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Title encryption and decryption of files
Author m p kiran
Author Email mpkiran525 [at] yahoo.co.in
Description usally for encryption and ecryption the software being used
will be associate with password by which an un-authorized user with that
same software can decrypt, so in this program evelope by me with new
algorithm for encryption an ecryption in which password is associated with
encrypted file which provides security from un-authorized users of that
encrypted file.there will come two extra unreable characters at the end of
decrypted file which indicates decryption of entire file.
Category C » Beginners / Lab Assignments
Hits 366793
Code Select and Copy the Code
In main function we declare required variable. printf(" enter choice 1)encode 2)view ecoded file 3) decode 4)view decoced file 5)exit ------"); // this is to print the main menu scanf("%d",&ch); // entering of choice while(ch!=5) // until choice is exit { if(ch==1) //if choice is to encrypt { scanf("%s",name); // accept file name scanf("%c",&ff); //accept the choice of change // the file position or not if(ff=='c'||ff=='C') {strcpy(encri,ruf);scanf("%s",encri);} // so as to change enter file path cscanf("%s",pass); // enter password l=strlen(pass); // l =string length of password st=fopen(name,"r"); // open the file to be encrypted ed=fopen(encri,"w"); // open the file to where to be // encrypted while(!feof(st)) // until end of file to be encrypted { x=fgetc(st); // read each character into X fputc(x+pass[i++%l],ed); // write the sum of X and password } // char fclose(st); // close first file fclose(ed); // close second file } if(ch==3) // if choice is decryption { scanf(ǣ%s?,encri); //enter the file name to be decrypted ed=fopen(encri,"r"); //open the above mentioned file scanf("%c",&ff); //accept the choice of change // the file position or not if(ff=='c'||ff=='C') { strcpy(decri,ruf); scanf("%s",decri); // so as to change enter file path } cscanf("%s",pass); // enter password de=fopen(decri,"w"); //open a file to store decoded data while(!feof(ed)) // until end of file to be encrypted { x=fgetc(ed); // read each character into X fputc(x-pass[i++%l],de); // write the sum of X and password } // char fclose(ed); // close first file fclose(de); // close second file } if(ch==2) //if choice is to view the contents encoded file { ed=fopen(encri,"r"); //open that file and read each character while(!feof(ed)) printf("%c",fgetc(ed)); //print them until end of file fclose(ed); // close this file } if(ch==4) //if choice is to view the contents decoded file { ed=fopen(decri,"r"); //open that file and read each character while(!feof(ed)) printf("%c",fgetc(ed)) ; //print them until end of file fclose(ed) ; // close this file } scanf("%d",&ch); // enter the choice from menu } // end while } // end main

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