密码学实验之凯撒密码和维吉尼亚密码的加解密new

《密码学实验之凯撒密码和维吉尼亚密码的加解密new》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、1.凯撒密码的加解密源代码：#include#include#includeintmain(){chars[100],c;inti,p,d,e;printf("请选择:A.加密B.解密Q.退出");scanf("%c",&c);if(c=='a'

2、

3、c=='A'){printf("输入明文:");scanf("%s",&s);p=strlen(s);printf("请设置偏移量:");scanf("%d",&d);for(i=0;i<

4、p;i++){if(s[i]>='a'&&s[i]<='z')s[i]=(s[i]-'a'+d)%26+'a';elseif(s[i]>='A'&&s[i]<='Z')s[i]=(s[i]-'A'+d)%26+'A';elses[i]=s[i]+d;}printf("%s",s);printf("");}if(c=='b'

5、

6、c=='B'){printf("请输入密文:");scanf("%s",&s);p=strlen(s);printf("请输入加密的偏移变量:");scanf(

7、"%d",&d);for(i=0;i='a'&&s[i]<='z'){e=s[i]-'a'-d;if(e<=0)s[i]=(e+26)%26+'a';elses[i]=e%26+'a';}elseif(s[i]>='A'&&s[i]<='Z'){e=s[i]-'A'-d;if(e<0)s[i]=(e+26)%26+'A';elses[i]=e%26+'A';}elses[i]=s[i]-d;}printf("%s",s);printf("");}if(c=

8、='q'

9、

10、c=='Q')return0;return0;}运行结果是：2.维吉尼亚密码的加解密源代码：#include"stdafx.h"#includeusingnamespacestd;#defineMINCHAR32#defineCHARSUM94chartable[CHARSUM][CHARSUM];boolInit();boolEncode(char*key,char*source,char*dest);boolDncode(char*key,char*sourc

11、e,char*dest);intmain(){if(!Init()){cout<<"初始化错误！"<>operation;}while(operation!=-1&&operation!=1&&operation!=2);if(operation==-1)ret

12、urn0;elseif(operation==1)//加密{cout<<"请输入密钥：";cin>>key;cout<<"请输入待加密字符串：";cin>>str1;Encode(key,str1,str2);cout<<"加密后的字符串："<>key;cout<<"请输入待解密字符串：";cin>>str1;Dncode(key,str1,str2);cout<<"解密后的字符串：

13、"<

14、*tempSource=source;char*tempKey=key;char*tempDest=dest;do{*tempDest=table[(*tempKey)-MINCHAR][(*tempSource)-MINCHAR];tempDest++;if(!(*(++tempKey)))tempKey=key;}while(*tempSource++);dest[strlen(source)]=0;returntrue;}//解密//key：密钥//source：待解密的字符串//dest