运用python编写凯撒密码并实现_凯撒密码实现英文短句的加解密

1. 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

#include

#define maxlen 100

#define K 7

char *KaisaEncode(char *str)//加密

{

char *d0;

d0=str;

for(;*str!='';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!='';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#includechar encrypt(char ch,int n)/*加密函数，把字符向右循环移位n*/ { while(ch>='A'&&ch<='Z') { return ('A'+(ch-'A'+n)%26); } while(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.Quitn"); 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<='Z')||(c>='a'&&c<='z')) { c=c+N; if (!((c>='A'&&c<='Z')||(c>='a'&&c<='z')))c=c-26; if(c>='a'&&c<='z')c=c-32; } fprintf(fp_file2,"%c",c); } fclose(fp_file2); fclose(fp_jiami); } void jiemi(char en_name[256]) { FILE *fp_jiemi,*fp_file3; char c; fp_jiemi=fopen(en_name,"rb"); fp_file3=fopen("file3.txt","wb"); while(EOF!=(fscanf(fp_jiemi,"%c",&c))) { if((c>='A'&&c<='Z')||(c>='a'&&c<='z')) { c=c-N; if (!((c>='A'&&c<='Z')||(c>='a'&&c<='z')))c=c+26; if(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！！nn"); break;} case 2:{jiemi(name);printf("t解密成功！！nn"); 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!