ISO/IEC 11770-4:2017定义了基于弱秘密的关键建立机制，即人类可以轻易记住的秘密，以及从相对较小的可能性中选择的秘密。它指定了专门设计的加密技术，用于基于从存储的密码派生的弱密钥建立一个或多个密钥，同时防止与弱密钥相关的离线暴力攻击。ISO/IEC 11770-4:2017不适用于密钥管理的以下方面: -弱秘密、强秘密和已建立密钥的生命周期管理； -存储、归档、删除、销毁等弱机密、强机密和已建立密钥的机制。

ISO/IEC 11770-4:2017 defines key establishment mechanisms based on weak secrets, i.e. secrets that can be readily memorized by a human, and hence, secrets that will be chosen from a relatively small set of possibilities. It specifies cryptographic techniques specifically designed to establish one or more secret keys based on a weak secret derived from a memorized password, while preventing offline brute-force attacks associated with the weak secret. ISO/IEC 11770-4:2017 is not applicable to the following aspects of key management: - life-cycle management of weak secrets, strong secrets, and established secret keys; - mechanisms to store, archive, delete, destroy, etc. weak secrets, strong secrets, and established secret keys.