当我们网站上的用户丢失密码并前往“丢失密码”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，我想做的就是给他们一个密码，他们以后可以更改。
该应用程序是用 C# 编写的 Web 应用程序。所以我想变得刻薄，并采用简单的方法来使用 Guid 的一部分。IE
Guid.NewGuid().ToString("d").Substring(1,8)
建议？想法？
FryHard
问问题
281019 次
27 回答
643
总是有System.Web.Security.Membership.GeneratePassword(int length, int numberOfNonAlphanumericCharacters）。
于 2008-09-10T22:44:45.250 回答
130
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();
}
这样做的好处是可以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）
于 2008-09-10T18:47:55.103 回答
44
我的代码的主要目标是：
- 字符串的分布几乎是均匀的（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几十亿个字符串。如果您的 PRNG 只生成 20 亿（31 位熵）不同的值，那么生成 8 个字符串（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。
第一个属性是通过以字母大小为模取一个 64 位值来实现的。对于小字母（例如问题中的 62 个字符），这会导致可忽略的偏差。第二个和第三个属性是通过使用RNGCryptoServiceProvider代替来实现的System.Random。
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？ ）
于 2013-09-28T14:42:15.977 回答
32
public string GenerateToken(int length)
{
using (RNGCryptoServiceProvider cryptRNG = new RNGCryptoServiceProvider())
{
byte[] tokenBuffer = new byte[length];
cryptRNG.GetBytes(tokenBuffer);
return Convert.ToBase64String(tokenBuffer);
}
}
（你也可以让这个方法所在的类实现 IDisposable，持有对 的引用RNGCryptoServiceProvider，并正确处理它，以避免重复实例化它。）
值得注意的是，由于这会返回一个 base-64 字符串，因此输出长度始终是 4 的倍数，额外的空格=用作填充字符。该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）。这控制密码将具有多少字节的熵。但是，因为 base-64 使用 4 字符块来编码每 3 个字节的输入，如果您要求的长度不是 3 的倍数，将会有一些额外的“空间”，它会=用来填充额外的。
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任何Encoding方法；例如。Encoding.UTF8.GetString(tokenBuffer)- 只需确保您选择的字符集可以代表来自 RNG 的全部值范围，并且生成的字符与您发送或存储的任何地方都兼容。例如，使用 Unicode 往往会给出很多汉字。使用 base-64 保证了广泛兼容的字符集，并且只要您使用体面的散列算法，这样的字符串的特性就不会降低它的安全性。
于 2014-07-12T09:24:08.800 回答
22
这要大得多，但我认为它看起来更全面： http ://www.obviex.com/Samples/Password.aspx
///////////////////////////////////////////////////////////////////////////////
// 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
///////////////////////////////////////////////////////////////////////////////
于 2008-09-10T18:47:24.370 回答
8
我知道这是一个旧线程，但我有可能是一个相当简单的解决方案供某人使用。易于实施、易于理解和易于验证。
考虑以下要求：
我需要生成一个随机密码，其中至少有 2 个小写字母、2 个大写字母和 2 个数字。密码的长度也必须至少为 8 个字符。
以下正则表达式可以验证这种情况：
^(?=\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,}$
它超出了这个问题的范围 - 但正则表达式基于lookahead/lookbehind和lookaround。
以下代码将创建一组符合此要求的随机字符：
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：
String randomPassword = GeneratePassword(3, 3, 3);
代码以无效字符 ( "!") 开头 - 以便字符串具有可以注入新字符的长度。
然后它从 1 循环到所需的 # 个小写字符，并且在每次迭代中，从小写列表中抓取一个随机项，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。
这将为您返回长度 = 的字符串，lowercase + uppercase + numerics其中您想要的计数的小写、大写和数字字符已按随机顺序放置。
于 2013-01-11T21:57:49.087 回答
8
我创建了这个使用 RNGCryptoServiceProvider 的类，它很灵活。例子：
var generator = new PasswordGenerator(minimumLengthPassword: 8,
maximumLengthPassword: 15,
minimumUpperCaseChars: 2,
minimumNumericChars: 3,
minimumSpecialChars: 2);
string password = generator.Generate();
于 2014-05-31T19:02:59.297 回答
7
我将在锅中添加另一个不明智的答案。
我有一个用例，我需要随机密码进行机机通信，所以我对人类可读性没有任何要求。我也无权访问Membership.GeneratePassword我的项目，也不想添加依赖项。
我相当肯定Membership.GeneratePassword正在做类似的事情，但在这里你可以调整要从中提取的字符池。
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 = "!@#$%^&*_-=+";
// Get cryptographically random sequence of bytes
var bytes = new byte[length];
new RNGCryptoServiceProvider().GetBytes(bytes);
// Build up a string using random bytes and character classes
var res = new StringBuilder();
foreach(byte b in bytes)
{
// Randomly select a character class for each byte
switch (_rand.Next(4))
{
// In each case use mod to project byte b to the correct range
case 0:
res.Append(lower[b % lower.Count()]);
break;
case 1:
res.Append(upper[b % upper.Count()]);
break;
case 2:
res.Append(number[b % number.Count()]);
break;
case 3:
res.Append(special[b % special.Count()]);
break;
}
}
return res.ToString();
}
}
还有一些示例输出：
PasswordGenerator.Generate(12)
"pzY=64@-ChS$"
"BG0OsyLbYnI_"
"l9#5^2&adj_i"
"#++Ws9d$%O%X"
"IWhdIN-#&O^s"
抢先抱怨使用Random: 随机性的主要来源仍然是加密 RNG。即使您可以确定性地预先确定来自的序列Random（比如说它只产生1），您仍然不会知道将选择的下一个字符（尽管这会限制可能性的范围）。
一个简单的扩展是为不同的字符集添加权重，这可以像增加最大值并添加失败案例以增加权重一样简单。
switch (_rand.Next(6))
{
// Prefer letters 2:1
case 0:
case 1:
res.Append(lower[b % lower.Count()]);
break;
case 2:
case 3:
res.Append(upper[b % upper.Count()]);
break;
case 4:
res.Append(number[b % number.Count()]);
break;
case 5:
res.Append(special[b % special.Count()]);
break;
}
为了更人性化的随机密码生成器，我曾经使用EFF dice-word list实现了一个提示系统。
于 2019-03-12T21:18:52.427 回答
6
对于这种密码，我倾向于使用可能生成更容易“使用”密码的系统。简短，通常由可发音的片段和一些数字组成，并且没有字符间的歧义（是 0 还是 O？A 1 还是 I？）。就像是
string[] words = { 'bur', 'ler', 'meh', 'ree' };
string word = "";
Random rnd = new Random();
for (i = 0; i < 3; i++)
word += words[rnd.Next(words.length)]
int numbCount = rnd.Next(4);
for (i = 0; i < numbCount; i++)
word += (2 + rnd.Next(7)).ToString();
return word;
（直接在浏览器中输入，因此仅用作指南。另外，添加更多单词）。
于 2008-09-10T18:53:56.540 回答
6
我不喜欢 Membership.GeneratePassword() 创建的密码，因为它们太难看并且有太多特殊字符。
此代码生成一个 10 位不太难看的密码。
string password = Guid.NewGuid().ToString("N").ToLower()
.Replace("1", "").Replace("o", "").Replace("0","")
.Substring(0,10);
当然，我可以使用正则表达式进行所有替换，但这更具可读性和可维护性 IMO。
于 2011-01-21T10:09:57.707 回答
3
我创建了这个方法，类似于会员提供程序中的可用方法。如果您不想在某些应用程序中添加 Web 引用，这很有用。
它工作得很好。
public static string GeneratePassword(int Length, int NonAlphaNumericChars)
{
string allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
string allowedNonAlphaNum = "!@#$%^&*()_-+=[{]};:<>|./?";
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;
}
于 2012-05-15T12:00:03.120 回答
3
我一直对 KeePass 内置的密码生成器非常满意。由于 KeePass 是一个 .Net 程序并且是开源的，所以我决定深入研究一下代码。我最终只是引用了标准应用程序安装中提供的副本 KeePass.exe，作为我项目中的参考，并编写了下面的代码。借助 KeePass，您可以看到它的灵活性。您可以指定长度、要包含/不包含的字符等...
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();
}
于 2015-06-14T15:02:55.167 回答
1
我喜欢看生成密码，就像生成软件密钥一样。您应该从遵循良好实践的字符数组中进行选择。采用@Radu094 的回答并修改它以遵循良好的做法。不要将每个字母都放在字符数组中。有些信件在电话里很难说或理解。
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。实现此目的的一个好方法是使用LUHN 算法。
于 2008-09-10T18:54:37.550 回答
1
public static string GeneratePassword(int passLength) {
var chars = "abcdefghijklmnopqrstuvwxyz@#$&ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
var random = new Random();
var result = new string(
Enumerable.Repeat(chars, passLength)
.Select(s => s[random.Next(s.Length)])
.ToArray());
return result;
}
于 2018-06-25T12:16:27.767 回答
1
这个包允许您生成一个随机密码，同时流畅地指示它应该包含哪些字符（如果需要）：
https://github.com/prjseal/PasswordGenerator/
例子：
var pwd = new Password().IncludeLowercase().IncludeUppercase().IncludeSpecial();
var password = pwd.Next();
于 2020-01-27T14:24:25.413 回答
0
在我的网站上，我使用这种方法：
//Symb array
private const string _SymbolsAll = "~`!@#$%^&*()_+=-\\|[{]}'\";:/?.>,<";
//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();
}
编辑数组列表的字符串_SymbolsAll。
于 2015-03-29T21:05:59.450 回答
0
这是我快速整理的内容。
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;
}
于 2015-12-03T08:10:42.467 回答
0
在接受的答案中添加了一些补充代码。它仅使用 Random 改进了答案，并允许一些密码选项。我也喜欢 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。
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;
}
这是我搜索生成随机密码时的第一个链接，以下内容超出了当前问题的范围，但可能需要考虑。
- 基于
System.Web.Security.Membership.GeneratePassword加密安全的假设，至少 20% 的字符是非字母数字的。 - 不确定在这种情况下删除字符和附加字符串是否被认为是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。
于 2017-01-03T17:55:43.407 回答
0
validChars 可以是任何构造，但我决定根据删除控制字符的 ascii 代码范围进行选择。在本例中，它是一个 12 个字符的字符串。
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)]; }))
于 2017-10-03T18:11:39.383 回答
0
如果您想利用 System.Web.Security.Membership.GeneratePassword 使用的加密安全随机数生成，但又想将字符集限制为字母数字字符，则可以使用正则表达式过滤结果：
static string GeneratePassword(int characterCount)
{
string password = String.Empty;
while(password.Length < characterCount)
password += Regex.Replace(System.Web.Security.Membership.GeneratePassword(128, 0), "[^a-zA-Z0-9]", string.Empty);
return password.Substring(0, characterCount);
}
于 2020-02-24T19:02:09.880 回答
0
检查此代码...我添加了 .remove(length) 以改善anaximander的响应
public string GeneratePassword(int length)
{
using(RNGCryptoServiceProvider cryptRNG = new RNGCryptoServiceProvider();)
{
byte[] tokenBuffer = new byte[length];
cryptRNG.GetBytes(tokenBuffer);
return Convert.ToBase64String(tokenBuffer).Remove(length);
}
}
于 2021-02-23T13:48:13.983 回答
0
如何在 C# 中生成随机密码。
输出：（https://prnt.sc/11fac8v）
运行：https ://onlinegdb.com/HJe5OHBLu
using System;
using System.Linq;
public class Program
{
private static Random random = new Random();
public static void Main()
{
Console.WriteLine("Random password with length of 8 character.");
Console.WriteLine("===========================================");
Console.WriteLine("Capital latters : 2");
Console.WriteLine("Number latters : 2");
Console.WriteLine("Special latters : 2");
Console.WriteLine("Small latters : 2");
Console.WriteLine("===========================================");
Console.Write("The Random Password : ");
Console.WriteLine(RandomStringCap(2) + RandomStringNum(2) + RandomStringSpe(2) + RandomStringSml(2));
Console.WriteLine("===========================================");
}
public static string RandomStringCap(int length)
{
const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
return new string(Enumerable.Repeat(chars, length)
.Select(s => s[random.Next(s.Length)]).ToArray());
}
public static string RandomStringNum(int length)
{
const string chars = "0123456789";
return new string(Enumerable.Repeat(chars, length)
.Select(s => s[random.Next(s.Length)]).ToArray());
}
public static string RandomStringSml(int length)
{
const string chars = "abcdefghijklmnopqrstuvwxyz";
return new string(Enumerable.Repeat(chars, length)
.Select(s => s[random.Next(s.Length)]).ToArray());
}
public static string RandomStringSpe(int length)
{
const string chars = "!@#$%^&*_-=+";
return new string(Enumerable.Repeat(chars, length)
.Select(s => s[random.Next(s.Length)]).ToArray());
}
}
于 2021-04-15T05:01:55.427 回答
-1
这很短，对我很有用。
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();
}
于 2013-10-27T00:59:56.977 回答
-1
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 = "!@#$%^&*";
var middle = length / 2;
StringBuilder res = new StringBuilder();
Random rnd = new Random();
while (0 < length--)
{
if (middle == length)
{
res.Append(number[rnd.Next(number.Length)]);
}
else if (middle - 1 == length)
{
res.Append(special[rnd.Next(special.Length)]);
}
else
{
if (length % 2 == 0)
{
res.Append(lower[rnd.Next(lower.Length)]);
}
else
{
res.Append(upper[rnd.Next(upper.Length)]);
}
}
}
return res.ToString();
}
于 2018-02-09T08:38:53.020 回答
-1
我使用此代码生成具有字母、数字和 non_alpha_numeric 字符的平衡组成的密码。
public static string GeneratePassword(int Length, int NonAlphaNumericChars)
{
string allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
string allowedNonAlphaNum = "!@#$%^&*()_-+=[{]};:<>|./?";
string pass = "";
Random rd = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < Length; i++)
{
if (rd.Next(1) > 0 && NonAlphaNumericChars > 0)
{
pass += allowedNonAlphaNum[rd.Next(allowedNonAlphaNum.Length)];
NonAlphaNumericChars--;
}
else
{
pass += allowedChars[rd.Next(allowedChars.Length)];
}
}
return pass;
}
于 2019-08-02T17:48:35.630 回答
-4
public string Sifre_Uret(int boy, int noalfa)
{
// 01.03.2016
// Genel amaçlı şifre üretme fonksiyonu
//Fonskiyon 128 den büyük olmasına 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 Sayısallar Olabiliyorimiş . !@#$%^&*()_-+=[{]};:<>|./?.
//https://msdn.microsoft.com/tr-tr/library/system.web.security.membership.generatepassword(v=vs.110).aspx
//URL ve Json ajax lar için filtreleme
passch = passch.Replace(":", "z");
passch = passch.Replace(";", "W");
passch = passch.Replace("'", "t");
passch = passch.Replace("\"", "r");
passch = passch.Replace("/", "+");
passch = passch.Replace("\\", "e");
passch = passch.Replace("?", "9");
passch = passch.Replace("&", "8");
passch = passch.Replace("#", "D");
passch = passch.Replace("%", "u");
passch = passch.Replace("=", "4");
passch = passch.Replace("~", "1");
passch = passch.Replace("[", "2");
passch = passch.Replace("]", "3");
passch = passch.Replace("{", "g");
passch = passch.Replace("}", "J");
//passch = passch.Replace("(", "6");
//passch = passch.Replace(")", "0");
//passch = passch.Replace("|", "p");
//passch = passch.Replace("@", "4");
//passch = passch.Replace("!", "u");
//passch = passch.Replace("$", "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;
}
于 2016-03-01T12:04:49.417 回答
-5
插入一个计时器：timer1、2 个按钮：button1、button2、1 个文本框：textBox1 和一个组合框：comboBox1。确保您声明：
int count = 0;
源代码：
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;
}
}
于 2013-09-28T14:03:33.880 回答