公开(公告)号：US09215073B2

公开(公告)日：2015-12-15

申请号：US14243635

申请日：2014-04-02

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiangguo Cheng ,  Jia Yu ,  Qinqin Yang

IPC: H04L9/32 ,  H04L9/08

CPC classification number: H04L9/3242 ,  H04L9/088

Abstract: Embodiments of the present invention provide a key insulation method and device. The key insulation method includes: randomly selecting a first parameter s from Z*q, acquiring a helper initial key from a helper, and generating an initial user private key according to the first parameter s, a preset first cryptographic hash function H1, and the helper initial key; and acquiring a helper updated key for a time segment i from the helper, and updating a user private key for a time segment j according to the helper updated key for the time segment i to obtain a user private key for the time segment i. According to the key insulation method and device provided by the embodiments, in a process of generating an initial key and a process of updating a key, lifecycle is not involved, which improves flexibility of a key system.

Abstract translation: 本发明的实施例提供了一种密钥绝缘方法和装置。 密钥绝缘方法包括：从Z * q随机选择第一参数，从帮助者获取辅助初始密钥，并根据第一参数s生成初始用户私钥，预设的第一密码散列函数H1，以及 帮手初始密钥; 以及从帮助者获取时段i的辅助更新密钥，并且根据时间段i的帮助更新密钥更新时段j的用户专用密钥，以获得时间段i的用户专用密钥。 根据实施例提供的密钥绝缘方法和装置，在生成初始密钥的过程和更新密钥的过程中，不涉及生命周期，这提高了密钥系统的灵活性。