A recent cybersecurity study by 'Information is Beautiful' shows that many tend to use simple patterns in their security codes. Of the 3.4 million PIN numbers examined from several data breaches, the most common are 1234, 1111, 0000, 1212, 7777, 1004, 2000, 4444, 2222, 6969, 9999, 3333, 5555, 6666, 1122, 1313, 8888, 4321, 2001 and 1010.