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Simple Password Generator

, 18 Dec 2013 CPOL 13.1K 24
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Simple password generator, based on alphabets


Sometimes you need to create words from a given alphabet, so I'd like to share a very simple solution. The solution is scalable, so you can add your own alphabet. Let's take a look at the code.

Using the Code

The code consists of several classes:

  • AlphabetDictionaries - predefined alphabets
  • AlphabetWordGenerator - generate word accordingly alphabet

public static class AlphabetDictionaries
    public const string EnglishLowerCase = "abcdefghijklmnopqrstuvwxyz";
    public const string EnglishUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    public const string Numeric = "0123456789";
    public const string SpecialSymbols = "`~!@#$%^&*()-_=+[]{}\\|;:'\",<.>/?";

Here's main and only one class - AlphabetWordGenerator

public sealed class AlphabetWordGenerator : IWordGenerator
    private readonly string _alphabet;
    private readonly RNGCryptoServiceProvider _provider = new RNGCryptoServiceProvider();

    public AlphabetWordGenerator(ICollection<string> alphabets)
        if (alphabets == null || alphabets.Count == 0)
            throw new ArgumentException("Alphabets is null or empty");
        if (alphabets.Any(string.IsNullOrWhiteSpace))
            throw new ArgumentException("Alphabet should not be ampty");
        _alphabet = string.Join(string.Empty, alphabets);

    public AlphabetWordGenerator(string alphabet)
        : this(new[] { alphabet })

    public string Generate(int wordLength)
        if (wordLength < 1)
            throw new IndexOutOfRangeException("wordLength is out of range");
        return DoGenerate(wordLength);

    private string DoGenerate(int wordLength)
        var repository = new List<char>(wordLength);
        var data = new byte[wordLength];
        foreach (byte item in data)
            int index = Convert.ToInt32(item)%_alphabet.Length;
            char symbol = _alphabet[index];
        return string.Join(string.Empty, repository);

Let's create a word with lowercase English letters:

var generator = new AlphabetWordGenerator(AlphabetDictionaries.EnglishLowerCase);
var password = generator.Generate(10); 

Result password is equal to uddfxjfbxp 

Another example with several alphabets:

var alphabets = new List<string>

var generator = new AlphabetWordGenerator(alphabets);
var password = generator.Generate(40);    

Result password is equal to [3xH(kzizo@51m@q}qpIYq[CgUBbjKf^3E@JF^T;


  • 26th July, 2012: Initial version
  • 20th December, 2013: Length's been moved to generate method


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Sergey Morenko
Software Developer (Senior)
Russian Federation Russian Federation
B.Sc. in Computer Science.

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Comments and Discussions

SuggestionDoes what it says Pin
John Brett19-Dec-13 4:30
memberJohn Brett19-Dec-13 4:30 
GeneralRe: Does what it says Pin
Sergey Morenko20-Dec-13 9:06
professionalSergey Morenko20-Dec-13 9:06 
Question[My vote of 2] 2 Easier Way Pin
Kevin Marois26-Jul-12 7:01
memberKevin Marois26-Jul-12 7:01 
AnswerRe: [My vote of 2] 2 Easier Way Pin
GSerjo26-Jul-12 7:18
memberGSerjo26-Jul-12 7:18 
You are mistaken, as per msdn

The GetRandomFileName method returns a cryptographically strong, random string that can be used as either a folder name or a file name. Unlike GetTempFileName, GetRandomFileName does not create a file. When the security of your file system is paramount, this method should be used instead of GetTempFileName.

The article shows how to create password based on given alphabet, it's more than just random string

-- modified 18-Dec-13 13:29pm.
GeneralRe: [My vote of 2] 2 Easier Way Pin
Kevin Marois26-Jul-12 7:27
memberKevin Marois26-Jul-12 7:27 
GeneralRe: [My vote of 2] 2 Easier Way Pin
GSerjo26-Jul-12 7:40
memberGSerjo26-Jul-12 7:40 
GeneralRe: [My vote of 2] 2 Easier Way Pin
Caner Korkmaz26-Jul-12 8:33
memberCaner Korkmaz26-Jul-12 8:33 
GeneralMy vote of 5 Pin
zhanazhan25-Jul-12 17:50
memberzhanazhan25-Jul-12 17:50 
GeneralRe: My vote of 5 Pin
GSerjo25-Jul-12 19:18
memberGSerjo25-Jul-12 19:18 

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