No one has responded to my questions. I am wondering if anyone can point me to 
where in postgresql source code I can further look into the issue and explore 
the possibility of this change?  Thanks.

Sent: Thursday, December 15, 2011 4:53 PM
To: pgsql-admin@postgresql.org
Subject: [ADMIN] User password encryption using a stronger hashing function?

By default, postgresql encrypts user passwords using the MD5 hashing function. 
They can be seen as "md5....." in the rolpassword column of the pg_authid 
table. Is there a mechanism that allows us to change this default behavior such 
that postgresql can encrypt the passwords stored in the pg_authid table using a 
stronger hashing function such as SHA1?

Postgresql conf file has a property "ssl_ciphers" in which you can specify a 
list of ciphers. But they are only used on ssl connections and have no impact 
on the ciphers used in user password encryption. Is this correct?

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