Package com.marcosavard.commons.security

Class Password

java.lang.Object

com.marcosavard.commons.security.Password

public class Password
extends java.lang.Object

A class that computes password entropy.

Author:

Marco

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Password.Strenght

Constructor Summary

Constructors

Constructor	Description
Password()

Method Summary

Modifier and Type	Method	Description
static int	computeEntropy(char[] password)	Compute entropy based on number of bits.
static Password.Strenght	getStrenght(int entropy)	Returns the password's strength, based on its entropy.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Password

public Password()

Method Detail

computeEntropy

public static int computeEntropy(char[] password)

Compute entropy based on number of bits. The entropy formula is purely mathematically and words found in a dictionary are not taken in amount by the method. See https://softwareengineering.stackexchange.com/questions/167235/how-can-i-estimate-the-entropy-of-a-password

Parameters:

password - as array of characters, for security reasons.

Returns:

the number of bits of entropy, usually between 5 and 50 bits.

getStrenght

public static Password.Strenght getStrenght(int entropy)

Returns the password's strength, based on its entropy.

Parameters:

entropy - the number of bits of entropy

Returns:

its strength, form VERY_WEAK to VERY_STRONG