Matt Pavlovich writes:

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Does your LDAP server have the user's plain test passwords in it?  Can
courier read those fields?  The CRAM-MD5 and CRAM-SHA1 methods need
plain test passwords in the password database.
How does CRAM-SHA1 differ from a standard SHA1 hash?
It is, basically SHA1(secret' + SHA1(challenge')), where secret' is derived from a known secret key (the password), and challenge' is derived from a randomly-generated string. The server generates a random string and transmits it to the client. The client computes the entire formula, starting with the cleartext password, and returns the final hash to the server. The server computes the same formula, and accepts the client if the client supplies the same hash as computed by the server. The server performs an identical calculation; therefore the server must also know the cleartext password.




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