[X-Unix] How secure is OS X storage of Unix passwords

[Kuestner, Bjoern]

Keychain holds a lot of passwords for OS X users: Web site access, disk
images, etc.

Most users have only their default keychain which is protected by their
login password.

Where and how secure does OS X store login passwords?

I understand OS X loads /etc/passwd into the netinfo DB. 

Does OS X use the same standard "crypt" algorithm from traditional unix?

Is that really only 56-bit long as I read on several web pages on the
subject?

What good is then having sensitive data on the laptop within a 128-bit-key
encrypted disk image?

Thanks,

Björn










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