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What permissions should each file under .ssh have? I just experienced some glitch caused by .ssh/config not having 600. What permissions other files there should have?

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From man ssh_config:

~/.ssh/config
This is the per-user configuration file. The format of this file is described above. This file is used by the SSH client. Because of the potential for abuse, this file must have strict permissions: read/write for the user, and not accessible by others.

Your private keys and your authorized_keys file should have the same (600) but your public keys can have a more permissive 644.

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