C＃：如何生成长度为7或8个字符的唯一密码

Question

I need to repeated generate unique password many times, Ensure that every time the generated passwords are unique, Please help me.

Thanks!

Answer 1

If you want to generate uniq password every time than

take CurrentTIME and CurrrentDATE in account because by this you can able to create new password.

have look to this resolve your problem : generating a batch of random passwords

Answer 2

Try this

http://www.yetanotherchris.me/home/2009/3/15/c-pronounceable-password-generator.html

Answer 3

So here is another method which generates cryptedRandom password and a thread safe...

    private string CryptedRandomString()
    {
        lock (this)
        {
            int rand = 0;

            byte[] randomNumber = new byte[5];

            RNGCryptoServiceProvider Gen = new RNGCryptoServiceProvider();
            Gen.GetBytes(randomNumber);

            rand = Math.Abs(BitConverter.ToInt32(randomNumber, 0));

            return ConvertIntToStr(rand);
        }
    }

    private string ConvertIntToStr(int input)
    {
        lock (this)
        {
            string output = "";
            while (input > 0)
            {
                int current = input % 10;
                input /= 10;

                if (current == 0)
                    current = 10;

                output = (char)((char)'A' + (current - 1)) + output;
            }
            return output;
        }

    }

Now you can call this method like this: -

string GeneratedPassword = "";

GeneratedPassword = CryptedRandomString() + CryptedRandomString();

Console.WriteLine(GeneratedPassword.Substring(0,8));

Now you all must be wondering why GeneratedPassword = CryptedRandomString() + CryptedRandomString(); , the reason I called CryptedRamdomString() method twice is just to make sure it returns more then 10 digits so as it will be easier to get eight character passwords otherwise if it is called once then sometimes it will generate less then eight character password.

Well you must consider one thing before using this method that generating random numbers using "RNGCryptoServiceProvider " is bit time consuming then Random.Next. But "RNGCryptoServiceProvider " is much more secure then "Random.Next" .

Answer 4

I'd define an array of possible characters for the password alphabet, and then generate 7 or 8 random indexes into that array to create a password.

This would need to be refined if you want to guarantee a minimum number of each character type, etc.

Answer 5

你说全球独特的字符串？

System.Guid.NewGuid().ToString()