurity="D:P(A;;FA;;;OW)", which sets file all access (FA) to theowner (OW), and nothing else.