ISO/TR 9564-4:2004提供了开放网络中个人识别号PIN处理的指南，介绍了在发卡机构和收单机构无法直接控制管理的环境中，金融业PIN管理和金融卡交易处理的最佳实践安全措施，或者在交易之前，PIN输入设备与收单机构之间不存在任何关系。

ISO/TR 9564-4:2004 provides guidelines for personal identification number PIN handling in open networks, presenting finance industry best-practice security measures for PIN management and the handling of financial card originated transactions in environments where issuers and acquirers have no direct control over management, or where no relationship exists between the PIN entry device and the acquirer prior to the transaction.