对于系统中需要外在的物理媒介来保存的加密密钥，使用基于口令的加密技术对密钥加密，将密钥保存在计算机文件系统中。
Encrypted cryptographic key, which need to be saved in the extern media, was encrypted with Password-Based Encryption technology and was saved in the computer file system.
作者为了证明自己完成了这些工作，只能将手稿打包加密后保存在安全的媒介中，并公开相应的数字签名。
The author decides to unleash the digital digest of the manuscript, and store the encrypted manuscript in the secured media. Thus the author could prove he have already finished this manuscript.
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