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Title saurabh
Author saurabh
Author Email sid_isin [at] yahoo.com
Description his Program Will Encrypt And Decrypt Any File
Provides The Maximum Security
Category C++ » File Manipulation
Hits 11561
Code Select and Copy the Code
/* Written By : Saurabh Jain I Year B.sc (Hons) Computer Science College Of Vocational Studies Delhi University This Program Will Encrypt Or Decrypt Ant Text Document Its A Complete Bug Free Program If Modified Please Send To : sid_isin@yahoo.com */ /* This Program Will Encrypt Any Type Of Text Document */ #include<fstream.h> #include<conio.h> #include<stdio.h> int main() { char name[30],target[30],ch,mod; //Declare Variables int num[100],i,option; cout<<"Enter Your Option "; cout<<" 1. To Encrypt The File "; cout<<" 2. To Decrypt The File "; cout<<" Option : "; cin>>option; if(option==1) { cout<<"Enter The Path Of A File Which Is To Be Encrypted : "; gets(name); ifstream fin(name,ios::binary); //Open The Input File In A Binary Mode if(!fin) { //Show Error Occur If File Does Not Exist cout<<" Error In Openinig Of A File : "; //Or Any Error Occurs return 1; } cout<<" Enter The New Encrypted File Name : "; gets(target); ofstream fout(target,ios::binary); //Open The OutPut File In A Binary Mode if(!fout) { cout<<" Error In Opening Of Target File : "; //Show Error If Any Error Occrs In Opening Of A File return 1; } for(i=0;i<9;i++) { //Multiple For Loops For Storing The Numbers num[i]=i; //In An Array } for(i=14;i<31;i++) //Loops Will Store 100 Numbers { num[i-5]=i; //Which Will Encrypt The Contents Of A File } for(i=33;i<=68;i++) //To Avoid The Error Ocuur Caused By The { //Enter Key , Tab Key & Space Key num[i-7]=i; //These Variations In Loops Is Made } for(i=97;i<=122;i++) { num[i-35]=i; } while(fin) { //Open The Input File fin.get(ch); if(ch==EOF)break; //Exit To Loop When End Of File if((ch>=97) && (ch<=122)) { //Encrypt The Small Letters i=97; mod=num[ch-i]; fout<<mod; } if((ch>=65) && (ch<=90)) { i=39; //Encrypt The Capital Letters mod=num[ch-i]; //And Store In An Output File fout<<mod; } if((ch>=48) && (ch<=57)) { i=4; //Encrypt The Numbers mod=num[ch+i]; fout<<mod; } if((ch==10)||(ch==13)) { mod=ch; //For Enter Key fout<<mod; } if(ch==32) fout<<ch; //For Space Key if(ch==9) fout<<ch; //For Tab Key if((ch>=33)&&(ch<=47)) { //For Special Symbols mod=ch+64; fout<<mod; } if((ch>=58)&&(ch<=64)) { //For Special Symbols mod=ch+54; fout<<mod; } if((ch>=91)&&(ch<=96)) { mod=ch+28; //For Special Symbols fout<<mod; } if((ch>=123)&&(ch<=126)) { mod=ch-40; //For Special Symbols fout<<mod; } } fin.close(); //Close The Input File fout.close(); //Close The Output File cout<<" Your File Is Encrypted Now........... "; getch(); return 0; } /*======================================================================== =======================================*/ /* This Program Will Decrypt The Document */ if(option==2) { char name[30],target[30],ch,mod; //Declare Variables int num[100],i,flag; cout<<"Enter The Path Of A File Name Which Is To Be Decrypted : "; gets(name); ifstream fin(name,ios::binary); if(!fin) //Open The Encryped File In A Binary Mode { cout<<"Error In Opening Of A File : "; return 1; //Show Error If File Does Not Exist } //Or Any Occurs In Opening Of A File cout<<" Enter The New Decrypted File Name : "; gets(target); ofstream fout; fout.open(target,ios::binary); //Opens The Output File In An Binary Mode if(!fout) { //Show Error If Any Error Occurs In Opening Of A File cout<<"Error In Opening Of A Target File : "; return 1; } for(i=0;i<9;i++) { //Same Multiple For Loops For Storing The Numbers num[i]=i; //In An Array } for(i=14;i<31;i++) { num[i-5]=i; //Loops Will Store 100 Numbers } for(i=33;i<=68;i++) //Which Encrypts The Document Also Decrypt It { num[i-7]=i; } while(fin) { //Opens The Encryped File fin.get(ch); flag=0; //Turn Off Flag if(ch==EOF)break; for(i=26;i<52;i++) { if(ch==num[i]) //Loop For Match The Small Letters Letters { mod=i+39; //If Match Then Put Appropriate Letter fout<<mod; //In A OutPut File flag=1; break ; //Turn On Flag And Exit The Loop } } if (flag==1) continue ; //If Flag Is On Then Continue Outer Loop for(i=0;i<26;i++) { //Loop For Match The Capital Letters if(ch==num[i]) { //If Match Then Put Appropriate Letter mod=i+97; //In A OutPut File fout<<mod; flag=1;break; //Turn On Flag And Exit From This Loop } } if (flag==1) continue ; //If Flag Is On Then Continue Outer Loop for(i=52;i<62;i++) { //Loop For Numerical Numbers if(ch==num[i]) { mod=i-4; fout<<mod; flag=1; break ; } } if (flag==1) continue ; if((ch==10)||(ch==13)) { mod=ch; //Condition For Enter Key fout<<mod; } if(ch==32) fout<<ch; //Condition For Space Key if(ch==9) fout<<ch; //Condition For Tab Key if((ch>=97)&&(ch<=111)) { mod=ch-64; //For Special Symbols fout<<mod; } if((ch>=112)&&(ch<=118)) { mod=ch-54; //For Special Symbols fout<<mod; } if((ch>=119)&&(ch<=124)) { mod=ch-28; //For Special Symbols fout<<mod; } if((ch>=83)&&(ch<=86)) { //For Special Symbols mod=ch+40; fout<<mod; } } fin.close(); //Close The Encrypted File fout.close(); //Close Your Original Decrypted File cout<<" The File Is Being Decrypted............ "; getch(); return 0; } return 0; }

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