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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- string pt,encrypt;
- cout<<"Enter plain text: ";
- cin>>pt;
- if(pt.size()%2!=0)
- pt+='X';
- int n;
- cout<<"Enter the order of key: ";
- cin>>n;
- ///taking key matrix
- int arr[n][n];
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<n;j++)
- {
- cin>>arr[i][j];
- }
- }
- int ind=0;
- for(int l=0;l<pt.size();l+=2){
- int arr1[n][1];
- for(int i=0;i<n;i++)
- {
- arr1[i][0]=pt[ind]-'A';
- ind++;
- }
- ///Matrix Multiplication
- int ans[n][1];
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<1;j++)
- {
- ans[i][j]=0;
- }
- }
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<1;j++)
- {
- for(int k=0;k<n;k++){
- ans[i][j]=(ans[i][j]+arr[i][k]*arr1[k][j])%26;
- //cout<<arr[i][k]<<" "<<arr1[k][j]<<endl;
- }
- }
- }
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<1;j++)
- {
- encrypt+='A'+ans[i][j];
- }
- }
- }
- cout<<"Encrypt Message: "<<encrypt<<endl;
- ///inverse matrix;
- int mulinv=0;
- int det=(arr[0][0]*arr[1][1])-(arr[0][1]*arr[1][0]);
- for(int i=1;;i++)
- {
- if((det*i)%26==1){
- mulinv=i;
- cout<<"multiplication inverse: "<<mulinv<<endl;
- break;
- }
- }
- int arr2[n][n];
- int temp=arr[0][0];
- arr[0][0]=arr[1][1];
- arr[1][1]=temp;
- arr[0][1]=(-1*arr[0][1]);
- arr[1][0]=(-1*arr[1][0]);
- cout<<"Adj: "<<endl;
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<n;j++)
- {
- cout<<arr[i][j]<<" ";
- }
- cout<<endl;
- }
- cout<<endl<<endl;
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<n;j++)
- {
- arr2[i][j]=((arr[i][j]*mulinv)%26);
- }
- }
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<n;j++)
- {
- if(arr2[i][j]<0)
- arr2[i][j]+=26;
- }
- }
- string decrypt;
- int ind1=0;
- for(int l=0;l<encrypt.size();l+=2){
- int arr3[n][1];
- int arr1[n][1];
- for(int i=0;i<n;i++)
- {
- arr3[i][0]=encrypt[ind1]-'A';
- ind1++;
- }
- int ans1[n][1];
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<1;j++)
- {
- ans1[i][j]=0;
- }
- }
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<n;j++)
- {
- cout<<arr2[i][j]<<" ";
- }
- cout<<endl;
- }
- cout<<endl;
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<1;j++)
- {
- cout<<arr3[i][j];
- }
- cout<<endl;
- }
- cout<<endl;
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<1;j++)
- {
- for(int k=0;k<n;k++){
- ans1[i][j]=(ans1[i][j]+arr2[i][k]*arr3[k][j])%26;
- //cout<<ans1[i][j]<<" ";
- //cout<<arr[i][k]<<" "<<arr1[k][j]<<endl;
- }
- }
- }
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<1;j++)
- {
- decrypt+=ans1[i][j]+'A';
- }
- }
- }
- cout<<"Decrypt Message: "<<decrypt<<endl;
- return 0;
- }
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