Why are car keys and house keys different?

Many car keys are now of a much more secure (uncopyable, unpickable) design than house keys. This is because cars tend to get stolen a lot more often than houses do. And, it is easier to hide a car or reuse the parts after you have stolen it than it is with a house.

1. Should car keys be separate from house keys?
2. Are car keys different?
3. Are any two keys the same?
4. Why are car keys two sided?

Should car keys be separate from house keys?

And since fobs invite relay attacks, it's much better to have it move around with you rather than to leave it in one place. As annoying as it is initially, getting into the habit of having your keys separated in general is a good idea, including not keeping house keys and car keys on the same keychain.

Are car keys different?

Car keys are not unique to one vehicle

And, if you have a car made before 1995 you could be at risk of someone having a twin key to your car. It's hard to believe and highly unlikely it will ever happen to you but there is a possibility of someone gaining access to your car.

Are any two keys the same?

No two copies of keys are exactly the same, even if they were both made from key blanks that are struck from the same mould or cut from the same duplicating/milling machine with no changes to the bitting settings in between.

Why are car keys two sided?

Ford Motors introduced the double-sided key in 1965. Not only did this ease the entry or ignition speed, but the double-cut also increased security. Again, keys were differentiated for door or ignition. Remote control door locks first appeared in 1987 in models produced by Cadillac and AMC.