Description: reproduced for file encryption technologies lot, which will be divided into different levels, to suit the needs of different occasions. Here is the most simple file encryption technology, which adopts a case-by-byte file with the password or different ways to document encryption, decryption, only re-running again can be encrypted . Below is a sample program that can be an arbitrary document to be encrypted, password request user input limit within eight (of course you can change). procedures have a good fault-tolerant design, that is what we should learn.
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