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Utilizing Kerberos , KINK peers must only mutually authenticate with the appropriate Authentication Server ( AS ) , with a Key Distribution Center ( KDC ) in turn controlling distribution of keying material for encryption and therefore controlling the IPSec security policy .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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