ENCRYPTION AND DECRYPTION

Encryption is a process that changes a code which can be understood to be a code that can not be understood (illegible). Encryption can be interpreted as a code or cipher. A cipher using an algorithm that can encode all data streams (stream) bits of a message into an incomprehensible cryptogram (unintelligible). Because cipher technique is a system that has been prepared for the automation, then the technique used in computer and network security systems.

While the description is a process to return the results of a cipher to the code beginning or the beginning of the data entered.

Algorithm.
• Encryption
   Print encryption algorithm
   Declaration:
     plain, cipher: string
     key, i: Integer

   Description:
      read (key, plain)
      for i = 0 to strlen (plain) do
             ciphers [i] <= (plain [i] + key) mod 128;
             end for
      write (cipher)

• Description
    Print a description of the algorithm
    Declaration:
      ciphers, text: string
      key, i: Integer

    Description:
      read (key, cipher)
      for i = 0 to strlen (cipher) do
             text [i] <= (cipher [i] - key) mod 128;
             end for
     write (text)

Encryption Program And Description In C + +.

# Include <cstdlib>
# Include <iostream>


using namespace std;
cryptography class {
    friend istream & operator>> (istream &, cryptography &);
    friend ostream & operator <<(ostream &, cryptography &);
             
  public:
      cryptography ();
      void encryption ();
      void description ();
  
  private:
      char plain [100], cipher [100], text [26];
      int key;
      };
              
cryptography:: cryptography () {
     court <<"\ t \ tSlamet Islan Al Hidayah" <<endl;
     court <<"\ t \ t 10018075" <<endl;
     court <<endl;
     court <<"Program To encrypt and Description Text \ n \ n";
     court <<endl;
     }
              
istream & operator>> (istream & ins, cryptography & mlebu) {
     court <<"Enter key:";
     in>> mlebu.key;
     court <<"Enter character:";
     in>> mlebu.plain;
     return in;
     }
      
void cryptography: encryption () {
  for (int i = 0; i <strlen (plain); i + +) {
     ciphers [i] = (plain [i] + key)% 128;}
     court <<endl <<endl;
     }
     
void cryptography:: description () {
   for (int i = 0; i <strlen (cipher); i + +) {
     text [i] = (cipher [i]-key)% 128;}
     }
     
ostream & operator <<(ostream & out, cryptography & metu) {
    out <<"the result of encryption:";
    for (int i = 0; i <strlen (metu.plain); i + +) {
       out <<metu.chiper [i];
       }
       out <<endl;
       out <<"the description:";
       for (int j = 0; j <strlen (metu.chiper); j + +) {
          court <<metu.teks [j];
          }
      out <<endl <<endl;
      return out;
      }
         
          
int main (int argc, char * argv [])
{
  cryptography x;
  cin>> x;
  x.enkripsi ();
  x.deskripsi ();
  court <<x;
    
  system ("PAUSE");
  return EXIT_SUCCESS;
}

Output :

Well that's the program that I can make,,,,,!

If there are less jelass know any mistake, do not hesitate to leave a comment ataun advice. So that I can fix it later terimakasihh over his visit,,

Regards super ..

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