def METHOD_NAME(self, pdu: SecurityExchangePDU):
    """
    Set the security settings' client random from the security exchange.
    :param pdu: the security exchange
    """
    clientRandom = RSA(self.state.rc4RSAKey).decrypt(pdu.clientRandom[:: -1])[:: -1]
    self.state.securitySettings.setClientRandom(clientRandom)
    self.server.sendSecurityExchange(self.state.securitySettings.encryptClientRandom())