Stanford University researchers have found a security flaw in audio-based completely automated public Turing test to tell computers and humans apart (CAPTCHAs), which are designed to provide Internet security for the visually impaired. Audio CAPTCHAs require users to listen to a string of spoken letters or numbers disguised with background noise. However, Stanford professor John Mitchell and postdoctoral fellow Eli Bursztein developed Decaptcha, a program that can understand commercial audio CAPTCHAs used by Digg, eBay, Microsoft, Yahoo, and reCAPTCHA. During testing, Decaptcha was able to decode Microsoft’s audio CAPTCHA about 50 percent of the time. In addition, it broke about one percent of reCAPTCHA’s codes, and even this small a success rate can result in a major security breach for Web sites such as YouTube and Facebook, which get hundreds of millions of page views a day. Decaptcha can recognize the distinct sounds of each letter and number, and compares the sounds it hears in audio CAPTCHAs to those sounds stored in its memory. The researchers created four million audio CAPTCHAs mixed with white noise, echoes, or music, and found that music gave the computer systems the most trouble.
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App Screenshots :

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The Pocket Bingo Free version with Ads will be available on the Android Market here: http://bit.ly/pocketbingo_android

 new Random().nextInt(10);

This will generate a unique random number between 0 and 9 (both inclusive). Similarly if you want to generate a unique random number between a fixed length, say 10 to 100, use can use a code something like :

 new Random().nextInt(90)+11;

However, while developing games or implementing Artificial Intelligence, we often require an efficient algorithm or piece of code which can generate unique random numbers within a given range.
The logic behind this is pretty simple. Take a for loop and insert all the numbers which you want to be called randomly in an ArrayList, shuffle the ArrayList and extract the numbers one by one.
The java code for this is presented below :

public class RandomNumberGenerator {
    ArrayList numbersList = new ArrayList ();
    public RandomNumberGenerator(int length) {
        for(int x=1;x<=length;x++)
            numbersList.add(x);
        Collections.shuffle(numbersList);
    }
    public int generateNewRandom(int n) {
        return numbersList.get(n);
    }
}

Now you can use this class for generation of unique random numbers in your program. Just pass the required arguement in the constructor and then use the method generateNewRandom()

Random obj = new Random();
int[] items = new int[10];
int randomPosition;

for (int i=0; i<items.length; i++) {
    items[i] = i;
}

//--- Shuffle by exchanging each element randomly
for (int i=0; i<tems.length; i++) {
    randomPosition = obj.nextInt(items.length);
    int temp = items[i];
    items[i] = items[randomPosition];
    items[randomPosition] = temp;
}