This paper presents a partial encryption of gray images compressed by Set Partitioning in Hierarchical Trees (SPIHT).
图像部分加密方法只加密图像压缩编码的部分重要数据，是一种可行的实时加密方案。
Therefore partial encryption fore-office document requires us to solve, because the traditional way to encrypt is for the whole document.
而传统的加密方式是对整个文档进行加密，所以部分加密对电子公文来说是一个需要解决的问题。
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