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Thread: Password Strength Meter

  1. #1
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    Smile Password Strength Meter

    Hi to all!

    I am a beginner Java programmer. i would like to seek help on how to create a password strength meter.. the conditions are the following:

    1. must have atleast 7 characters.
    2. must contain atleast 1 number.
    3. must contain atleast 1 small letter.
    4. must contain atleast 1 capital letter.
    5. must contain atleast 1 symbol.

    thank you very much.

    Dr.Kernel


  2. #2
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    Default Re: Password Strength Meter

    What have you tried?
    Improving the world one idiot at a time!

  3. #3
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    Default Re: Password Strength Meter

    none yet.. but i found this code i dont know if this will work..

    pw_strenth.js
    // Settings
    // -- Toggle to true or false, if you want to change what is checked in the password
    var bCheckNumbers = true;
    var bCheckUpperCase = true;
    var bCheckLowerCase = true;
    var bCheckPunctuation = true;
    var nPasswordLifetime = 365;
     
    // Check password
    function checkPassword(strPassword)
    {
            // Reset combination count
            nCombinations = 0;
     
            // Check numbers
            if (bCheckNumbers)
            {
                    strCheck = "0123456789";
                    if (doesContain(strPassword, strCheck) > 0)
                    {
                            nCombinations += strCheck.length;
                    }
            }
     
            // Check upper case
            if (bCheckUpperCase)
            {
                    strCheck = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                    if (doesContain(strPassword, strCheck) > 0)
                    {
                            nCombinations += strCheck.length;
                    }
            }
     
            // Check lower case
            if (bCheckLowerCase)
            {
                    strCheck = "abcdefghijklmnopqrstuvwxyz";
                    if (doesContain(strPassword, strCheck) > 0)
                    {
                            nCombinations += strCheck.length;
                    }
            }
     
            // Check punctuation
            if (bCheckPunctuation)
            {
                    strCheck = ";:-_=+|//?^&!.@$#*()%~<>{}[]";
                    if (doesContain(strPassword, strCheck) > 0)
                    {
                            nCombinations += strCheck.length;
                    }
            }
     
            // Calculate
            // -- 500 tries per second => minutes
            var nDays = ((Math.pow(nCombinations, strPassword.length) / 500) / 2) / 86400;
     
            // Number of days out of password lifetime setting
            var nPerc = nDays / nPasswordLifetime;
     
            return nPerc;
    }
     
    // Runs password through check and then updates GUI
    function runPassword(strPassword, strFieldID)
    {
            // Check password
            nPerc = checkPassword(strPassword);
     
             // Get controls
            var ctlBar = document.getElementById(strFieldID + "_bar");
            var ctlText = document.getElementById(strFieldID + "_text");
            if (!ctlBar || !ctlText)
                    return;
     
            // Set new width
            var nRound = Math.round(nPerc * 100);
            if (nRound < (strPassword.length * 5))
            {
                    nRound += strPassword.length * 5;
            }
            if (nRound > 100)
                    nRound = 100;
            ctlBar.style.width = nRound + "%";
     
            // Color and text
            if (nRound > 95)
            {
                    strText = "Very Secure";
                    strColor = "#3bce08";
            }
            else if (nRound > 75)
            {
                    strText = "Secure";
                    strColor = "orange";
            }
            else if (nRound > 50)
            {
                    strText = "Mediocre";
                    strColor = "#ffd801";
            }
            else
            {
                    strColor = "red";
                    strText = "Insecure";
            }
            ctlBar.style.backgroundColor = strColor;
            ctlText.innerHTML = "<span style='color: " + strColor + ";'>" + strText + "</span>";
    }
     
    // Checks a string for a list of characters
    function doesContain(strPassword, strCheck)
     {
            nCount = 0;
     
            for (i = 0; i < strPassword.length; i++)
            {
                    if (strCheck.indexOf(strPassword.charAt(i)) > -1)
                    {
                            nCount++;
                    }
            }
     
            return nCount;
    }
    Last edited by helloworld922; November 4th, 2011 at 01:24 AM.

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    Default Re: Password Strength Meter

    Ah yes, why bother writing our own code and learning when you can simply steal it from someone else?
    Improving the world one idiot at a time!

  5. #5
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    Default Re: Password Strength Meter

    im not stealing it, im trying to analyze how he/she codes it.. just using it as my reference.

  6. #6
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    Default Re: Password Strength Meter

    You can achieve this by implementing a test for each of the 5 conditions.
    if password fails test 1
        return false
    if password fails test 2
        return false
    if password fails test 3
        return false
    if password fails test 4
        return false
    if password fails test 5
        return false
    return true // must have passed
    Surely test 1 is simple. How do you test if a String has 7 characters? On the other hand, if you are keen you can use a regular expression.
    Improving the world one idiot at a time!

  7. #7
    Think of me.... Mr.777's Avatar
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    Default Re: Password Strength Meter

    Quote Originally Posted by Junky View Post
    You can achieve this by implementing a test for each of the 5 conditions.
    if password fails test 1
        return false
    if password fails test 2
        return false
    if password fails test 3
        return false
    if password fails test 4
        return false
    if password fails test 5
        return false
    return true // must have passed
    Surely test 1 is simple. How do you test if a String has 7 characters? On the other hand, if you are keen you can use a regular expression.
    Adding to the Junky suggestion/comment, you can similarly test all five tests to achieve what you want to.
    Hint is compare ASCII values.

  8. #8
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    Default Re: Password Strength Meter

    Quote Originally Posted by Dr.Kernel
    none yet.. but i found this code i dont know if this will work..
    java != javascript. Do you wish to implement this in java, or javascript (these are java forums)

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