Re: md5 hash question (2)

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От Bruce Momjian
Тема Re: md5 hash question (2)
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Msg-id 200212101905.gBAJ5hR14876@candle.pha.pa.us
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Ответ на md5 hash question (2)  (Çağıl Şeker <cagils@biznet.com.tr>)
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�a��l �eker wrote:
>
> sorry, but I have another q about that md5 hashing. When I use
> a sniffer on the wire I see md5 hashes of user - probably the
> password hash. But when I compare the password hash with the
> hash on the wire I see they are different. In what format is
> the md5 hash on the wire encoded? I've tried double md5'ing but
> didn't get the right hash.

Ah, so your are snooping.  The trick is that a random number is sent to
the client on connection.  The client double-MD5 encrypts the
user-supplied password --- once using the username as salt, and secondly
using the random number sent by the server.  That way, you can't replay
the sniffed password later to connect to the server.

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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