Description of Algorithm

A simple algorithm works with & play with an ASCII value of characters.

Algorithm works within 6 different steps.

Step 1: Convert input string characters in respected ASCII codes & store it in array like below mentioned example of C# code.

  1. ArrayList asciiArr = new ArrayList();
  3. for (int i = 0; i < inputString.Length; i++) {
  4. asciiArr.Add((int) Convert.ToChar(inputString[i]));
  5. }
  6. or(i = 0; i < inputString.length; i++) {
  7. asciiArr[i] = inputString[i].charCodeAt(0);
  8. }
Step 2: Fill A to Z array in capital or small letters.
  1. ArrayList atozArr = new ArrayList();
  3. for (int i = 0, j = 65; i < 26; i++, j++)
  4. {
  5. atozArr.Add((char) j);
  6. }
Step 3: Choose randomly single character index from A to Z and differentiate it's position in one variable & it's respected ASCII value in second variable.

Note: Here i'm referencing an function return a random value from minimum - maximum range.

int positionAscii = Convert.ToInt32(atozArr[(new Random()).Next(26)]);

Step 4: Addition of every input String each element to positionAscii.
  1. ArrayList outputArr = new ArrayList();
  3. for (int i = 0; i < inputString.Length; i++) {
  4. outputArr.Add(Convert.ToInt32(asciiArr[i]) + positionAscii);
  5. }
  7. int[] k = (int[]) outputArr.ToArray(System.Type.GetType("System.Int32"));
  9. Console.Write("\nCipher Text: \n\n");
  11. foreach(int i in k) {
  12. cipherText = cipherText + (char) i;
  13. }
Step 5: Attachment of key to encrypted string or not it's your choice & it's your modification scenario, here i am attaching a key with an encrypted string:
  1. if (inputString.Length.Equals(cipherText.Length))
  2. {
  3. cipherText = cipherText + (char)positionAscii;
  4. }
Step 6: Finally your encryption is ready to send.
  1. return cipherText;
cmd

For decryption process reverse steps apply.

Note: Every time cypher text will change due to selection of randomposition from A to Z.

Below mention code is print your output cipher text to text file.
  1. string output = "";
  2. // Write each directory name to a file.
  3. using (StreamWriter sw = new StreamWriter("output.txt"))
  4. {
  5. output = encryption(input);
  6. sw.WriteLine(output);
  7. }
C# Code for Practice
  1. function encryption() {
  2. using System;
  3. using System.Collections.Generic;
  4. using System.Linq;
  5. using System.Text;
  6. using System.Collections;
  7. using System.IO;
  9. namespace Codeblank {
  10. class Program {
  11. private static string encryption(string inputString) {
  12. string cipherText = "";
  14. //Step : 1
  15. //Convert input string characters in respected ascii codes & store it in array like below mentioned example of C# code.
  17. ArrayList asciiArr = new ArrayList();
  19. for (int i = 0; i < inputString.Length; i++) {
  20. asciiArr.Add((int) Convert.ToChar(inputString[i]));
  21. }
  23. //Step : 2
  24. //Fill A to Z array in capital or small letters
  26. ArrayList atozArr = new ArrayList();
  28. for (int i = 0, j = 65; i < 26; i++, j++) {
  29. atozArr.Add((char) j);
  30. }
  32. //Step : 3
  33. // Choose randomly single character index from A to Z and differentiate it's position in one variable & it's respected ascii value in second variable
  34. //Note: Here i'm referencing an function return a random value from minimum - maximum range.
  36. int positionAscii = Convert.ToInt32(atozArr[(new Random()).Next(26)]);
  38. //Step : 4
  39. //Addition of every input String each element to positionAscii
  41. ArrayList outputArr = new ArrayList();
  43. for (int i = 0; i < inputString.Length; i++) {
  44. outputArr.Add(Convert.ToInt32(asciiArr[i]) + positionAscii);
  45. }
  47. int[] k = (int[]) outputArr.ToArray(System.Type.GetType("System.Int32"));
  49. Console.Write("\nCipher Text: \n\n");
  51. foreach(int i in k) {
  52. cipherText = cipherText + (char) i;
  53. }
  55. //Step : 5
  56. //Attachment of key to encrypted string or not it's your choice & it's your modification scenario, here i'm attaching a key with an encrypted string
  58. if (inputString.Length.Equals(cipherText.Length)) {
  59. cipherText = cipherText + (char) positionAscii;
  60. }
  62. //Step : 6
  63. //Finally your encryption is ready to send
  64. return cipherText;
  65. }
  67. private static string decryption(string cipherText) {
  68. //Step : 1
  69. //Take decryption key from cipherText
  71. int positionAscii = Convert.ToInt32(cipherText[cipherText.Length - 1]);
  73. //Step : 2
  74. //Substract value of key from each characters of cipherText
  76. string plainText = "";
  78. foreach(int i in cipherText) {
  79. plainText = plainText + (char)(Convert.ToInt32(i) - positionAscii);
  80. }
  82. return plainText;
  83. }
  85. static void Main(string[] args) {
  86. Console.Write("Plain Text: \n\n");
  87. string input = Console.ReadLine();
  88. string output = "";
  89. // Write each directory name to a file.
  90. using(StreamWriter sw = new StreamWriter("output.txt")) {
  91. output = encryption(input);
  92. sw.WriteLine(output);
  93. }
  94. Console.Write(output);
  95. Console.WriteLine("\n\nAfter Decryption Plain Text: \n\n" + decryption(output));
  96. Console.ReadKey();
  98. }
  99. }
  100. }
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