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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _init_security(self):
 """ Initialize a secure connection to the server. """

        if not self._starttls():
            raise SecurityError("Could not start TLS connection")
        # _ssh_handshake() will throw an exception upon failure
        self._ssl_handshake()
        if not self._auth():
            raise SecurityError("Could not authorize connection")