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A smart key is an electronic access and authorization system that is available either as standard equipment, or as an option in several car designs. It was first developed by Siemens in 1995 and introduced by Mercedes-Benz under the name 'Key-less Go' in 1998 on the W220 S-Class, after the design patent was filed by Daimler-Benz on May 17, 1997.[1]
How it works[edit]
The smart key allows the driver to keep the key fob pocketed when unlocking, locking and starting the vehicle. The key is identified via one of several antennas in the car's bodywork and a radio pulse generator in the key housing. Depending on the system, the vehicle is automatically unlocked when a button or sensor on the door handle or trunk release is pressed. Vehicles with a smart-key system have a mechanical backup, usually in the form of a spare key blade supplied with the vehicle. Some manufacturers hide the backup lock behind a cover for styling.
Vehicles with a smart-key system can disengage the immobilizer and activate the ignition without inserting a key in the ignition, provided the driver has the key inside the car. On most vehicles, this is done by pressing a starter button or twisting an ignition switch.
When leaving a vehicle that is equipped with a smart-key system, the vehicle is locked by either pressing a button on a door handle, touching a capacitive area on a door handle, or simply walking away from the vehicle. The method of locking varies across models.
Some vehicles automatically adjust settings based on the smart key used to unlock the car. User preferences such as seat positions, steering wheel position, exterior mirror settings, climate control (e.g. temperature) settings, and stereo presets are popular adjustments. Some models, such as the Ford Escape, even have settings to prevent the vehicle from exceeding a maximum speed if it has been started with a certain key.
Nomenclature[edit]
Manufacturers use keyless authorization systems under different names:
- Acura: Keyless Access System
- Audi: Advanced Key
- Aston Martin: Keyless Entry and Push Button Start
- BMW: Comfort Access or Display Key
- Bugatti: Keyless Entry Remote
- Cadillac: Adaptive Remote Start & Keyless Access
- FIAT-Chrysler: Keyless Enter-N-Go
- Ford: Intelligent Access with push-button start
- General Motors: Passive Entry Passive Start (PEPS)
- Honda: Smart Entry System
- Hyundai: Proximity Key and smart entry key
- Infiniti: Infiniti Intelligent Key with Push-button Ignition
- Isuzu: Genius Entry
- Jaguar Cars: Smart Key System
- Kia Motors: Smart Key System
- Lexus: Smart Access System
- Lincoln: Intelligent Access System
- Mazda: Advanced Keyless Entry & Start System
- Mercedes-Benz: Keyless Go integrated into SmartKeys
- Mini: Comfort Access
- Mitsubishi Motors: FAST Key System
- Nissan: Nissan Intelligent Key
- Porsche: Porsche Entry & Drive System
- Proton: Passive Keyless Entry
- Renault: Hands Free Keycard
- Riverside Manufacturing LLC: Intelli-Fob
- SsangYong Motor: Smart Key System
- Subaru: Keyless Smart Entry With Push-Button Start
- Suzuki: SmartPass Keyless entry & starting system
- Tesla: Model S Key
- Toyota: Smart Key System
- Volkswagen: Keyless Entry & Keyless Start or KESSY
- Volvo: Personal Car Communicator 'PCC' and Keyless Drive or Keyless Drive
- Mahindra & Mahindra: Smart Key Module
Insurance standard[edit]
In 2005, the UK motor insurance research expert Thatcham introduced a standard for keyless entry, requiring the device to be inoperable at a distance of more than 10 cm from the vehicle.[2] In an independent test, the Nissan Micra's system was found to be the most secure, while certain BMW and Mercedes keys failed, being theoretically capable of allowing cars to be driven away while their owners were refueling.[3] Despite these security vulnerabilities, auto theft rates have decreased 7 percent between 2009 and 2010, and the National Insurance Crime Bureau credits smart keys for this decrease.[4][5]
SmartKeys[edit]
SmartKeys was developed by Siemens in the mid-1990s and introduced by Mercedes-Benz in 1997 to replace the infrared security system introduced in 1989. Daimler-Benz filed the first patents for SmartKey on February 28, 1997 in German patent offices, with multifunction switchblade key variants following on May 17, 1997.[6][7][8][9] The device entailed a plastic key to be used in place of the traditional metal key. Electronics that control locking systems and the ignitions made it possible to replace the traditional key with a sophisticated computerized 'Key'. It is considered a step up from remote keyless entry. The SmartKey adopts the remote control buttons from keyless entry, and incorporates them into the SmartKey fob.
Once inside a Mercedes-Benz vehicle, the SmartKey fob, unlike keyless entry fobs, is placed in the ignition slot where a starter computer verifies the rolling code. Verified in milliseconds, it can then be turned as a traditional key to start the engine. The device was designed with cooperation of Siemens Automotive and Huf exclusively for Mercedes-Benz, but many luxury manufacturers have implemented similar technology based on the same idea.[citation needed] In addition to the SmartKey, Mercedes-Benz now integrates as an option Keyless Go; this feature allows the driver to keep the SmartKey in their pocket, yet giving them the ability to open the doors, trunk as well as starting the car without ever removing it from their pocket.
The SmartKey's electronics are embedded in a hollow, triangular piece of plastic, wide at the top, narrow at the bottom, squared-off at the tip with a half-inch-long insert piece. The side of the SmartKey also hides a traditional Mercedes-Benz key that can be pulled out from a release at top. The metal key is used for valet purposes such as locking the glovebox and/or trunk before the SmartKey is turned over to a parking attendant. Once locked manually, the trunk cannot be opened with the SmartKey or interior buttons. The key fob utilizes a radio-frequency transponder to communicate with the door locks, but it uses infrared to communicate with the engine immobilizer system. Original SmartKeys had a limited frequency and could have only been used in line-of-sight for safety purposes. The driver can also point the smart key at the front driver side door while pushing and holding the unlock button on the SmartKey and the windows and the sunroof will open in order to ventilate the cabin. Similarly, if the same procedure is completed while holding the lock button, the windows and sunroof will close. In cars equipped with the Active Ventilated Seats, the summer opening feature will activate the seat ventilation in addition to opening the windows and sunroof.
Display Key[edit]
Display Key is a type of smart key developed by BMW that has a small LCD color touchscreen on it. It performs the standard functions that a key fob would normally do (locking, unlocking & keyless start), but because of the screen you can also perform a number of the features from BMW's app. One of which includes commanding your car to self park from the key (if your car has self parking capability). The key is currently available for the 5 series, 7 series, X5, and X7. The key is rechargeable and can last about 3 weeks on standby. It can be charged via the micro usb port on the side or wirelessly on your BMW center console.
Keyless Go[edit]
Keyless Go (also: Keyless Entry / Go; Passive Entry / Go) is Mercedes' term for an automotive technology which allows a driver to lock and unlock a vehicle without using the corresponding SmartKey buttons.[10] Once a driver enters a vehicle with an equipped Keyless Go SmartKey or Keyless Go wallet-size card, they have the ability to start and stop the engine, without inserting the SmartKey. A transponder built within the SmartKey allows the vehicle to identify a driver. An additional safety feature is integrated into the vehicle, making it impossible to lock a SmartKey with Keyless Go inside a vehicle.
The system works by having a series of LF (low frequency 125 kHz) transmitting antennas both inside and outside the vehicle. The external antennas are located in the door handles. When the vehicle is triggered, either by pulling the handle or touching the handle, an LF signal is transmitted from the antennas to the key. The key becomes activated if it is sufficiently close and it transmits its ID back to the vehicle via RF (Radio frequency >300 MHz) to a receiver located in the vehicle. If the key has the correct ID, the PASE module unlocks the vehicle.
The hardware blocks of a Keyless Entry / Go Electronic control unit ECU are based on its functionality:
Error generating a key for authentication passphrase change. When you use the IdentityFile option in your /.ssh/config you point to the private, not the public, key.From man sshconfig: IdentityFileSpecifies a file from which the user's DSA, ECDSA or DSA authentication identity is read. The problem I am facing is that ssh is asking for my passphrase even though I did not set a passphrase. The default is /.ssh/identity for protocol version 1, and /.ssh/iddsa, /.ssh/idecdsa and /.ssh/idrsa for protocol version 2.So, your /.ssh/config entry should look like: Host github.comHostname github.comUser gitPubkeyAuthentication yesIdentityFile /home/me/.ssh/github. I have read many threads to verify that my permissions are set up correctly and have generated a new key for github.
- transmitting low-frequency LF signals via the 125 kHz power amplifier block
- receiving radio frequency RF signals (> 300 MHz) from the built-in ISM receiver block
- encrypting and decrypting all relevant data signals (security)
- communicating relevant interface signals with other electronic control units
Inside Outside detection[edit]
The smart key determines if it is inside or outside the vehicle by measuring the strength of the LF fields. In order to start the vehicle, the smart key must be inside the vehicle.
System reaction times[edit]
The mark of a good passive entry system is that the user never hits the 'wall'. This happens when the user pulls the door handle to its full extent before the door is unlocked. The handle has to be released and pulled again to gain access. Good systems have an override feature that allows the doors to be opened more quickly.
Security requirements[edit]
It is important that the vehicle can't be started when the user and therefore the smart key is outside the vehicle. This is especially important at fueling stations where the user is very close to the vehicle. The internal LF field is allowed to overshoot by a maximum of 10 cm to help minimise this risk. Maximum overshoot is usually found on the side windows where there is very little attenuation of the signal.
A second scenario exists under the name 'relay station attack' (RSA). The RSA is based on the idea of reducing the long physical distance between the car and the regular car owner's SmartKey. Two relay stations will be needed for this: The first relay station is located nearby the car and the second is close to the SmartKey. So on first view, the Keyless Entry / Go ECU and the SmartKey could communicate together. A third person at the car could pull the door handle and the door would open. However, in every Keyless Entry / Go system provisions exist to avoid a successful two-way communication via RSA. Some of the most known are:
- measuring group delay time to detect illegal high values
- measuring third-order intercept point to detect illegal intermodulation products
- measuring field strength of the electric field
- measuring the response time of 125 kHz LC circuit
- using a more complex modulation (i.e. quadrature amplitude modulation) which can't be demodulated and modulated by a simple relay station
Furthermore, Keyless Entry / Go communicates with other Control Units within the same vehicle. Depending on the electric car architecture, the following are some Control Systems that can be enabled or disabled:
- ESCL Electric Steering Column Lock
- EIS Electronic Ignition Switch
- Central door locking system
- Engine Control Unit (Motor management system)
- BCU Body control unit
Another possibility is using a motion sensor within the key fob.[11][12]
Internal LF field dead spots[edit]
Dead spots are a result of the maximum overshoot requirement from above. The power delivered to the internal LF antennas has to be tuned to provide the best performance i.e. minimum dead spots and maximum average overshoot. Dead spots are usually near the extremities of the vehicle e.g. the rear parcel shelf.
Battery Backup[edit]
If the battery in the smart key becomes depleted, it is necessary for there to be a backup method of opening and starting the vehicle. Opening is achieved by an emergency (fully mechanical) key blade usually hidden in the smart key. On many cars emergency starting is achieved by use of an inductive coupling. The user either has to put the key in a slot or hold it near a special area on the cockpit, where there is an inductive coil hidden behind which transfers energy to a matching coil in the dead key fob using inductive charging.
Slots have proven to be problematic, as they can go wrong and the key becomes locked in and cannot be removed. Another problem with the slot is it can't compensate for a fob battery below certain operating threshold. Most smart key batteries are temperature sensitive causing the fob to become intermittent, fully functional, or inoperative all in the same day.
Special Cases[edit]
A Keyless Entry / Go system should be able to detect and handle most of the following cases:
- SmartKey Transponder was forgotten in the rear trunk
- More than one SmartKey is present inside the car
- SmartKey getting lost during the drive
- Smartkey battery low (Limp-Home)
History[edit]
Smart Car Key Fob
The system is based on a technology invented by Siemens VDO called PASE: Passive Start and Entry System. It operates in the ISM band of radio frequencies. Keyless Entry / Go was introduced first by Mercedes-Benz in the S-Class car series in 1998.
Smart Car Key Problem
Outlook[edit]
Today a Keyless Entry / Go system is a state-of-the art technology and still has a lot of potential to optimise. Here are some general trends of the advance (AD) and series development (SD):
- SD: reduction of used LF antennas in low-cost compact cars (results in a loss of detection quality)
- AD: using electric field antennas instead of magnetic field antennas (cost reduction)
- AD: using microwave frequencies (radar) instead of an LF and RF combination (more comfort)
- AD: Biometricauthentication would identify the user and not the SmartKey transponder
Effectiveness[edit]
A test by ADAC revealed that 20 car models with Keyless Go could be entered and driven away without the key.[13][14][15][16] In 2014, 6,000 cars (about 17 per day) were stolen using keyless entry in London.[17]
See also[edit]
References[edit]
- ^DPMAregister Designs - Registerauskunft zum Design
- ^ThatchamArchived 2007-12-11 at the Wayback Machine
- ^Auto Express: Micra's Top of the Fobs
- ^Saylor, Michael (2012). The Mobile Wave: How Mobile Intelligence Will Change Everything. Perseus Books/Vanguard Press. p. 100. ISBN978-1593157203.
- ^'Vehicle theft post Sixth Consecutive Yearly Decline'. NICB. 2010-09-20.
- ^DPMAregister Designs - Registerauskunft zum Design
- ^DPMAregister Designs - Registerauskunft zum Design
- ^DPMAregister Designs - Registerauskunft zum Design
- ^DPMAregister Designs - Registerauskunft zum Design
- ^'KEYLESS-GO®'. Mercedes-Benz USA.
- ^http://essatech.de/produkty/ - Keyless Defender
- ^https://www.motoringresearch.com/car-news/ford-fiesta-focus-theft-proof-keyless-entry-fobs/ - Ford Fiesta and Focus keyless entry fobs are now theft-proof
- ^Saarinen, Martin (18 March 2016). 'Tests uncover major security risk to keyless cars'. Auto Express. Retrieved 19 March 2016.
- ^Keyless-Diebstahl - vom ADAC untersuchte AutosArchived 2016-03-27 at the Wayback MachineADAC, 15 March 2016
- ^Autos mit Keyless leichter zu klauenADAC
- ^ADAC demonstrates keyless theft on YouTube
- ^Finnerty, Joe (5 February 2015). 'Keyless car crime up as gangs target vans'. Auto Express. Retrieved 19 March 2016.
Smart Car Key Code Generator Reviews
External links[edit]
Free Key Code Generator
- [https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_garcia.pdf Security Flaws of Remote