Car key

Modern key designs are usually symmetrical, and some use grooves on both sides, rather than a cut edge, to actuate the lock.

Some valet keys, particularly those to high-performance vehicles, go so far as to restrict the engine's power output to prevent joyriding.

More sophisticated systems make ignition dependent on electronic devices, rather than the mechanical keyswitch.

A number of these systems, such as KeeLoq and Megamos Crypto have been demonstrated to be weak and vulnerable to cryptanalytic attacks.

[5]In the 1950s, early versions of "flip keys" resembling jack knives were made by the Signa-Craft company out of New York with various period U.S. automaker's prototype "Dream Cars" like the Pontiac Strato-Streak and the Cadillac El Camino featured on them.

These were automotive keys that featured an enameled rendition of the auto manufacturer's logo on the bow and were plated in 14k gold.

During the early 1960s, these special keys became so popular that oil companies like Mobil, Texaco, and Union 76 began issuing their own logoed versions as promotional items for their customers.

[citation needed] Meanwhile, companies like Briggs and Stratton, and Hurd, were making key blanks with automaker's logos on them.

Picky car show judges will often score a vehicle down for not having a correct set of keys with the original automaker's logo, and lock code, stamped on them.

Typically the key has an identical wavy groove on the back of the blade, making it symmetrical so it works no matter which way it is inserted.

When the key is turned in the ignition cylinder, the car's computer transmits a radio signal to the transponder circuit.

In case of breakage, an owner may get a new key in two ways – from their car dealership or using automotive locksmith services.