通过引入虚拟用户和二级密钥，提高机制的抗同谋能力。
Through introducing virtual users and secondary keys, the mechanism improve the ability of resistance to conspiracy.
在数字防伪系统中，采用“二级关联密钥管理技术”来实现存储分组算法的密钥管理。
In this system, using two-level association key management technology realizes key management of storage grouping algorithm.
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