What is a bank dynamic password?

The bank gives you a half-card-sized Dongdong with a thickness of 1 mm to 3 mm. Basically, it has a screen with a set of six-digit passwords, which usually changes every minute.

Online shopping, for security reasons, generally need to enter two passwords, one is the SMS verification code sent to the mobile phone, and the other is the password on that small machine, which is safer.

The principle of doing this is that each account and the dynamic password generator under the account use the same set of 128-bit password generator equations, and then the dynamic password machine in your hand is updated synchronously with the banking system every minute. Enter the password when shopping, and the system will automatically verify the password stored in the bank card. If it is consistent, you can pay.

Because your dynamic cipher is designed to be immovable and has no interface, it is safer for bad guys to copy the information inside than those security methods that need to be connected to a computer for verification.