先前在 Unix 機器上, 有一隻小程式 "crypt"
crypt
Encrypt a file using a key you specify. The key should not contain whitespace (space or tab).
Example:
crypt F(x)=12 < exam1 > green
Encrypts a file named exam1 using the key F(x)=12. Here the encrypted output file is named green.
crypt F(x)=12 < green > happy
This deciphers the above file and saves the output in the file happy. One must use the same key, but the output file need not have the old name (you may not know the original name anyway).
基本上就是把檔案加密用. 找了好久, 都沒看到.
謝謝大家.