I never like to give out my date of birth to companies as loss of this data to others can cause lots of problems. With the DOB hackers can source state pension data, private pensions NHS details. Why not use some other details such as favourite car number plate or That could not be traced back to any other data online and most people have one car that they owned with note. Mine was a two year long court case. I will never forget that!!! DOB if I am correct can only give about 25000 combinations. Starting at 18 and going to 80 years with 365 days in a year. I think number plates would give about 400,000,000 combinations and could not be linked to other online site information. Letters x letters x 0-9 x 0-9 x letters x letters x letters (22X22x9x9x22x22x22 = 417,444,192 Letters Q and O plus I are not used and one more I'm not sure of.