Through the read-write analysis of BMP data bit, and combining the document transmission characteristic and MD5 encryption algorithm, electronic document stamping is realized by user.

通过对BMP图像数据位的读写分析，结合公文流转的特点以及MD5加密算法，实现用户对电子公文的加盖公章操作。

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In this paper, we first analysis the characteristic of multimedia message. Then propose a method that extends the local function of user agent to build multimedia electronic mailing system.

本文首先分析了多媒体邮件的特点，然后描述了一种在现有的成熟邮件系统基础上通过扩充用户代理的本地功能来处理多媒体邮件的方法。

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