Password creation

Question

Q1-Write a console program for password is not like words in dictionary.

Vulpes · Answer

To do that you need a large dictionary to check the proposed passwords against, preferably a free one. The following assumes you're using the MS Word dictionary and .NET 4.0 (VS 2010) or later. To do so you need to add a reference to the Microsoft Word Object Library (version 12.0 or later) which is under the COM tab: using System; using Word = Microsoft.Office.Interop.Word; class Program { static void Main() { var wordApp = new Word.Application(); wordApp.Visible = false; while(true) { Console.Write("Enter proposed password or q to quit : "); string password = Console.ReadLine().Trim(); if(password == "") continue; string checkword = password.ToLower(); if (checkword == "q") break; bool inDictionary = wordApp.CheckSpelling(checkword); if (inDictionary) { Console.WriteLine("'{0}' is in the dictionary, so is NOT a suitable password", password); } else { Console.WriteLine("'{0}' is NOT in the dictionary and so MIGHT be a suitable password", password); } Console.WriteLine(); } wordApp.Quit(); } } Note that this approach is far from perfect as there are some words (such as countries or well known place names) which won't be in a normal dictionary. You really need to combine potentially suitable words with digits or special characters to produce reasonably strong passwords.

sriballabha Rout · Answer

I want the program as dynamic.In the output screen i enter some word and it will check it is in dictionary or not.

Vulpes · Answer

Well, one way to ensure that your passwords don't appear in the dictionary is to include digits in them. The following program generates random passwords between 8 and 12 characters in length which include exactly two digits. The remaining characters are upper or lower case letters: using System; class Password { static Random r = new Random(); static void Main() { // create and print out 10 random password for(int i = 0; i Console.WriteLine(CreatePassword()); Console.ReadKey(); } static string CreatePassword() { /* between 8 and 12 characters upper and lower case letters and exactly two digits repetitions allowed */ int len = r.Next(8, 13); // length of password var chars = new char[len]; // get 'len' random letters for(int i = 0; i { int n = r.Next(52); if (n chars[i] = (char)(65 + n); // A - Z, ASCII 65 to 90 else chars[i] = (char)(71 + n); // a - z, ASCII 97 to 122 } int digitIndex1 = r.Next(len); // index of first digit; int digitIndex2; // index of second digit do { digitIndex2 = r.Next(len); } while(digitIndex2 == digitIndex1); int d1 = r.Next(10); // first random digit chars[digitIndex1] = (char)(d1 + 48); // 0 - 9, ASCII 48 to 57 int d2 = r.Next(10); // second random digit chars[digitIndex2] = (char)(d2 + 48); return new string(chars); } } /* sample output - will be different each time of course */ Sceeo63Kifr N1TfBB1jyqA Nvgitjf2L2S nC6rxaf9 QEYW36jBhw iQB3arsD2Rj 33SuPuYXCfHG 0jBttXf5 TmQyZ9NZ6n m4axRhSf2EL