用jQuery.md5.js加密密码后后台怎么解密？
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MD5不是加密算法，它是Hash算法，所以它不可逆，也没法还原成原文。
你可以用base64、异或或者aes des等加密算法去实现。
1、base64加密
在页面中引入base64.js文件，调用方法为：
?
123456789101112131415161718<!DOCTYPE html><html><head><meta charset="utf-8"><title>base64加密</title><script type="text/javascript" src="base64.js"></script><script type="text/javascript"> var b = new Base64(); var str = b.encode("admin:admin"); alert("base64 encode:" + str);//解密 str = b.decode(str); alert("base64 decode:" + str);</script></head><body></body></html>2、md5加密
在页面中引用md5.js文件，调用方法为
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1234567891011121314<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>md5加密</title><script type="text/ecmascript" src="md5.js"></script><script type="text/javascript"> var hash = hex_md5("123dafd"); alert(hash)</script></head><body></body></html>3、sha1加密
据说这是最安全的加密
页面中引入sha1.js，调用方法为
?
1234567891011121314<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>sha1加密</title><script type="text/ecmascript" src="sha1.js"></script><script type="text/javascript"> var sha = hex_sha1('mima123465') alert(sha)</script></head><body></body></html>一下为js们的源代码
base64.js：
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106/**** Base64 encode / decode** @author haitao.tu* @date 2010-04-26* @email tuhaitao@foxmail.com**/function Base64() // private property _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; // public method for encoding this.encode = function (input) var output = ""; var chr1, chr2, chr3, enc1, enc2, enc3, enc4; var i = 0; input = _utf8_encode(input); while (i < input.length) chr1 = input.charCodeAt(i++); chr2 = input.charCodeAt(i++); chr3 = input.charCodeAt(i++); enc1 = chr1 >> 2; enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); enc4 = chr3 & 63; if (isNaN(chr2)) enc3 = enc4 = 64; else if (isNaN(chr3)) enc4 = 64; output = output + _keyStr.charAt(enc1) + _keyStr.charAt(enc2) + _keyStr.charAt(enc3) + _keyStr.charAt(enc4); return output; // public method for decoding this.decode = function (input) var output = ""; var chr1, chr2, chr3; var enc1, enc2, enc3, enc4; var i = 0; input = input.replace(/[^A-Za-z0-9\\+\\/\\=]/g, ""); while (i < input.length) enc1 = _keyStr.indexOf(input.charAt(i++)); enc2 = _keyStr.indexOf(input.charAt(i++)); enc3 = _keyStr.indexOf(input.charAt(i++)); enc4 = _keyStr.indexOf(input.charAt(i++)); chr1 = (enc1 << 2) | (enc2 >> 4); chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); chr3 = ((enc3 & 3) << 6) | enc4; output = output + String.fromCharCode(chr1); if (enc3 != 64) output = output + String.fromCharCode(chr2); if (enc4 != 64) output = output + String.fromCharCode(chr3); output = _utf8_decode(output); return output; // private method for UTF-8 encoding _utf8_encode = function (string) string = string.replace(/\\r\\n/g,"\\n"); var utftext = ""; for (var n = 0; n < string.length; n++) var c = string.charCodeAt(n); if (c < 128) utftext += String.fromCharCode(c); else if((c > 127) && (c < 2048)) utftext += String.fromCharCode((c >> 6) | 192); utftext += String.fromCharCode((c & 63) | 128); else utftext += String.fromCharCode((c >> 12) | 224); utftext += String.fromCharCode(((c >> 6) & 63) | 128); utftext += String.fromCharCode((c & 63) | 128); return utftext; // private method for UTF-8 decoding _utf8_decode = function (utftext) var string = ""; var i = 0; var c = c1 = c2 = 0; while ( i < utftext.length ) c = utftext.charCodeAt(i); if (c < 128) string += String.fromCharCode(c); i++; else if((c > 191) && (c < 224)) c2 = utftext.charCodeAt(i+1); string += String.fromCharCode(((c & 31) << 6) | (c2 & 63)); i += 2; else c2 = utftext.charCodeAt(i+1); c3 = utftext.charCodeAt(i+2); string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); i += 3; return string; 参考技术AMD5 加密是不可逆的吧 判断用户的时候也是把他密码加密后和数据库里的比较 一样的话就是正确的
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript" src="Scripts/jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="Scripts/jquery.md5.js"></script>
<script type="text/javascript">
alert($.md5("Hello"));
</script>
</head>
<body>
</body>
</html>
凯撒密码实现英文短句的加解密
参考技术A1. 将“We are students.”这个英文词句用k=4的凯萨密码翻译成密码
1. 恺撒密码，
作为一种最为古老的对称加密体制，他的基本思想是：
通过把字母移动一定的位数来实现加密和解密。
例如，如果密匙是把明文字母的位数向后移动三位，那么明文字母B就变成了密文的E，依次类推，X将变成A,Y变成B,Z变成C，由此可见，位数就是凯撒密码加密和解密的密钥。
如：ZHDUHVWXGHQWV（后移三位）
2. 凯撒密码，
是计算机C语言编程实现加密和解密。挺复杂的。你可以研究一下哦。
2. 将凯撒密码（K=7）的加密、解密过程用C语言编程实现
/*
声明：MSVC++6.0环境测试通过
*/
#include<stdio.h>
#include<ctype.h>
#define maxlen 100
#define K 7
char *KaisaEncode(char *str)//加密
char *d0;
d0=str;
for(;*str!=\'\\0\';str++)
if(isupper(*str))
*str=(*str-\'A\'+K)%26+\'A\';
else if(islower(*str))
*str=(*str-\'a\'+K)%26+\'a\';
else
continue;
return d0;
char *KaisaDecode(char *str)//解密
char *d0;
d0=str;
for(;*str!=\'\\0\';str++)
if(isupper(*str))
*str=(*str-\'A\'-K+26)%26+\'A\';
else if(islower(*str))
*str=(*str-\'a\'-K+26)%26+\'a\';
else
continue;
return d0;
int main(void)
char s[maxlen];
gets(s);
puts(KaisaEncode(s));
puts(KaisaDecode(s));
return 0;
3. 将凯撒密码X的加密、解密过程用C语言编程实现
(2)kaiser加密算法 具体程序：#include #include char encrypt(char ch,int n)/*加密函数，把字符向右循环移位n*/ while(ch>=\'A\'&&ch=\'a\'&&ch<=\'z\') return (\'a\'+(ch-\'a\'+n)%26); return ch; void menu（)/*菜单，1.加密，2.解密，3.暴力破解，密码只能是数字*/ clrscr(); printf("\\n========================================================="); printf("\\n1.Encrypt the file"); printf("\\n2.Decrypt the file"); printf("\\n3.Force decrypt file"); printf("\\n4.Quit\\n"); printf("=========================================================\\n"); printf("Please select a item:"); return; main() int i,n; char ch0,ch1; FILE *in,*out; char infile[20],outfile[20]; textbackground(BLACK); textcolor(LIGHTGREEN); clrscr(); sleep(3)；/*等待3秒*/ menu(); ch0=getch(); while(ch0!=\'4\') if(ch0==\'1\') clrscr(); printf("\\nPlease input the infile:"); scanf("%s",infile)；/*输入需要加密的文件名*/ if((in=fopen(infile,"r"))==NULL) printf("Can not open the infile!\\n"); printf("Press any key to exit!\\n"); getch(); exit(0); printf("Please input the key:"); scanf("%d",&n)；/*输入加密密码*/ printf("Please input the outfile:"); scanf("%s",outfile)；/*输入加密后文件的文件名*/ if((out=fopen(outfile,"w"))==NULL) printf("Can not open the outfile!\\n"); printf("Press any key to exit!\\n"); fclose(in); getch(); exit(0); while(!feof(in)）/*加密*/ fputc(encrypt(fgetc(in),n),out); printf("\\nEncrypt is over!\\n"); fclose(in); fclose(out); sleep(1); if(ch0==\'2\') clrscr(); printf("\\nPlease input the infile:"); scanf("%s",infile)；/*输入需要解密的文件名*/ if((in=fopen(infile,"r"))==NULL) printf("Can not open the infile!\\n"); printf("Press any key to exit!\\n"); getch(); exit(0); printf("Please input the key:"); scanf("%d",&n)；/*输入解密密码（可以为加密时候的密码）*/ n=26-n; printf("Please input the outfile:"); scanf("%s",outfile)；/*输入解密后文件的文件名*/ if((out=fopen(outfile,"w"))==NULL) printf("Can not open the outfile!\\n"); printf("Press any key to exit!\\n"); fclose(in); getch(); exit(0); while(!feof(in)) fputc(encrypt(fgetc(in),n),out); printf("\\nDecrypt is over!\\n"); fclose(in); fclose(out); sleep(1); if(ch0==\'3\') clrscr(); printf("\\nPlease input the infile:"); scanf("%s",infile)；/*输入需要解密的文件名*/ if((in=fopen(infile,"r"))==NULL) printf("Can not open the infile!\\n"); printf("Press any key to exit!\\n"); getch(); exit(0); printf("Please input the outfile:"); scanf("%s",outfile)；/*输入解密后文件的文件名*/ if((out=fopen(outfile,"w"))==NULL) printf("Can not open the outfile!\\n"); printf("Press any key to exit!\\n"); fclose(in); getch(); exit(0); for(i=1;i<=25;i++)/*暴力破解过程，在察看信息正确后，可以按\'Q\'或者\'q\'退出*/ rewind(in); rewind(out); clrscr(); printf("==========================================================\\n"); printf("The outfile is:\\n"); printf("==========================================================\\n"); while(!feof(in)) ch1=encrypt(fgetc(in),26-i); putch(ch1); fputc(ch1,out); printf("\\n========================================================\\n"); printf("The current key is: %d \\n",i)；/*显示当前破解所用密码*/ printf("Press \'Q\' to quit and other key to continue。
\\n"); printf("==========================================================\\n"); ch1=getch(); if(ch1==\'q\'||ch1==\'Q\')/*按\'Q\'或者\'q\'时退出*/ clrscr(); printf("\\nGood Bye!\\n"); fclose(in); fclose(out); sleep(3); exit(0); printf("\\nForce decrypt is over!\\n"); fclose(in); fclose(out); sleep(1); menu(); ch0=getch(); clrscr(); printf("\\nGood Bye!\\n"); sleep(3); 。
4. 怎样编写程序：实现恺撒密码加密单词"julus"
用下面程序：新建个txt，放进去任意单词，设置#define N 5中的值，实现字母移位，达到加密目的。
本程序提供解密功能/************************************************************************//* 版权所有：信息工程学院 王明 使用时请注明出处！！ *//* 算法：凯撒密码体制 e799bee5baa6e4b893e5b19e31333264643062 *//************************************************************************/#include #define N 5void jiami(char namea[256]) FILE *fp_jiami,*fp_file2; char c; fp_jiami=fopen(namea,"rb"); fp_file2=fopen("file2.txt","wb"); while(EOF!=(fscanf(fp_jiami,"%c",&c))) if((c>=\'A\'&&c=\'a\'&&c=\'A\'&&c=\'a\'&&c=\'a\'&&c=\'A\'&&c=\'a\'&&c=\'A\'&&c=\'a\'&&c=\'A\'&&c<=\'Z\')c=c+32; fprintf(fp_file3,"%c",c); fclose(fp_file3); fclose(fp_jiemi); int main() char name[256]; int n; printf（"输入你要操作的TXT文本："）； gets(name); printf("\\n请选择需要进行的操作：\\n"); printf(" 1：加密 2：解密 \\n"); printf（"输入你的选择："）； scanf("%d",&n); switch(n) case 1:jiami(name);printf("\\t加密成功！！\\n\\n"); break; case 2:jiemi(name);printf("\\t解密成功！！\\n\\n"); break; default:printf（"输入操作不存在！"）； return 0;。
5. 谁有PYTHON编写的凯撒密码的加密和解密代码
给你写了一个.
def convert(c, key, start = \'a\', n = 26):
a = ord(start)
offset = ((ord(c) - a + key)%n)
return chr(a + offset)
def caesarEncode(s, key):
o = ""
for c in s:
if c.islower():
o+= convert(c, key, \'a\')
elif c.isupper():
o+= convert(c, key, \'A\')
else:
o+= c
return o
def caesarDecode(s, key):
return caesarEncode(s, -key)
if __name__ == \'__main__\':
key = 3
s = \'Hello world!\'
e = caesarEncode(s, key)
d = caesarDecode(e, key)
print e
print d
运行结果：
Khoor zruog!
Hello world!
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