Amali ishi-3 fan : Kriptografiya guruh- 072-19 omonov kamoliddin variant-11 toshkent 2022 Sezor shifrlash usuli Shifrlash

O'ZBЕKISTON RESPUBLIKASI AXBOROT TEXNOLOGIYALARI VA KOMMUNIKATSIYALARINI RIVOJLANTIRISH VAZIRLIGI MUHAMMAD AL-XORAZMIY NOMIDAGI TOSHKЕNT AXBOROT TЕXNOLOGIYALARI UNIVЕRSITЕTI

Amali ishi-3

FAN : Kriptografiya

GURUH- 072-19
OMONOV KAMOLIDDIN
Variant-11

TOSHKENT 2022

Sezor shifrlash usuli
Shifrlash:
#include
#include
using namespace std;
int main(){
int i;
string s,t;
int key;
cout<<"kalitni kiriting\n";
cin>>key;
cout<<"ochiq matnni kiriting\n";
cin>>s;
for(i=0;it+=(s[i]-'A'+key)%26+'A';
}
cout<<"\n\nshifrmatn "<return 0;
}


Deshifrlash:
#include
#include
using namespace std;
int main(){
int i;
string s,t;
int key;
cout<<"kalitni kiriting:\n";
cin>>key;
cout<<"shifrmatnni kiriting:\n";
cin>>s;
for(i=0;it+=(s[i]-'A'-key)%26+'A';
}
cout<<"\n\nOchiqmatn:"<return 0;
}

Vernam Shifrlash usuli
Shifr code:
#include
using namespace std;
int main(){
int i,j;
string m;
cout<<"Ochiq matnni kiriting"<<'\n';
cin>>m;
string key;
cout<<"Kalitni kiriting"<<'\n';
cin>>key;
int mod = key.size();
j=0;
for(i=key.size();i
key+=key[j%mod];
j++;
}
string shifrmatn="";
for(i=0;i
shifrmatn += (key[i]-'A'+m[i]-'A')%26+'A';
}
cout<<"Shifrmatn: "<
return 0
}


Deshifr code:
#include
using namespace std;
int main(){
int i,j;
string m;
cout<<"Shifrmatnni kiriting"<<'\n';
cin>>m;
string key;
cout<<"Kalitni kiriting"<<'\n';
cin>>key;
int mod = key.size();
j=0;
for(i=key.size();i
key+=key[j%mod];
j++;
}
string ochiqmatn="";
for(i=0;i
ochiqmatn += (m[i]-key[i]+26)%26+'A';
}
cout<<"Ochiqmatn: "<
return 0;
}


Vejiner Shifrlash usuli
Dastur kodi: DESHIFRLASH
#include
#include
#include
using namespace std;
int main(){
int i,j,k,n;
vector > a(26,vector(26));
k=0;
n=26;
for(i=0;i
k=i;
for(j=0;j
a[i][j]='A'+k;
k++;
if(k==26)
k=0;
}
}
cout<<"ochiqmatnni kiriting\n";
string s;
cin>>s;
cout<<"kalitni kiriting\n";
string key;
cin>>key;
k=0;
int mod = key.size();
for(i=key.size();i
key+=key[k%mod];
k++;
}
string ochiqmatn;
for(i=0;i
for(j=0;j
{
if(a[j][key[i]-'A']==s[i])
{
ochiqmatn+='A'+j;
break;
}
}
}
cout<<"shifrmatn: "<
return 0;
}