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Thread: password

  1. #1
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    Default password

    i want to write a code to generat passwords but, a random generator method inside it not changing its value, can i get a solution to this d analternative way to generate password using matric number of the form s60202003

    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
     
    package key;
     
    /**
     *
     * @author HARLEY
     */
    import java.io.*;
    import java.util.*;
    public class Main {
        public static void main(String[] args) throws IOException {
            File inputFile = new File("cc.txt");
     
            File outputFile = new File("cico.txt");
     
            BufferedReader in = new BufferedReader(new FileReader(inputFile));
     
            BufferedWriter out = new BufferedWriter(new FileWriter(outputFile));
     
            String line;
            int jack = 60 ;
            int adme = 1;
            while ((line = in.readLine())!= null) {
     
                //int num = line.hashCode();
                //int namei = Integer.parseInt(line.substring(7));
                Random rand = new Random(100);
                int numt = rand.nextInt(50);
     
                if (line.length()>3) {
     
     
                    adme += 1;
                    Formatter formato = new Formatter();
                int sys = Integer.parseInt(line.substring(7));
                sys = 64 +sys;
               // namei = jack + namei;
                //int js = line.substring(6);
               char form = (char) (sys);
               String hnome = (formato.format("%c",sys).toString());
               String nam = hnome.toLowerCase();
     
                //String suname = name.substring(2);
                //char col = line.charAt(3);
                //int num = line.hashCode();
                //int nnum = Math.abs(num); 
                /**
                Formatter formato = new Formatter();
                String hnome = (formato.format("%d",jack).toString());
                String hname = hnome.substring(0,2);
                String hname2 = hnome.substring(3,5);
                int nonam = line.length();
                String namea = line.substring(0,1);
                out.write(hname+hnome);
                */
               System.out.println(nam+adme+numt);
              out.write("");
              out.newLine();
                }
                   }
            in.close();
            out.close();
        }
    }


  2. #2
    Member Truffy's Avatar
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    Default Re: password

    Hi 5723,

    Welcome to the Java Programming Forums.

    Please refer to the below thread. You can get an idea on it.
    http://www.javaprogrammingforums.com...-password.html


    Cheers,
    Truffy

  3. #3
    mmm.. coffee JavaPF's Avatar
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    Default Re: password

    Hey 5723.

    What is cc.txt used for?
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  4. #4
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    Default Re: password

    i used the cc.txt as my input file, the password is meant to be generated for matric numbers which is saved in cc.txt and the output be printted to cico.txt

  5. #5
    mmm.. coffee JavaPF's Avatar
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    Default Re: password

    Can you give me an example of some 'matric' numbers?

    Also, what kind of output are you looking for? Can you give me an example generated password..
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  6. #6
    mmm.. coffee JavaPF's Avatar
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    Default Re: password

    Not sure if this is correct. Let me know..

    Example input (cc.txt):

    s60202403
    d60202501
    f60202702
    g60202904
    h60202005
    Example output (cico.txt);

    c215
    a315
    b415
    d515
    e615
    import java.io.*;
    import java.util.*;
     
    public class Main {
     
        public static String newLine = System.getProperty("line.separator");
     
        public static void main(String[] args) throws IOException {
     
            File inputFile = new File("cc.txt");
            File outputFile = new File("cico.txt");
     
            BufferedReader in = new BufferedReader(new FileReader(inputFile));
            BufferedWriter out = new BufferedWriter(new FileWriter(outputFile));
     
            String line;
            int jack = 60;
            int adme = 1;
     
            while ((line = in.readLine()) != null) {
     
                // int num = line.hashCode();
                // int namei = Integer.parseInt(line.substring(7));
                Random rand = new Random(100);
                int numt = rand.nextInt(50);
     
                if (line.length() > 3) {
     
                    adme += 1;
                    Formatter formato = new Formatter();
                    int sys = Integer.parseInt(line.substring(7));
                    sys = 64 + sys;
                    // namei = jack + namei;
                    // int js = line.substring(6);
                    char form = (char) (sys);
                    String hnome = (formato.format("%c", sys).toString());
                    String nam = hnome.toLowerCase();
     
                    // String suname = name.substring(2);
                    // char col = line.charAt(3);
                    // int num = line.hashCode();
                    // int nnum = Math.abs(num);
                    /**
                     * Formatter formato = new Formatter(); String hnome =
                     * (formato.format("%d",jack).toString()); String hname =
                     * hnome.substring(0,2); String hname2 = hnome.substring(3,5);
                     * int nonam = line.length(); String namea =
                     * line.substring(0,1); out.write(hname+hnome);
                     */
                    String pass = nam + adme + numt;
                    System.out.println(pass);
     
                    out.write(pass);
                    out.write(newLine);
                }
            }
            in.close();
            out.close();
        }
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  7. The Following User Says Thank You to JavaPF For This Useful Post:

    5723 (July 1st, 2009)

  8. #7
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    Default Re: password

    all matric numbers start with s and its length is 9, but i want a more random password generator, thanks.

  9. #8
    Senile Half-Wit Freaky Chris's Avatar
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    Default Re: password

    I'm having trouble understanding what exactly you are after, that might just be me because I'm simple. However I would really appreciate it if you could exaplain the problem clearly, post any sample input, explain the process to taken to get to the output. And post any output examples (disered output that is) so that I can have a good look for you.

    Thanks,
    Chris
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales

  10. #9
    Super Moderator Json's Avatar
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    Default Re: password

    I'm currently working on a little password generation class with built in password strength checker. I will post it here once it is done. Probably tomorrow.

    // Json

  11. #10
    Super Moderator Json's Avatar
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    Lightbulb Re: password

    I believe I've finished my password generator and here we go.

    To test it out
        public static void main(final String... arguments) {
            final char[] password = Password.generate(8);
     
            System.out.println("Password: " + String.valueOf(password));
            System.out.println("Strength: " + Password.strength(String.valueOf(password)) + "%");
        }

    This should print out the password and the strength of it.


    Password.java
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Random;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
     
    /**
     * Password generator created for the members of Java Programming Forums. Feel free
     * to use this in your own applications. Please give credit where credit is due.
     *
     * @author Daniel Johansson
     * @since 9 Jul 2009
     */
    public class Password {
     
        private static final String ALPHA_CHARACTERS = "abcdefghijklmnopqrstuvwxyz";
     
        private static final String NUMBERS = "0123456789";
     
        private static final String SYMBOLS = "$%&*@#!_:~";
     
        /**
         * Since this is a utility class there is no need to instantiate it. All statics baby!
         */
        protected Password() {
            throw new UnsupportedOperationException();
        }
     
        /**
         * Generates a random password of the specified length using uppercase letters, lowercase letters, digits and symbols.
         *
         * @param length the length of the password.
         * @return character array representing the password
         */
        public static char[] generate(final int length) {
            final String allowedCharaters = ALPHA_CHARACTERS + NUMBERS + SYMBOLS;
            final Random random = new Random();
            final char[] password = new char[length];
     
            for (int i = 0; i < length; ++i) {
                password[i] = allowedCharaters.charAt(random.nextInt(allowedCharaters.length() - 1));
            }
     
            return password;
        }
     
        /**
         * Calculates the strength of the password based on certain factors such as.
         * <ul>
         * <li>Length</li
         * <li>Number of upper case letters</li>
         * <li>Number of lower case letters</li>
         * <li>Number of digits</li>
         * <li>Number of digits or symbols in the middle</li>
         * <li>Any repeating characters</li>
         * <li>Sequences</li>
         *
         * It also adds bonuses if the password is 8 characters or more and it has a certain combination of lowercase,
         * uppercase, digits and symbols.
         *
         * @param password the password to check the strength of
         * @return the strength which is a value between zero and one hundred (0 - 100).
         */
        public static int strength(final String password) {
            int strength = 0;
     
            // Length
            strength += (password.length() * 4);
     
            // Upper case letters
            final int upperCase = matches(password, "[A-Z]");
     
            if (upperCase > 0) {
                strength += ((password.length() - upperCase) * 2);
            }
     
            // Lower case letters
            final int lowerCase = matches(password, "[a-z]");
     
            if (lowerCase > 0) {
                strength += ((password.length() - lowerCase) * 2);
            }
     
            // Numbers
            final int numbers = matches(password, "[0-9]");
     
            if (numbers > 0) {
                strength += (numbers * 4);
            }
     
            if (numbers == password.length()) {
                strength -= numbers;
            }
     
            // Sepcial characters
            final int specialCharacters = matches(password, "[:,!,@,#,$,%,^,&,*,?,_,~]");
     
            if (specialCharacters > 0) {
                strength += (specialCharacters * 6);
            }
     
            // Letters only
            final int letters = matches(password, "[a-z|A-Z]");
     
            if (letters == password.length()) {
                strength -= letters;
            }
     
            // Middle numbers
            int middles = 0;
     
            for (int j = 0; j < NUMBERS.length(); ++j) {
                if ((password.indexOf(NUMBERS.charAt(j)) > 0) && (password.indexOf(NUMBERS.charAt(j)) < password.length() - 1)) {
                    ++middles;
                }
            }
     
            // Middle symbols
            for (int j = 0; j < SYMBOLS.length(); ++j) {
                if ((password.indexOf(SYMBOLS.charAt(j)) > 0) && (password.indexOf(SYMBOLS.charAt(j)) < password.length())) {
                    ++middles;
                }
            }
     
            strength += (middles * 2);
     
            // Repeat charaters
            final List<Character> done = new ArrayList<Character>();
            int repeats = 0;
     
            for (int i = 0; i < password.length(); ++i) {
                int matches = 0;
     
                for (int j = 0; j < password.length(); ++j) {
                    if (password.toLowerCase().charAt(i) == password.toLowerCase().charAt(j) && !done.contains(password.toLowerCase().charAt(i))) {
                        ++matches;
                    }
                }
     
                if (matches > 1) {
                    strength -= (matches * (matches - 1));
                    repeats += (matches * (matches - 1));
                    done.add(password.toLowerCase().charAt(i));
                }
            }
     
            // Consequtive upper case letters
            final int consequtiveUpperCaseLetters = matches(password, "[A-Z]{2}");
            strength -= (consequtiveUpperCaseLetters * 2);
     
            // Consequtive lower case letters
            final int consequtiveLowerCaseLetters = matches(password, "[a-z]{2}");
            strength -= (consequtiveLowerCaseLetters * 2);
     
            // Consequtive numbers
            final int consequtiveNumbers = matches(password, "[0-9]{2}");
            strength -= (consequtiveNumbers * 2);
     
            // Sequential characters
            for (int i = 0; i < password.length(); ++i) {
                final int index = ALPHA_CHARACTERS.indexOf(String.valueOf(password.charAt(i)).toLowerCase());
     
                if (index != -1 && index < ALPHA_CHARACTERS.length() - 3) {
                    final String forwardSequence = ALPHA_CHARACTERS.substring(index, index + 3);
                    final String reverseSequence = new StringBuffer(forwardSequence).reverse().toString();
     
                    if (password.indexOf(forwardSequence) != -1 || password.indexOf(reverseSequence) != -1) {
                        strength -= 3;
                    }
                }
            }
     
            // Sequential numbers
            for (int i = 0; i < password.length(); ++i) {
                final int index = NUMBERS.indexOf(String.valueOf(password.charAt(i)).toLowerCase());
     
                if (index != -1 && index < NUMBERS.length() - 3) {
                    final String forwardSequence = NUMBERS.substring(index, index + 3);
                    final String reverseSequence = new StringBuffer(forwardSequence).reverse().toString();
     
                    if (password.indexOf(forwardSequence) != -1 || password.indexOf(reverseSequence) != -1) {
                        strength -= 3;
                    }
                }
            }
     
            // Bonuses
            int bonus = 0;
     
            if (password.length() >= 8) {
                ++bonus;
     
                if (((double) upperCase / (double) password.length()) >= 0.25) {
                    ++bonus;
                }
     
                if (((double) lowerCase / (double) password.length()) >= 0.25) {
                    ++bonus;
                }
     
                if (((double) numbers / (double) password.length()) >= 0.25) {
                    ++bonus;
                }
                if (((double) specialCharacters / (double) password.length()) >= 0.25) {
                    ++bonus;
                }
            }
     
            strength += (bonus * 2);
     
            if (strength < 0) {
                strength = 0;
            } else if (strength > 100) {
                strength = 100;
            }
     
            return strength;
        }
     
        private static int matches(final String string, final String regexPattern) {
            int matches = 0;
            final Pattern pattern = Pattern.compile(regexPattern);
            final Matcher matcher = pattern.matcher(string);
     
            while (matcher.find()) {
                ++matches;
            }
     
            return matches;
        }
     
    }

    Above is the actual password class, it contains some weird and freaky stuff to check the strength but the actual generate method is very simple. If you have any questions let me know and I shall try to answer them.

    // Json

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