Fix session key security issues #1
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Since the password was set to None, the session hash was always identical and predictable for an attacker. A new random salt is added to replace the password which served this funciton before. Should the new session salt is set be default to a rendom value. Should the salt be set to None for some reason, the `get_session_auth_hash` method will raise a `ValueError`. The password field is now removed from the user model. It will raise a `FieldDoesNotExist` error, should the attribute be access further preventing similar security issues.
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Since the password was set to None, the session hash was always
identical and predictable for an attacker. A new random salt is
added to replace the password which served this funciton before.
Should the new session salt is set be default to a rendom value.
Should the salt be set to None for some reason, the
get_session_auth_hashmethod will raise aValueError.The password field is now removed from the user model. It will
raise a
FieldDoesNotExisterror, should the attribute beaccess further preventing similar security issues.