Caesar cipher, decrypted by Caesar encryption.

Using System;
Using System.Collections.Generic;
Using System.ComponentModel;
Using System.Data;
Using System.Drawing;
Using System.Linq;
Using System.Text;

Using System.Windows.Forms; namespace Caesararithmetic {public partial class Frm_main:form {int ishifting = 5;//default offset 5 Publ
        IC Frm_main () {InitializeComponent ();
            }//Get ASCII public int ASCII (string str) {byte[] array = new byte[1];//for character to create byte array Array = System.Text.Encoding.ASCII.GetBytes (str);//Assignment int asciicode = (short) (array[0) for a byte array;//Get the number of bytes
            The first entry of the group return asciicode;//returns the first item of the byte array} public string Caesar (String str)/Caesar encryption algorithm implementation { Char[] C = str. ToCharArray ();//create character array string strcaesar = "";//define a variable to store the encrypted string for (int i = 0; I < Str. Length; i++)//traversal of each string in the string {string ins = C[i]. ToString ();//the character int to which the record is traversediins = AscII (INS); String outs = "";//define a variable to record the encrypted string bool Ischar = "0123456789abcdefghijklmnopqrstuvwxyz". Contains (Ins. ToLower ())//To determine whether the specified string contains the traversed character bool Istoupperchar = Ischar && (ins. ToUpper () = ins);//Determine if the character being traversed is uppercase ins = Ins. ToLower ();//Converts the traversed character to a lowercase if (ischar)//To determine whether the specified string contains the characters that are traversed to {CONSOLE.WR

                   Iteline ("ins = {0}, a = {1}, Z={2},ascii (INS) ={3}", Ins, ASCII ("a"), ASCII ("Z"), ASCII (INS)); int offset = (ASCII (INS) + Ishifting-ascii ("a"))% (ASCII ("Z")-ASCII ("a") + 1);//Get the AscII code of the character Cons Ole.
                    WriteLine ("({0} + 5-97)% (122-97 + 1)", AscII (INS));

                    Console.WriteLine ("Offset={0}", offset); Outs = Convert.tochar (offset + AscII ("a")). ToString ();//converts to a character and records if (Istoupperchar)//is capitalized {outs = Outs. ToUpper ()//Convert Allis uppercase}} else {outs = ins;//record traversal 
        The character} Strcaesar + + outs;//added to the encrypted string} return strcaesar;//returns the encrypted string } private void Button1_Click (object sender, EventArgs e) {string p_str_code = Textb Ox1. text;//record the password to be encrypted TextBox2.Text = Caesar (P_str_code);//display encrypted string} private void Button2_Click (o Bject sender, EventArgs e) {string p_str_code = textbox2.text;//record password to decrypt TextBox2.Text = Ca ESAR2 (P_str_code),//display decrypted string} public string Caesar2 (String str)/Caesar encryption algorithm implementation {char[ ] C = str. ToCharArray ();//create character array string strcaesar = "";//define a variable to store the encrypted string for (int i = 0; I < Str. Length; i++)//traversal of each string in the string {string ins = C[i]. ToString ();//log traversal to the character string outs = "";//define a variable to recordEncrypted string bool Ischar = "0123456789abcdefghijklmnopqrstuvwxyz". Contains (Ins. ToLower ())//To determine whether the specified string contains the traversed character bool Istoupperchar = Ischar && (ins. ToUpper () = ins);//Determine if the character being traversed is uppercase ins = Ins. ToLower ();//Converts the traversed character to lowercase if (ischar)//Determines whether the specified string contains the character {int iins = AscII (
                 INS);
                 Console.WriteLine ("ins = {0}, a = {1}, z={2}", Iins, ASCII ("a"), ASCII ("Z"));  int offset = (ASCII (INS) + 5-ascii ("a"))% (ASCII ("Z")-ASCII ("a") + 1);//Get the AscII code of the character//int offset = (ASCII (INS) + 5-ascii ("a"))% (ASCII ("Z")-ASCII ("a") + 1);//Get the ASCII int offset = (ASCII ("z") + I of the character)  
                 
                 Shifting-ascii (INS))% (ASCII ("Z")-ASCII ("a") + 1);

                 Console.WriteLine ("offset = {0}", offset); Outs = Convert.tochar (offset + AscII ("a")). ToString ();//convert to character and record outs = Convert.tochar (AscII ("z")-offsET). ToString ();//converts to a character and records if (Istoupperchar)//is capitalized {outs = outs.

              ToUpper ();//all converted to uppercase} Console.WriteLine ("Outs = {0}", outs); else {outs = ins;//log Traversal character} Strcaesar + = Outs
 ;//Add to encrypted string} return strcaesar;//returns encrypted string}}}