|Egor- Interesting article. However my experience as a Cyber Security Consultant is that 4 digit codes are worthless because a large proportion of people use their date of birth and use the same code for everything including banks cards. So I am a thief who has stolen a handbag, I have a phone and a wallet with bank cards and OH look!, a driving licence. Guess what?. The date of birth is on the licence. I can now access everything including your on line banking etc to check the balance, send abusive texts to the contacts whilst I take a couple of hundred from your account at a cash machine. Move on to biometrics.