X9 TR-31-2018描述了一种符合ANS X9要求的方法。24零售金融服务对称密钥管理第1部分:共享对称密钥交换密钥的两台设备之间密钥和其他敏感数据的安全交换。该方法也可用于在对称密钥下存储密钥。本文件不是安全标准，也不是为了建立安全要求。相反，它旨在提供一种可互操作的方法来实现安全需求和策略。

X9 TR-31-2018 describes a method consistent with the requirements of ANS X9.24 Retail Financial Services Symmetric Key Management Part 1 for the secure exchange of keys and other sensitive data between two devices that share a symmetric key exchange key. This method may also be used for the storage of keys under a symmetric key.This document is not a security standard and is not intended to establish security requirements. It is intended instead to provide an interoperable method of implementing security requirements and policies.