该配置的缺点在于，由于服务请求被提交并由每个服务器本地处理，所以不能确定离散的消息顺序。
The disadvantage of this configuration is that, as service requests are presented and processed locally by each server, the sequencing of discrete messages cannot be assured.
然后用例被断成一组离散的操作，且数据需求(消息)被指定。
The use cases are then broken down into a set of discrete operations and the data requirements (messages) are specified.
本文设计了两种具有消息恢复的数字签名方案，其安全性都是基于因子分解问题和离散对数问题的。
In this paper, two schemes for digital signature with message recovery are presented. The security of these schemes is based on factorization and discrete logarithms.
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