it would be easy to get your number even without a computer transaction. my company is all face to face and i accept around $8,000 a month in card payments. every payment made is all on paper. name, number, experation, ect. i also have 10 people working for me that could gain access to the card numbers. all they would have to do is write the number down after ringing up the sale. i would never know. now think of how many places you use your card that have minimum wage people handeling the trans action. every time you use your card you are handing your number out to almost every person that works there. preety scary when you think of it.