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Is a keytab file encrypted?

daemon@ATHENA.MIT.EDU (pratyush parimal)
Tue Jul 18 12:48:41 2017

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Date: Tue, 18 Jul 2017 12:48:28 -0400
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Hi guys,

Kind of a noob question, but here it goes.
When I export a principal's key to a keytab file using the following
command:

ktadd -k keytabfile service/host@REALM

(1) Does the keytabfile contain the key in encrypted form or as plaintext?
(2) Is it possible to export the key in encrypted form? If so, then how
does the service application open the encrypted keytab?

Thanks,
Pratyush
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