- #RANDOM PASSWORD GENERATOR MICROSOFT 64 BIT#
- #RANDOM PASSWORD GENERATOR MICROSOFT FULL#
- #RANDOM PASSWORD GENERATOR MICROSOFT CODE#
/ alpha-numeric character it will not start with a special symbol (we do / character, one upper case character, one number, and one special symbol Every four characters will include one lower case / This class can generate random passwords, which do not include ambiguous WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
#RANDOM PASSWORD GENERATOR MICROSOFT CODE#
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, Application template and replace the contents of the Class1.cs file with
To run this sample, create a new Visual C# project using the Console rules and does not contain ambiguous characters. SAMPLE: Generates random password, which complies with the strong password This is a lot larger, but I think it looks a little more comprehensive: Using base-64 guarantees a widely-compatible set of characters, and the characteristics of such a string shouldn't make it any less secure as long as you use a decent hashing algorithm. Using Unicode, for example, tends to give a lot of Chinese characters.
#RANDOM PASSWORD GENERATOR MICROSOFT FULL#
(tokenBuffer) - just make sure you pick a character set that can represent the full range of values coming out of the RNG, and that produces characters that are compatible with wherever you're sending or storing this. If you don't like using base-64 strings for any reason, you can replace the Convert.ToBase64String() call with either a conversion to regular string, or with any of the Encoding methods eg. However, because base-64 uses a 4-character block to encode each 3 bytes of input, if you ask for a length that's not a multiple of 3, there will be some extra "space", and it'll use = to fill the extra. This controls how many bytes of entropy the password will have. The length parameter specifies the length of the byte buffer, not the output string (and is therefore perhaps not the best name for that parameter, now I think about it). It's been noted that as this returns a base-64 string, the output length is always a multiple of 4, with the extra space using = as a padding character.
(You could also have the class where this method lives implement IDisposable, hold a reference to the RNGCryptoServiceProvider, and dispose of it properly, to avoid repeatedly instantiating it.) Return Convert.ToBase64String(tokenBuffer) Using (RNGCryptoServiceProvider cryptRNG = new RNGCryptoServiceProvider()) (This is a copy of my answer to How can I generate random 8 character, alphanumeric strings in C#?) Ulong value = BitConverter.ToUInt64(bytes, i * 8) New RNGCryptoServiceProvider().GetBytes(bytes) Throw new ArgumentException("characterSet must not be empty", "characterSet") Var characterArray = characterSet.Distinct().ToArray() Throw new ArgumentNullException("characterSet") Throw new ArgumentException("length is too big", "length") If (length int.MaxValue / 8) // 250 million chars ought to be enough for anybody Public static string GetRandomString(int length, IEnumerable characterSet) Return GetRandomString(length, alphanumericCharacters) Public static string GetRandomAlphanumericString(int length) The second and third property are achieved by using RNGCryptoServiceProvider instead of System.Random. For small alphabets (such as the 62 characters from the question) this leads to negligible bias.
#RANDOM PASSWORD GENERATOR MICROSOFT 64 BIT#
The first property is achieved by taking a 64 bit value modulo the alphabet size. It's secure, since I expect people to use this for passwords or other security tokens.Generating an 8 character string (~47 bits of entropy) is meaningless if your PRNG only generates 2 billion (31 bits of entropy) different values. It outputs more than a few billion strings for each argument set.The distribution of strings is almost uniform (don't care about minor deviations, as long as they're small).If the password check failed, you would have to re-generate it. You may check if the password meets at least 3 requirements of the “ Password must meet complexity requirements” policy (the password must contain at least 3 types of characters from the following list: numbers, lower-case characters, UPPER-case characters, and special characters). Of course, it does not make sense to check its length and the presence of username in a password. Prior to setting a password to a user, you can make sure that it complies with the password complexity policy. If your company is using a strong password policy, in some cases a password generated with the GeneratePassword method may not meet the requirements of your AD domain password policy. Also, you can use the GeneratePassword method to reset Active Directory user passwords.
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