使用一个密码并在数据泄漏时保护自己的其它账号

Python实现

#python
import hashlib #python自带的哈希函数库
import reprint("输入原密码")
source_pwd=input()print("输入网站(app)标识")
sign= input()input_str=source_pwd + signoutput_32 = hashlib.md5(input_str.encode("utf-8")).hexdigest()#取32位md5值的8-24位
output_16=output_32[8:24]#把第一个小写字母变大写
print(re.sub("([a-zA-Z])", lambda x: x.groups()[0].upper(), output_16, 1))

还可以用在线网站进行加密

https://www.sojson.com/encrypt_md5.html

运行结果

也就是说在基础密码为123456的情况下

我们CSDN的密码应该是 5C76af8af8d85310

而微信的密码话应该是 24E9537395d3b37c

其它的密码如QQ、学习通同理，我们在保存时只需要在文件或记事本里保存网站的标识即可，这样即使别人拿到也无法盗取密码，并且某一软件的密码被盗取也不会影响其它软件。

md5.cpp是外部的文件，需要添加并引用（引自百度百科）

#include
#include
using namespace std;
#define shift(x, n) (((x) << (n)) | ((x) >> (32-(n))))//右移的时候，高位一定要补零，而不是补充符号位
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))    
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
#define A 0x67452301
#define B 0xefcdab89
#define C 0x98badcfe
#define D 0x10325476
//strBaye的长度
unsigned int strlength;
//A,B,C,D的临时变量
unsigned int atemp;
unsigned int btemp;
unsigned int ctemp;
unsigned int dtemp;
//常量ti unsigned int(abs(sin(i+1))*(2pow32))
const unsigned int k[]={0xd76aa478,0xe8c7b756,0x242070db,0xc1bdceee,0xf57c0faf,0x4787c62a,0xa8304613,0xfd469501,0x698098d8,0x8b44f7af,0xffff5bb1,0x895cd7be,0x6b901122,0xfd987193,0xa679438e,0x49b40821,0xf61e2562,0xc040b340,0x265e5a51,0xe9b6c7aa,0xd62f105d,0x02441453,0xd8a1e681,0xe7d3fbc8,0x21e1cde6,0xc33707d6,0xf4d50d87,0x455a14ed,0xa9e3e905,0xfcefa3f8,0x676f02d9,0x8d2a4c8a,0xfffa3942,0x8771f681,0x6d9d6122,0xfde5380c,0xa4beea44,0x4bdecfa9,0xf6bb4b60,0xbebfbc70,0x289b7ec6,0xeaa127fa,0xd4ef3085,0x04881d05,0xd9d4d039,0xe6db99e5,0x1fa27cf8,0xc4ac5665,0xf4292244,0x432aff97,0xab9423a7,0xfc93a039,0x655b59c3,0x8f0ccc92,0xffeff47d,0x85845dd1,0x6fa87e4f,0xfe2ce6e0,0xa3014314,0x4e0811a1,0xf7537e82,0xbd3af235,0x2ad7d2bb,0xeb86d391};
//向左位移数
const unsigned int s[]={7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21};
const char str16[]="0123456789abcdef";
void mainLoop(unsigned int M[])
{unsigned int f,g;unsigned int a=atemp;unsigned int b=btemp;unsigned int c=ctemp;unsigned int d=dtemp;for (unsigned int i = 0; i < 64; i++){if(i<16){f=F(b,c,d);g=i;}else if (i<32){f=G(b,c,d);g=(5*i+1)%16;}else if(i<48){f=H(b,c,d);g=(3*i+5)%16;}else{f=I(b,c,d);g=(7*i)%16;}unsigned int tmp=d;d=c;c=b;b=b+shift((a+f+k[i]+M[g]),s[i]);a=tmp;}atemp=a+atemp;btemp=b+btemp;ctemp=c+ctemp;dtemp=d+dtemp;
}
/*
*填充函数
*处理后应满足bits≡448(mod512),字节就是bytes≡56（mode64)
*填充方式为先加一个1,其它位补零
*最后加上64位的原来长度
*/
unsigned int* add(string str)
{unsigned int num=((str.length()+8)/64)+1;//以512位,64个字节为一组unsigned int *strByte=new unsigned int[num*16];    //64/4=16,所以有16个整数strlength=num*16;for (unsigned int i = 0; i < num*16; i++)strByte[i]=0;for (unsigned int i=0; i strByte[i>>2]|=(str[i])<<((i%4)*8);//一个整数存储四个字节，i>>2表示i/4 一个unsigned int对应4个字节，保存4个字符信息}strByte[str.length()>>2]|=0x80<<(((str.length()%4))*8);//尾部添加1 一个unsigned int保存4个字符信息,所以用128左移/**添加原长度，长度指位的长度，所以要乘8，然后是小端序，所以放在倒数第二个,这里长度只用了32位*/strByte[num*16-2]=str.length()*8;return strByte;
}
string changeHex(int a)
{int b;string str1;string str="";for(int i=0;i<4;i++){str1="";b=((a>>i*8)%(1<<8))&0xff;   //逆序处理每个字节for (int j = 0; j < 2; j++){str1.insert(0,1,str16[b%16]);b=b/16;}str+=str1;}return str;
}
string getMD5(string source)
{atemp=A;    //初始化btemp=B;ctemp=C;dtemp=D;unsigned int *strByte=add(source);for(unsigned int i=0;iunsigned int num[16];for(unsigned int j=0;j<16;j++)num[j]=strByte[i*16+j];mainLoop(num);}return changeHex(atemp).append(changeHex(btemp)).append(changeHex(ctemp)).append(changeHex(dtemp));
}