[Twisted-Python] Limiting cipher options for SSH/SFTP

[Ray Cote]

I need to limit the ciphers offered for an ssh/sftp connection. 

class ESFTPServerForUnixConchUser(SFTPServerForUnixConchUser):
    """Main local proxy class for file transfer access.

    Many methods are overriden to support file encryption and
    encrypted file name mappings.
    """

    def __init__(self, avatar):
        """Initialize class with avatar representing user information"""
        SFTPServerForUnixConchUser.__init__(self, avatar)

I'm unclear as to how to restrict which ciphers to use at this level.
--Ray

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Ray Cote, President Appropriate Solutions, Inc. 
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