Password authentication without revealing your password

asgeirn (Asgeir S. Nilsen) — Wed, 09 May 2007 19:59:22 GMT

The majority of personalized web sites use some kind of form-based password authentication where you have two form fields for username and password, and a login button. When you submit your authentication, the password is sent in the clear to the server for verification against a user database.

Using a Javascript SHA library and one simple onsubmit protects the password in transit and also inside the user database:

Read this for more elaborations with increased security.

Handy Iterable for a range of Integers

asgeirn (Asgeir S. Nilsen) — Tue, 10 Apr 2007 14:39:26 GMT

Looping a specific number of times produces code a bit too verbose in Java. The JDK5 enhanced for statement is a handy improvement, but you still have to fall back to the traditional for statement if you want to repeat a loop, say, 10 times.

Not with this implementation of Iterable. You can use it like this:



for (int i : new Range(100))

    System.out.printf("I have said this %d times. Read dzone.com!%n", i);



class Range implements Iterable {

    

    private final Integer stop;

    

    public Range(int stop) {

        this.stop = stop;

    }



    public Iterator iterator() {

        return new Iterator() {

            

            private Integer counter = 0;



            public boolean hasNext() {

                return (counter != stop);

            }



            public Integer next() {

                if (counter == stop)

                    throw new NoSuchElementException();

                return ++counter;

            }



            public void remove() {

            }};

    }

    

}

DZone Snippets: Asgeirn's Code Snippets

Password authentication without revealing your password

Handy Iterable for a range of Integers