1 下载安装文件夹加密超级大师。
2 在需要加密的文件夹上单击右键选择加密。
3 输入你想设置的密码，点击确定就ok了。
一：最简单的加密解密大家对于JAVASCRIPT函数escape()和unescape()想必是比较了解啦（很多网页加密在用它们），分别是编码和解码字符串，比如例子代码用escape()函数加密后变为如下格式：
alert%28%22%u9ED1%u5BA2%u9632%u7EBF%22%29%3B
如何？还看的懂吗？当然其中的ASCII字符"alert"并没有被加密，如果愿意我们可以写点JAVASCRIPT代码重新把它加密如下：
%61%6C%65%72%74%28%22%u9ED1%u5BA2%u9632%u7EBF%22%29%3B
呵呵！如何？这次是完全都加密了！
当然，这样加密后的代码是不能直接运行的，幸好还有eval(codeString)可用，这个函数的作用就是检查JavaScript代码并执行，必选项 codeString 参数是包含有效 JavaScript 代码的字符串值，加上上面的解码unescape()，加密后的结果如下：
<SCRIPT LANGUAGE="JavaScript">
var code=unescape("%61%6C%65%72%74%28%22%u9ED1%u5BA2%u9632%u7EBF%22%29%3B")
eval(code)
</SCRIPT>
是不是很简单？不要高兴，解密也就同样的简单，解密代码都摆给别人啦（unescape()）！呵呵
二：转义字符"\"的妙用
大家可能对转义字符"\"不太熟悉，但对于JavaScript提供了一些特殊字符如：\n （换行）、 \r （回车）、\' （单引号 ）等应该是有所了解的吧？其实"\"后面还可以跟八进制或十六进制的数字，如字符"a"则可以表示为："\141"或"\x61"（注意是小写字符"x"），至于双字节字符如汉字"黑"则仅能用十六进制表示为"\u9ED1"（注意是小写字符"u"），其中字符"u"表示是双字节字符，根据这个原理例子代码则可以表示为：
八进制转义字符串如下:
<SCRIPT LANGUAGE="JavaScript">
eval("\141\154\145\162\164\50\42\u9ED1\u5BA2\u9632\u7EBF\42\51\73")
</SCRIPT>
十六进制转义字符串如下:
<SCRIPT LANGUAGE="JavaScript">
eval("\x61\x6C\x65\x72\x74\x28\x22\u9ED1\u5BA2\u9632\u7EBF\x22\x29\x3B")
</SCRIPT>
这次没有了解码函数，因为JavaScript执行时会自行转换，同样解码也是很简单如下：
<SCRIPT LANGUAGE="JavaScript">
alert("\x61\x6C\x65\x72\x74\x28\x22\u9ED1\u5BA2\u9632\u7EBF\x22\x29\x3B")
</SCRIPT>
就会弹出对话框告诉你解密后的结果！
使用下面的函数，例如varpwd=hex_md5("hello world")对"hello world"进行md5加密。var hexcase = 0function hex_md5(a) {
if (a == "") return a
return rstr2hex(rstr_md5(str2rstr_utf8(a)))
}
function hex_hmac_md5(a, b) {
return rstr2hex(rstr_hmac_md5(str2rstr_utf8(a), str2rstr_utf8(b)))
}
function md5_vm_test() {
return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72"
}
function rstr_md5(a) {
return binl2rstr(binl_md5(rstr2binl(a), a.length * 8))
}
function rstr_hmac_md5(c, f) {
var e = rstr2binl(c)
if (e.length >16) {
e = binl_md5(e, c.length * 8)
}
var a = Array(16),
d = Array(16)
for (var b = 0b <16b++) {
a[b] = e[b] ^ 909522486
d[b] = e[b] ^ 1549556828
}
var g = binl_md5(a.concat(rstr2binl(f)), 512 + f.length * 8)
return binl2rstr(binl_md5(d.concat(g), 512 + 128))
}
function rstr2hex(c) {
try {
hexcase
} catch(g) {
hexcase = 0
}
var f = hexcase ? "0123456789ABCDEF": "0123456789abcdef"
var b = ""
var a
for (var d = 0d <c.lengthd++) {
a = c.charCodeAt(d)
b += f.charAt((a >>>4) &15) + f.charAt(a &15)
}
return b
}
function str2rstr_utf8(c) {
var b = ""
var d = -1
var a, e
while (++d <c.length) {
a = c.charCodeAt(d)
e = d + 1 <c.length ? c.charCodeAt(d + 1) : 0
if (55296 <= a &&a <= 56319 &&56320 <= e &&e <= 57343) {
a = 65536 + ((a &1023) <<10) + (e &1023)
d++
}
if (a <= 127) {
b += String.fromCharCode(a)
} else {
if (a <= 2047) {
b += String.fromCharCode(192 | ((a >>>6) &31), 128 | (a &63))
} else {
if (a <= 65535) {
b += String.fromCharCode(224 | ((a >>>12) &15), 128 | ((a >>>6) &63), 128 | (a &63))
} else {
if (a <= 2097151) {
b += String.fromCharCode(240 | ((a >>>18) &7), 128 | ((a >>>12) &63), 128 | ((a >>>6) &63), 128 | (a &63))
}
}
}
}
}
return b
}
function rstr2binl(b) {
var a = Array(b.length >>2)
for (var c = 0c <a.lengthc++) {
a[c] = 0
}
for (var c = 0c <b.length * 8c += 8) {
a[c >>5] |= (b.charCodeAt(c / 8) &255) <<(c % 32)
}
return a
}
function binl2rstr(b) {
var a = ""
for (var c = 0c <b.length * 32c += 8) {
a += String.fromCharCode((b[c >>5] >>>(c % 32)) &255)
}
return a
}
function binl_md5(p, k) {
p[k >>5] |= 128 <<((k) % 32)
p[(((k + 64) >>>9) <<4) + 14] = k
var o = 1732584193
var n = -271733879
var m = -1732584194
var l = 271733878
for (var g = 0g <p.lengthg += 16) {
var j = o
var h = n
var f = m
var e = l
o = md5_ff(o, n, m, l, p[g + 0], 7, -680876936)
l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586)
m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819)
n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330)
o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897)
l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426)
m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341)
n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983)
o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416)
l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417)
m = md5_ff(m, l, o, n, p[g + 10], 17, -42063)
n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162)
o = md5_ff(o, n, m, l, p[g + 12], 7, 1804603682)
l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101)
m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290)
n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329)
o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510)
l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632)
m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713)
n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302)
o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691)
l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083)
m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335)
n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848)
o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438)
l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690)
m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961)
n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501)
o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467)
l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784)
m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473)
n = md5_gg(n, m, l, o, p[g + 12], 20, -1926607734)
o = md5_hh(o, n, m, l, p[g + 5], 4, -378558)
l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463)
m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562)
n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556)
o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060)
l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353)
m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632)
n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640)
o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174)
l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222)
m = md5_hh(m, l, o, n, p[g + 3], 16, -722521979)
n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189)
o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487)
l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835)
m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520)
n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651)
o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844)
l = md5_ii(l, o, n, m, p[g + 7], 10, 1126891415)
m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905)
n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055)
o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571)
l = md5_ii(l, o, n, m, p[g + 3], 10, -1894986606)
m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523)
n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799)
o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359)
l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744)
m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380)
n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649)
o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070)
l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379)
m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259)
n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551)
o = safe_add(o, j)
n = safe_add(n, h)
m = safe_add(m, f)
l = safe_add(l, e)
}
return Array(o, n, m, l)
}
function md5_cmn(h, e, d, c, g, f) {
return safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)
}
function md5_ff(g, f, k, j, e, i, h) {
return md5_cmn((f &k) | ((~f) &j), g, f, e, i, h)
}
function md5_gg(g, f, k, j, e, i, h) {
return md5_cmn((f &j) | (k &(~j)), g, f, e, i, h)
}
function md5_hh(g, f, k, j, e, i, h) {
return md5_cmn(f ^ k ^ j, g, f, e, i, h)
}
function md5_ii(g, f, k, j, e, i, h) {
return md5_cmn(k ^ (f | (~j)), g, f, e, i, h)
}
function safe_add(a, d) {
var c = (a &65535) + (d &65535)
var b = (a >>16) + (d >>16) + (c >>16)
return (b <<16) | (c &65535)
}
function bit_rol(a, b) {
return (a <<b) | (a >>>(32 - b))
}
