关于C#:生成随机密码

Generating Random Passwords

当我们网站上的一个用户丢失了他的密码并进入丢失的密码页面时,我们需要给他一个新的临时密码。我真的不介意这是多么随机,或者如果它符合所有"需要"的强密码规则,我只想给他们一个密码,他们可以稍后更改。

该应用程序是用C语言编写的Web应用程序。所以我在考虑如何卑鄙地使用guid的一部分。即

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Guid.NewGuid().ToString("d").Substring(1,8)

Suggesstions?思想?


总是有System.Web.Security.Membership.GeneratePassword(int length, int numberOfNonAlphanumericCharacters


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public string CreatePassword(int length)
{
        const string valid ="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
        StringBuilder res = new StringBuilder();
        Random rnd = new Random();
        while (0 < length--)
        {
            res.Append(valid[rnd.Next(valid.Length)]);
        }
        return res.ToString();
}

这有一个很好的好处,就是能够从可用字符列表中为生成的密码进行选择(例如,仅数字、仅大写或仅小写等)。


我的代码的主要目标是:

  • 弦的分布几乎是一致的(不关心微小的偏差,只要它们很小)
  • 它为每个参数集输出超过数十亿个字符串。如果您的prng只生成20亿(31位熵)的不同值,那么生成8个字符的字符串(大约47位熵)是没有意义的。
  • 它是安全的,因为我希望人们将它用于密码或其他安全令牌。
  • 第一个属性是通过对字母大小取64位值模来实现的。对于小字母(如问题中的62个字符),这会导致可忽略的偏差。第二和第三属性是通过使用RNGCryptoServiceProvider而不是System.Random实现的。

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    using System;
    using System.Security.Cryptography;

    public static string GetRandomAlphanumericString(int length)
    {
        const string alphanumericCharacters =
           "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
           "abcdefghijklmnopqrstuvwxyz" +
           "0123456789";
        return GetRandomString(length, alphanumericCharacters);
    }

    public static string GetRandomString(int length, IEnumerable<char> characterSet)
    {
        if (length < 0)
            throw new ArgumentException("length must not be negative","length");
        if (length > int.MaxValue / 8) // 250 million chars ought to be enough for anybody
            throw new ArgumentException("length is too big","length");
        if (characterSet == null)
            throw new ArgumentNullException("characterSet");
        var characterArray = characterSet.Distinct().ToArray();
        if (characterArray.Length == 0)
            throw new ArgumentException("characterSet must not be empty","characterSet");

        var bytes = new byte[length * 8];
        new RNGCryptoServiceProvider().GetBytes(bytes);
        var result = new char[length];
        for (int i = 0; i < length; i++)
        {
            ulong value = BitConverter.ToUInt64(bytes, i * 8);
            result[i] = characterArray[value % (uint)characterArray.Length];
        }
        return new string(result);
    }

    (这是我对如何在C中生成随机8个字符、字母数字字符串的答案的副本)


    以下是我如何生成随机令牌:

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    public string GenerateToken(int length)
    {
        RNGCryptoServiceProvider cryptRNG = new RNGCryptoServiceProvider();
        byte[] tokenBuffer = new byte[length];
        cryptRNG.GetBytes(tokenBuffer);
        return Convert.ToBase64String(tokenBuffer);
    }

    需要注意的是,由于返回的是base-64字符串,因此输出长度始终是4的倍数,额外的空间使用=作为填充字符。length参数指定字节缓冲区的长度,而不是输出字符串(因此可能不是该参数的最佳名称,现在我考虑一下)。这控制密码的熵字节数。但是,由于base-64使用4个字符的块来对每3个字节的输入进行编码,如果您要求的长度不是3的倍数,则会有一些额外的"空间",它将使用=来填充多余的部分。

    如果您出于任何原因不喜欢使用base-64字符串,您可以将Convert.ToBase64String()调用替换为转换为常规字符串,或者替换为任何Encoding方法;例如Encoding.UTF8.GetString(tokenBuffer)—只需确保您选择一个字符集,该字符集可以表示从RNG中发出的所有值,并且生成的字符是无论你在哪里发送或存储这个。例如,使用Unicode往往会提供大量的中文字符。使用base-64可以保证广泛兼容的字符集,而且只要使用合适的哈希算法,这样的字符串的特性就不会降低它的安全性。


    这要大得多,但我认为它看起来更全面一些:http://www.obviex.com/samples/password.aspx

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    ///////////////////////////////////////////////////////////////////////////////
    // SAMPLE: Generates random password, which complies with the strong password
    //         rules and does not contain ambiguous characters.
    //
    // To run this sample, create a new Visual C# project using the Console
    // Application template and replace the contents of the Class1.cs file with
    // the code below.
    //
    // THIS CODE AND INFORMATION IS PROVIDED"AS IS" WITHOUT WARRANTY OF ANY KIND,
    // EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
    // WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
    //
    // Copyright (C) 2004 Obviex(TM). All rights reserved.
    //
    using System;
    using System.Security.Cryptography;

    /// <summary>
    /// This class can generate random passwords, which do not include ambiguous
    /// characters, such as I, l, and 1. The generated password will be made of
    /// 7-bit ASCII symbols. Every four characters will include one lower case
    /// character, one upper case character, one number, and one special symbol
    /// (such as '%') in a random order. The password will always start with an
    /// alpha-numeric character; it will not start with a special symbol (we do
    /// this because some back-end systems do not like certain special
    /// characters in the first position).
    /// </summary>
    public class RandomPassword
    {
        // Define default min and max password lengths.
        private static int DEFAULT_MIN_PASSWORD_LENGTH  = 8;
        private static int DEFAULT_MAX_PASSWORD_LENGTH  = 10;

        // Define supported password characters divided into groups.
        // You can add (or remove) characters to (from) these groups.
        private static string PASSWORD_CHARS_LCASE  ="abcdefgijkmnopqrstwxyz";
        private static string PASSWORD_CHARS_UCASE  ="ABCDEFGHJKLMNPQRSTWXYZ";
        private static string PASSWORD_CHARS_NUMERIC="23456789";
        private static string PASSWORD_CHARS_SPECIAL="*$-+?_&=!%{}/";

        /// <summary>
        /// Generates a random password.
        /// </summary>
        /// <returns>
        /// Randomly generated password.
        /// </returns>
        /// <remarks>
        /// The length of the generated password will be determined at
        /// random. It will be no shorter than the minimum default and
        /// no longer than maximum default.
        /// </remarks>
        public static string Generate()
        {
            return Generate(DEFAULT_MIN_PASSWORD_LENGTH,
                            DEFAULT_MAX_PASSWORD_LENGTH);
        }

        /// <summary>
        /// Generates a random password of the exact length.
        /// </summary>
        /// <param name="length">
        /// Exact password length.
        /// </param>
        /// <returns>
        /// Randomly generated password.
        /// </returns>
        public static string Generate(int length)
        {
            return Generate(length, length);
        }

        /// <summary>
        /// Generates a random password.
        /// </summary>
        /// <param name="minLength">
        /// Minimum password length.
        /// </param>
        /// <param name="maxLength">
        /// Maximum password length.
        /// </param>
        /// <returns>
        /// Randomly generated password.
        /// </returns>
        /// <remarks>
        /// The length of the generated password will be determined at
        /// random and it will fall with the range determined by the
        /// function parameters.
        /// </remarks>
        public static string Generate(int   minLength,
                                      int   maxLength)
        {
            // Make sure that input parameters are valid.
            if (minLength <= 0 || maxLength <= 0 || minLength > maxLength)
                return null;

            // Create a local array containing supported password characters
            // grouped by types. You can remove character groups from this
            // array, but doing so will weaken the password strength.
            char[][] charGroups = new char[][]
            {
                PASSWORD_CHARS_LCASE.ToCharArray(),
                PASSWORD_CHARS_UCASE.ToCharArray(),
                PASSWORD_CHARS_NUMERIC.ToCharArray(),
                PASSWORD_CHARS_SPECIAL.ToCharArray()
            };

            // Use this array to track the number of unused characters in each
            // character group.
            int[] charsLeftInGroup = new int[charGroups.Length];

            // Initially, all characters in each group are not used.
            for (int i=0; i<charsLeftInGroup.Length; i++)
                charsLeftInGroup[i] = charGroups[i].Length;

            // Use this array to track (iterate through) unused character groups.
            int[] leftGroupsOrder = new int[charGroups.Length];

            // Initially, all character groups are not used.
            for (int i=0; i<leftGroupsOrder.Length; i++)
                leftGroupsOrder[i] = i;

            // Because we cannot use the default randomizer, which is based on the
            // current time (it will produce the same"random" number within a
            // second), we will use a random number generator to seed the
            // randomizer.

            // Use a 4-byte array to fill it with random bytes and convert it then
            // to an integer value.
            byte[] randomBytes = new byte[4];

            // Generate 4 random bytes.
            RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
            rng.GetBytes(randomBytes);

            // Convert 4 bytes into a 32-bit integer value.
            int seed = BitConverter.ToInt32(randomBytes, 0);

            // Now, this is real randomization.
            Random  random  = new Random(seed);

            // This array will hold password characters.
            char[] password = null;

            // Allocate appropriate memory for the password.
            if (minLength < maxLength)
                password = new char[random.Next(minLength, maxLength+1)];
            else
                password = new char[minLength];

            // Index of the next character to be added to password.
            int nextCharIdx;

            // Index of the next character group to be processed.
            int nextGroupIdx;

            // Index which will be used to track not processed character groups.
            int nextLeftGroupsOrderIdx;

            // Index of the last non-processed character in a group.
            int lastCharIdx;

            // Index of the last non-processed group.
            int lastLeftGroupsOrderIdx = leftGroupsOrder.Length - 1;

            // Generate password characters one at a time.
            for (int i=0; i<password.Length; i++)
            {
                // If only one character group remained unprocessed, process it;
                // otherwise, pick a random character group from the unprocessed
                // group list. To allow a special character to appear in the
                // first position, increment the second parameter of the Next
                // function call by one, i.e. lastLeftGroupsOrderIdx + 1.
                if (lastLeftGroupsOrderIdx == 0)
                    nextLeftGroupsOrderIdx = 0;
                else
                    nextLeftGroupsOrderIdx = random.Next(0,
                                                         lastLeftGroupsOrderIdx);

                // Get the actual index of the character group, from which we will
                // pick the next character.
                nextGroupIdx = leftGroupsOrder[nextLeftGroupsOrderIdx];

                // Get the index of the last unprocessed characters in this group.
                lastCharIdx = charsLeftInGroup[nextGroupIdx] - 1;

                // If only one unprocessed character is left, pick it; otherwise,
                // get a random character from the unused character list.
                if (lastCharIdx == 0)
                    nextCharIdx = 0;
                else
                    nextCharIdx = random.Next(0, lastCharIdx+1);

                // Add this character to the password.
                password[i] = charGroups[nextGroupIdx][nextCharIdx];

                // If we processed the last character in this group, start over.
                if (lastCharIdx == 0)
                    charsLeftInGroup[nextGroupIdx] =
                                              charGroups[nextGroupIdx].Length;
                // There are more unprocessed characters left.
                else
                {
                    // Swap processed character with the last unprocessed character
                    // so that we don't pick it until we process all characters in
                    // this group.
                    if (lastCharIdx != nextCharIdx)
                    {
                        char temp = charGroups[nextGroupIdx][lastCharIdx];
                        charGroups[nextGroupIdx][lastCharIdx] =
                                    charGroups[nextGroupIdx][nextCharIdx];
                        charGroups[nextGroupIdx][nextCharIdx] = temp;
                    }
                    // Decrement the number of unprocessed characters in
                    // this group.
                    charsLeftInGroup[nextGroupIdx]--;
                }

                // If we processed the last group, start all over.
                if (lastLeftGroupsOrderIdx == 0)
                    lastLeftGroupsOrderIdx = leftGroupsOrder.Length - 1;
                // There are more unprocessed groups left.
                else
                {
                    // Swap processed group with the last unprocessed group
                    // so that we don't pick it until we process all groups.
                    if (lastLeftGroupsOrderIdx != nextLeftGroupsOrderIdx)
                    {
                        int temp = leftGroupsOrder[lastLeftGroupsOrderIdx];
                        leftGroupsOrder[lastLeftGroupsOrderIdx] =
                                    leftGroupsOrder[nextLeftGroupsOrderIdx];
                        leftGroupsOrder[nextLeftGroupsOrderIdx] = temp;
                    }
                    // Decrement the number of unprocessed groups.
                    lastLeftGroupsOrderIdx--;
                }
            }

            // Convert password characters into a string and return the result.
            return new string(password);
         }
    }

    /// <summary>
    /// Illustrates the use of the RandomPassword class.
    /// </summary>
    public class RandomPasswordTest
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            // Print 100 randomly generated passwords (8-to-10 char long).
            for (int i=0; i<100; i++)
                Console.WriteLine(RandomPassword.Generate(8, 10));
        }
    }
    //
    // END OF FILE
    ///////////////////////////////////////////////////////////////////////////////


    我知道这是一个旧的线程,但我有一个相当简单的解决方案供某人使用。易于实现、易于理解和验证。

    考虑以下要求:

    I need a random password to be generated which has at least 2 lower-case letters, 2 upper-case letters and 2 numbers. The password must also be a minimum of 8 characters in length.

    以下正则表达式可以验证此情况:

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    ^(?=\b\w*[a-z].*[a-z]\w*\b)(?=\b\w*[A-Z].*[A-Z]\w*\b)(?=\b\w*[0-9].*[0-9]\w*\b)[a-zA-Z0-9]{8,}$

    它不在这个问题的范围之内——但是regex是基于lookahead/lookbehind和lookaround的。

    以下代码将创建一组符合此要求的随机字符:

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    public static string GeneratePassword(int lowercase, int uppercase, int numerics) {
        string lowers ="abcdefghijklmnopqrstuvwxyz";
        string uppers ="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        string number ="0123456789";

        Random random = new Random();

        string generated ="!";
        for (int i = 1; i <= lowercase; i++)
            generated = generated.Insert(
                random.Next(generated.Length),
                lowers[random.Next(lowers.Length - 1)].ToString()
            );

        for (int i = 1; i <= uppercase; i++)
            generated = generated.Insert(
                random.Next(generated.Length),
                uppers[random.Next(uppers.Length - 1)].ToString()
            );

        for (int i = 1; i <= numerics; i++)
            generated = generated.Insert(
                random.Next(generated.Length),
                number[random.Next(number.Length - 1)].ToString()
            );

        return generated.Replace("!", string.Empty);

    }

    要满足上述要求,只需调用以下命令:

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    String randomPassword = GeneratePassword(3, 3, 3);

    代码以一个无效字符("!")开头,这样字符串的长度就可以注入新字符。

    然后,它从1循环到所需的小写字符,在每次迭代中,从小写列表中获取一个随机项,并将其注入字符串中的随机位置。

    然后,它对大写字母和数字重复循环。

    这将返回长度为lowercase + uppercase + numerics的字符串,其中所需计数的小写、大写和数字字符已按随机顺序排列。


    对于这类密码,我倾向于使用一个可能生成更容易"使用"的密码的系统。短,通常由可发音的片段和一些数字组成,没有字符间的歧义(这是0还是O?A 1还是I??)有点像

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    string[] words = { 'bur', 'ler', 'meh', 'ree' };
    string word ="";

    Random rnd = new Random();
    for (i = 0; i < 3; i++)
       word += words[rnd.Next(words.length)]

    int numbCount = rnd.Next(4);
    for (i = 0; i < numbCount; i++)
      word += (2 + rnd.Next(7)).ToString();

    return word;

    (直接在浏览器中键入,因此只能用作指导原则。另外,添加更多单词)。


    我不喜欢membership.generatepassword()创建的密码,因为它们太难看,而且有太多的特殊字符。

    此代码生成一个10位数的密码,不太难看。

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    string password = Guid.NewGuid().ToString("N").ToLower()
                          .Replace("1","").Replace("o","").Replace("0","")
                          .Substring(0,10);

    当然,我可以使用一个regex来做所有的替换,但是这在IMO中更易于阅读和维护。


    我创建了一个使用RNGCryptoServiceProvider的类,它是灵活的。例子:

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    var generator = new PasswordGenerator(minimumLengthPassword: 8,
                                          maximumLengthPassword: 15,
                                          minimumUpperCaseChars: 2,
                                          minimumNumericChars: 3,
                                          minimumSpecialChars: 2);
    string password = generator.Generate();


    我一直对内置的密码生成器Keepass非常满意。由于keepass是一个.NET程序,并且是开源的,所以我决定稍微深入研究一下代码。最后,我引用了keepass.exe(标准应用程序安装中提供的副本),作为我项目中的参考,并编写下面的代码。你可以看到基帕斯有多灵活。您可以指定长度,包括/不包括哪些字符等…

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    using KeePassLib.Cryptography.PasswordGenerator;
    using KeePassLib.Security;


    public static string GeneratePassword(int passwordLength, bool lowerCase, bool upperCase, bool digits,
            bool punctuation, bool brackets, bool specialAscii, bool excludeLookAlike)
        {
            var ps = new ProtectedString();
            var profile = new PwProfile();
            profile.CharSet = new PwCharSet();
            profile.CharSet.Clear();

            if (lowerCase)
                profile.CharSet.AddCharSet('l');
            if(upperCase)
                profile.CharSet.AddCharSet('u');
            if(digits)
                profile.CharSet.AddCharSet('d');
            if (punctuation)
                profile.CharSet.AddCharSet('p');
            if (brackets)
                profile.CharSet.AddCharSet('b');
            if (specialAscii)
                profile.CharSet.AddCharSet('s');

            profile.ExcludeLookAlike = excludeLookAlike;
            profile.Length = (uint)passwordLength;
            profile.NoRepeatingCharacters = true;

            KeePassLib.Cryptography.PasswordGenerator.PwGenerator.Generate(out ps, profile, null, _pool);

            return ps.ReadString();
        }

    我创建了类似于成员资格提供程序中可用的方法。如果您不想在某些应用程序中添加Web引用,那么这非常有用。

    它很好用。

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    public static string GeneratePassword(int Length, int NonAlphaNumericChars)
        {
            string allowedChars ="abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
            string allowedNonAlphaNum ="!@#$%^&*()_-+=[{]};:<>|./?";
            Random rd = new Random();

            if (NonAlphaNumericChars > Length || Length <= 0 || NonAlphaNumericChars < 0)
                throw new ArgumentOutOfRangeException();

                char[] pass = new char[Length];
                int[] pos = new int[Length];
                int i = 0, j = 0, temp = 0;
                bool flag = false;

                //Random the position values of the pos array for the string Pass
                while (i < Length - 1)
                {
                    j = 0;
                    flag = false;
                    temp = rd.Next(0, Length);
                    for (j = 0; j < Length; j++)
                        if (temp == pos[j])
                        {
                            flag = true;
                            j = Length;
                        }

                    if (!flag)
                    {
                        pos[i] = temp;
                        i++;
                    }
                }

                //Random the AlphaNumericChars
                for (i = 0; i < Length - NonAlphaNumericChars; i++)
                    pass[i] = allowedChars[rd.Next(0, allowedChars.Length)];

                //Random the NonAlphaNumericChars
                for (i = Length - NonAlphaNumericChars; i < Length; i++)
                    pass[i] = allowedNonAlphaNum[rd.Next(0, allowedNonAlphaNum.Length)];

                //Set the sorted array values by the pos array for the rigth posistion
                char[] sorted = new char[Length];
                for (i = 0; i < Length; i++)
                    sorted[i] = pass[pos[i]];

                string Pass = new String(sorted);

                return Pass;
        }


    这是我很快整理出来的。

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        public string GeneratePassword(int len)
        {
            string res ="";
            Random rnd = new Random();
            while (res.Length < len) res += (new Func<Random, string>((r) => {
                char c = (char)((r.Next(123) * DateTime.Now.Millisecond % 123));
                return (Char.IsLetterOrDigit(c)) ? c.ToString() :"";
            }))(rnd);
            return res;
        }

    我喜欢看生成密码,就像生成软件密钥一样。您应该从一系列遵循良好实践的字符中进行选择。接受@radu094的回答,并根据良好实践进行修改。不要把每个字母都放在字符数组中。有些信件在电话里很难说清楚。

    您还应该考虑对生成的密码使用校验和,以确保它是由您生成的。实现这一点的一个好方法是使用luhn算法。


    在我的网站上,我使用这种方法:

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        //Symb array
        private const string _SymbolsAll ="~`!@#$%^&*()_+=-\\|[{]}'";:/?.>,<";

        //Random symb
        public string GetSymbol(int Length)
        {
            Random Rand = new Random(DateTime.Now.Millisecond);
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < Length; i++)
                result.Append(_SymbolsAll[Rand.Next(0, _SymbolsAll.Length)]);
            return result.ToString();
        }

    为数组列表编辑字符串_SymbolsAll


    我再加一个不明智的答案。

    我有一个用例,在这个用例中,我需要随机的密码来进行机器通信,所以我对人的可读性没有任何要求。在我的项目中,我也没有访问Membership.GeneratePassword的权限,也不想添加依赖项。

    我很确定Membership.GeneratePassword正在做类似的事情,但是在这里您可以调整要从中提取的字符池。

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    public static class PasswordGenerator
    {
        private readonly static Random _rand = new Random();

        public static string Generate(int length = 24)
        {
            const string lower ="abcdefghijklmnopqrstuvwxyz";
            const string upper ="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            const string number ="1234567890";
            const string special ="!@#$%^&*_-=+";

            // Get cryptographically random sequence of bytes
            var bytes = new byte[length];
            new RNGCryptoServiceProvider().GetBytes(bytes);

            // Build up a string using random bytes and character classes
            var res = new StringBuilder();
            foreach(byte b in bytes)
            {
                // Randomly select a character class for each byte
                switch (_rand.Next(4))
                {
                    // In each case use mod to project byte b to the correct range
                    case 0:
                        res.Append(lower[b % lower.Count()]);
                        break;
                    case 1:
                        res.Append(upper[b % upper.Count()]);
                        break;
                    case 2:
                        res.Append(number[b % number.Count()]);
                        break;
                    case 3:
                        res.Append(special[b % special.Count()]);
                        break;
                }
            }
            return res.ToString();
        }
    }

    以及一些示例输出:

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    PasswordGenerator.Generate(12)
    "pzY=64@-ChS$"
    "BG0OsyLbYnI_"
    "l9#5^2&adj_i"
    "#++Ws9d$%O%X"
    "IWhdIN-#&O^s"

    抢先投诉使用Random:随机性的主要来源仍然是加密RNG。即使你可以确定地预先决定从Random出来的序列(假设它只产生1),你仍然不知道下一个将被选择的字符(尽管这会限制可能性的范围)。

    一个简单的扩展是向不同的字符集添加权重,这可以简单到增加最大值和通过案例添加下降来增加权重。

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    switch (_rand.Next(6))
    {
        // Prefer letters 2:1
        case 0:
        case 1:
            res.Append(lower[b % lower.Count()]);
            break;
        case 2:
        case 3:
            res.Append(upper[b % upper.Count()]);
            break;
        case 4:
            res.Append(number[b % number.Count()]);
            break;
        case 5:
            res.Append(special[b % special.Count()]);
            break;
    }

    对于更人性化的随机密码生成器,我曾经使用eff dice单词列表实现了一个提示系统。


    在已接受的答案中添加了一些补充代码。它改进了只使用随机答案,并允许一些密码选项。我还喜欢keepass答案中的一些选项,但不想在我的解决方案中包含可执行文件。

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    private string RandomPassword(int length, bool includeCharacters, bool includeNumbers, bool includeUppercase, bool includeNonAlphaNumericCharacters, bool includeLookAlikes)
    {
        if (length < 8 || length > 128) throw new ArgumentOutOfRangeException("length");
        if (!includeCharacters && !includeNumbers && !includeNonAlphaNumericCharacters) throw new ArgumentException("RandomPassword-Key arguments all false, no values would be returned");

        string pw ="";
        do
        {
            pw += System.Web.Security.Membership.GeneratePassword(128, 25);
            pw = RemoveCharacters(pw, includeCharacters, includeNumbers, includeUppercase, includeNonAlphaNumericCharacters, includeLookAlikes);
        } while (pw.Length < length);

        return pw.Substring(0, length);
    }

    private string RemoveCharacters(string passwordString, bool includeCharacters, bool includeNumbers, bool includeUppercase, bool includeNonAlphaNumericCharacters, bool includeLookAlikes)
    {
        if (!includeCharacters)
        {
            var remove = new string[] {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z" };
            foreach (string r in remove)
            {
                passwordString = passwordString.Replace(r, string.Empty);
                passwordString = passwordString.Replace(r.ToUpper(), string.Empty);
            }
        }

        if (!includeNumbers)
        {
            var remove = new string[] {"0","1","2","3","4","5","6","7","8","9" };
            foreach (string r in remove)
                passwordString = passwordString.Replace(r, string.Empty);
        }

        if (!includeUppercase)
            passwordString = passwordString.ToLower();

        if (!includeNonAlphaNumericCharacters)
        {
            var remove = new string[] {"!","@","#","$","%","^","&","*","(",")","-","_","+","=","{","}","[","]","|","\",":",";","<",">","/","?","." };
            foreach (string r in remove)
                passwordString = passwordString.Replace(r, string.Empty);
        }

        if (!includeLookAlikes)
        {
            var remove = new string[] {"
    (",")","0","O","o","1","i","I","l","|","!",":",";" };
            foreach (string r in remove)
                passwordString = passwordString.Replace(r, string.Empty);
        }

        return passwordString;
    }

    这是第一个链接,当我搜索生成随机密码,以下是不在当前问题的范围,但可能是重要的考虑。

    • 假设System.Web.Security.Membership.GeneratePassword是加密安全的,至少有20%的字符是非字母数字字符。
    • 在这种情况下,不确定删除字符和附加字符串是否被视为良好的做法,并提供足够的熵。
    • 可能需要考虑以某种方式使用SecureString实现内存中的安全密码存储。


    validchars可以是任何构造,但我决定基于ASCII代码范围选择,删除控制字符。在本例中,它是一个12个字符的字符串。

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    string validChars = String.Join("", Enumerable.Range(33, (126 - 33)).Where(i => !(new int[] { 34, 38, 39, 44, 60, 62, 96 }).Contains(i)).Select(i => { return (char)i; }));
    string.Join("", Enumerable.Range(1, 12).Select(i => { return validChars[(new Random(Guid.NewGuid().GetHashCode())).Next(0, validChars.Length - 1)]; }))

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     Generate random password of specified length with
      - Special characters  
      - Number
      - Lowecase
      - Uppercase

      public static string CreatePassword(int length = 12)
        {
            const string lower ="abcdefghijklmnopqrstuvwxyz";
            const string upper ="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            const string number ="1234567890";
            const string special ="!@#$%^&*";

            var middle = length / 2;
            StringBuilder res = new StringBuilder();
            Random rnd = new Random();
            while (0 < length--)
            {
                if (middle == length)
                {
                    res.Append(number[rnd.Next(number.Length)]);
                }
                else if (middle - 1 == length)
                {
                    res.Append(special[rnd.Next(special.Length)]);
                }
                else
                {
                    if (length % 2 == 0)
                    {
                        res.Append(lower[rnd.Next(lower.Length)]);
                    }
                    else
                    {
                        res.Append(upper[rnd.Next(upper.Length)]);
                    }
                }
            }
            return res.ToString();
        }


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    public static string GeneratePassword(int passLength) {
            var chars ="abcdefghijklmnopqrstuvwxyz@#$&ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            var random = new Random();
            var result = new string(
                Enumerable.Repeat(chars, passLength)
                          .Select(s => s[random.Next(s.Length)])
                          .ToArray());
            return result;
        }


    这个很短,对我很有用。

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    public static string GenerateRandomCode(int length)
    {
        Random rdm = new Random();
        StringBuilder sb = new StringBuilder();

        for(int i = 0; i < length; i++)
            sb.Append(Convert.ToChar(rdm.Next(101,132)));

        return sb.ToString();
    }


    插入计时器:timer1,2个按钮:button1,button2,1个文本框:textbox 1,和一个组合框:combox1。确保您声明:

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    int count = 0;

    源代码:

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     private void button1_Click(object sender, EventArgs e)
        {
        // This clears the textBox, resets the count, and starts the timer
            count = 0;
            textBox1.Clear();
            timer1.Start();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
        // This generates the password, and types it in the textBox
            count += 1;
                string possible ="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
                string psw ="";
                Random rnd = new Random { };
                psw += possible[rnd.Next(possible.Length)];
                textBox1.Text += psw;
                if (count == (comboBox1.SelectedIndex + 1))
                {
                    timer1.Stop();
                }
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            // This adds password lengths to the comboBox to choose from.
            comboBox1.Items.Add("1");
            comboBox1.Items.Add("2");
            comboBox1.Items.Add("3");
            comboBox1.Items.Add("4");
            comboBox1.Items.Add("5");
            comboBox1.Items.Add("6");
            comboBox1.Items.Add("7");
            comboBox1.Items.Add("8");
            comboBox1.Items.Add("9");
            comboBox1.Items.Add("10");
            comboBox1.Items.Add("11");
            comboBox1.Items.Add("12");
        }
        private void button2_click(object sender, EventArgs e)
        {
            // This encrypts the password
            tochar = textBox1.Text;
            textBox1.Clear();
            char[] carray = tochar.ToCharArray();
            for (int i = 0; i < carray.Length; i++)
            {
                int num = Convert.ToInt32(carray[i]) + 10;
                string cvrt = Convert.ToChar(num).ToString();
                textBox1.Text += cvrt;
            }
        }


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    public string Sifre_Uret(int boy, int noalfa)
    {

        //  01.03.2016  
        // Genel ama?l? ?ifre üretme fonksiyonu


        //Fonskiyon 128 den büyük olmas?na izin vermiyor.
        if (boy > 128 ) { boy = 128; }
        if (noalfa > 128) { noalfa = 128; }
        if (noalfa > boy) { noalfa = boy; }


        string passch = System.Web.Security.Membership.GeneratePassword(boy, noalfa);

        //URL encoding ve Url Pass + json sorunu yaratabilecekler pass ediliyor.
        //Microsoft Garanti etmiyor. Alfa Say?sallar Olabiliyorimi? . !@#$%^&*()_-+=[{]};:<>|./?.
        //https://msdn.microsoft.com/tr-tr/library/system.web.security.membership.generatepassword(v=vs.110).aspx


        //URL ve Json ajax lar i?in filtreleme
        passch = passch.Replace(":","z");
        passch = passch.Replace(";","W");
        passch = passch.Replace("'","t");
        passch = passch.Replace(""","r");
        passch = passch.Replace("
    /","+");
        passch = passch.Replace("
    \","e");

        passch = passch.Replace("
    ?","9");
        passch = passch.Replace("
    &","8");
        passch = passch.Replace("
    #","D");
        passch = passch.Replace("%","u");
        passch = passch.Replace("=","4");
        passch = passch.Replace("~","1");

        passch = passch.Replace("[","2");
        passch = passch.Replace("]","3");
        passch = passch.Replace("{","g");
        passch = passch.Replace("}","J");


        //passch = passch.Replace("(","6");
        //passch = passch.Replace(")","0");
        //passch = passch.Replace("|","p");
        //passch = passch.Replace("@","4");
        //passch = passch.Replace("!","u");
        //passch = passch.Replace("$","Z");
        //passch = passch.Replace("*","5");
        //passch = passch.Replace("_","a");

        passch = passch.Replace(",","V");
        passch = passch.Replace(".","N");
        passch = passch.Replace("+","w");
        passch = passch.Replace("-","7");





        return passch;



    }