Abstract: In order to ensure the security of file distribution and avoid the network environment of low bandwidth and high delay during file distribution, functions such as version verification, file backup and recovery, remote maintenance are designed to ensure the security and reliability of file transmission. Incremental transmission algorithm adapted to different networks is used to solve the problem of slow file distribution efficiency in low bandwidth environment. Experiment shows that the transmission efficiency of the file distribution system in the low bandwidth network environment is 52% higher than that of the full transmission system.

Key words: incremental transmission, file distribution security, low bandwidth

摘要： 文件分发时经常面临低带宽、高延迟的网络环境，为保证文件分发安全，设计版本校验、文件备份与恢复、远程维护等功能来保证文件传输的安全性与可靠性，并用适应不同网络的增量式传输算法来解决低带宽环境下文件分发效率慢的问题。实验证明，在低带宽的网络环境下文件分发系统较全量式传输系统提高了52%的传输效率。

关键词: 增量式传输, 文件分发安全, 低带宽