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Date: Sun, 18 Nov 2012 12:36:48 +0100
From: buawig <buawig@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: cracking passwords with a kerberos traffic dump
 / aes256-cts-hmac-sha1-96 (18) [MS]

>> Does the RFC specify how to encode the password? Is the known plaintext string included in the RFC?
> 
> RFC doesn't mention UTF anywhere it seems . Test vectors are included
> in https://tools.ietf.org/rfc/rfc3962.txt

https://tools.ietf.org/html/rfc3961 (that defines how to define a
Kerberos Encryption Algorithm Profile) has something about pass phrase
encoding:

   string-to-key (UTF-8 string, UTF-8 string, opaque)->(protocol-key)
      This function generates a key from two UTF-8 strings and an opaque
      octet string.  One of the strings is usually the principal's pass
      phrase, but generally it is merely a secret string.  The other
      string is a "salt" string intended to produce different keys from
      the same password for different users or realms.  Although the
      strings provided will use UTF-8 encoding, no specific version of
      Unicode should be assumed; all valid UTF-8 strings should be
      allowed.  Strings provided in other encodings MUST first be
      converted to UTF-8 before applying this function.

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