Is crypttab secure to automount a partition?

I am a newbie with this so go gentle please :-) I want to automagically
mount a partition at boot. Is it secure to use the crypttab key field? I
assume I would have to store the passphrase plain texting the file
specified in the key field, and since as I understand it the point of
partition encryption is to prevent a malicious local user with physical
access from reading the files, if the user can read the file specified in
the key field, wouldn't they then be able to decrypt the partition? Seems
to me like leaving the front door key under the doormat, but maybe I'm just
ignorant how it works. Please educate this newbie.

Christopher de Vidal

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