when Mode::CLIENT
        encryption_algorithm_s_to_c_name = @local_encryption_algorithms_server_to_client.find{ |a| @remote_encryption_algorithms_server_to_client.include? a } or raise
        encryption_algorithm_c_to_s_name = @local_encryption_algorithms_client_to_server.find{ |a| @remote_encryption_algorithms_client_to_server.include? a } or raise
        incoming_encryption_algorithm_name = encryption_algorithm_s_to_c_name
        outgoing_encryption_algorithm_name = encryption_algorithm_c_to_s_name