GenerateParameterDefault Class

Definition

public sealed class GenerateParameterDefault : Aspire.Hosting.ApplicationModel.ParameterDefault

type GenerateParameterDefault = class
    inherit ParameterDefault

Public NotInheritable Class GenerateParameterDefault
Inherits ParameterDefault

Inheritance

Object

ParameterDefault

GenerateParameterDefault

Remarks

The recommended minimum bits of entropy for a generated password is 128 bits.

The general calculation of bits of entropy is:

log base 2 (numberPossibleOutputs)

This generator uses 23 upper case, 23 lower case (excludes i,l,o,I,L,O to prevent confusion), 10 numeric, and 11 special characters. So a total of 67 possible characters.

When all character sets are enabled, the number of possible outputs is (67 ^ length). The minimum password length for 128 bits of entropy is 22 characters: log base 2 (67 ^ 22).

When character sets are disabled, it lowers the number of possible outputs and thus the bits of entropy.

Using MinLower, MinUpper, MinNumeric, and MinSpecial also lowers the number of possible outputs and thus the bits of entropy.

A generalized lower-bound formula for the number of possible outputs is to consider a string of the form:

{nonRequiredCharacters}{requiredCharacters}

let a = MinLower, b = MinUpper, c = MinNumeric, d = MinSpecial
let x = length - (a + b + c + d)

nonRequiredPossibilities = 67^x
requiredPossibilities = 23^a * 23^b * 10^c * 11^d * (a + b + c + d)! / (a! * b! * c! * d!)

lower-bound of total possibilities = nonRequiredPossibilities * requiredPossibilities

Putting it all together, the lower-bound bits of entropy calculation is:

log base 2 [67^x * 23^a * 23^b * 10^c * 11^d * (a + b + c + d)! / (a! * b! * c! * d!)]

Constructors

Properties

Methods

Applies to