主题：base64位加解密法

执行加解密的base64代码包
http://blogimg.chinaunix.net/blog/upfile2/090630011922.gz

解压放到任意位置
cmd运行
打开所在位置，
运行代码
base64 -e 1.txt 2.txt
下面第一条的意思是代码运行规则
OPTION解释各个代码位置的含义
如果是-d就是解密，-e就是加密
一定以输入输出文件运行，不能直接加解密代码，
像上面那条，可以将要加密的代码输入到1.txt，加密后的代码就会在2.txt里了
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base64 [ -d / -e ] [ options ] [ infile ] [ outfile ]
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OPTIONS

--copyright

Print copyright information.

-d, --decode

Decodes the input, previously created by base64, to recover the original input file.

-e, --encode

Encodes the input into an output text file containing its base64 encoding.

-n, --noerrcheck

Suppress error checking when decoding. By default, upon encountering a non white space character which does not belong to the base64 set, or discovering the input file is incorrectly padded to a multiple of four characters, base64 issues an error message and terminates processing with exit status 1. The -n option suppresses even this rudimentary error checking; invalid characters are silently ignored and the output truncated to the last three valid octets if the input is incorrectly padded.

-u, --help

Print how to call information and a summary of options.

--version

Print program version information.

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