chiave
pulsante
Mi avete fatto venire fino a quassù e mi avete detto...mi avete detto che mi compravate una bomba...arriverò tardi per il pranzo e mia mamma...ahhh...ahhh..e non mi farà mangiare per punizione..aaaaaah che vigliacchi.........nessuno ha una cioccolata??? un croccante???
Pedivellate sullo stinco ne ho prese anch'io. E avevo un polpaccio destro che era il doppio del sinistro a furia di spedalare. Però non ho mai dovuto cambiare la batteria all'Aerox.![]()
Sotto i 6000rpm è un mezzo agricolo.
La teoria è quando si conosce il funzionamento di qualcosa ma quel qualcosa non funziona.
La pratica è quando tutto funziona ma non si sa come.
Spesso si finisce con il coniugare la teoria con la pratica: non funziona niente e non si sa il perché.
The world can now rest easy. Toyota has officially embraced "Prii" as the plural of Prius.
pensa che il vor era 600 ed aveva la "spedivellata" in avanti
doppia libidine sullo stinco!![]()
Mi avete fatto venire fino a quassù e mi avete detto...mi avete detto che mi compravate una bomba...arriverò tardi per il pranzo e mia mamma...ahhh...ahhh..e non mi farà mangiare per punizione..aaaaaah che vigliacchi.........nessuno ha una cioccolata??? un croccante???
in ogni caso c'è sempre voluto una sana dose di masochismo per potersi comprare una VOR! La moto più ignuranta che io ricordi!
Io l'esperienza l'ho accumulata con un EXC 520, che ogni tanto pensava bene di ingolfarsi in mezzo alle mulattiere... Una volta sono dovuti venire a recuperarmi col Jimny!![]()
La teoria è quando si conosce il funzionamento di qualcosa ma quel qualcosa non funziona.
La pratica è quando tutto funziona ma non si sa come.
Spesso si finisce con il coniugare la teoria con la pratica: non funziona niente e non si sa il perché.
The world can now rest easy. Toyota has officially embraced "Prii" as the plural of Prius.
Car Theft by Antenna
Researchers beat automatic locking and ignition systems.
THURSDAY, JANUARY 6, 2011BY ERICA NAONE E-mail Audio » Print
Car thieves of the future might be able to get into a car and drive away without forced entry and without needing a physical key, according to new research that will be presented at the Network and Distributed System Security Symposium next month in San Diego, California.
The researchers successfully attacked eight car manufacturers' passive keyless entry and start systems—wireless key fobs that open a car's doors and start the engine by proximity alone.
Srdjan Capkun, an assistant professor of computer science in the system security group at ETH Zurich in Switzerland, who led the work, says he was inspired to investigate the security of keyless entry and start systems after buying a car that had one. Capkun and Aurélien Francillon and Boris Danev, both researchers in the same institution, examined 10 car models from the eight manufacturers. They were able to access all 10 and drive them away by intercepting and relaying signals from the cars to their wireless keys. While they could relay the signals from the key back to the car as well, usually they did not need to because the key transmits its signals up to around 100 meters. The attack works no matter what cryptography and protocols the key and car use to communicate with each other.
Normally, when a wireless key is within a few meters of the right car, it detects a low-powered signal that causes it to issue a command that opens the car enable the ignition. The researchers used a pair of antennas to transmit these signals from the car to the key when the key was farther away, tricking the car into opening without the ordinary authorization. One antenna needs to be very close to the car, and one needs to be within eight meters of the key.
The researchers came up with two versions of the attack. In one, they ran a cable from near the car to near the key and used it to transmit the signals. They conducted the other wirelessly. Francillon says that the materials for the wired attack cost about $50, and those for the wireless attack cost between $100 and $1,000, depending on the electronic components used.
The researchers tested a few scenarios. An attacker could watch a parking lot and have an accomplice watch as car owners as entered a nearby store. The accomplice would only need to be within eight meters of the targeted owner's key fob, making it easy to avoid arousing suspicion. In another scenario, a car owner might leave a car key on a table near a window. An antenna placed outside the house was able to communicate with the key, allowing the researchers then to start the car parked out front and drive away.
A car won't open or start if the signal from its key takes too long to arrive, so the researchers devised a way to speed communication between their antennas. Most relay attacks require the signals to be converted from analog to digital and back, which takes time. The researchers were able to keep the signals in analog format, which reduced their delay from microseconds to nanoseconds and made their attack more difficult to detect.
The researchers suggest things that car owners and manufacturers can do to protect themselves. Car owners can shield their keys when they're not in use, to prevent attackers from communicating with them. Alternatively, manufacturers could add a button to fobs that would allow owners to deactivate and reactivate them. Capkun worries, however, that these types of solutions detract from the convenience that makes passive keyless entry systems worthwhile.
Ultimately, he says, manufacturers will need to add secure technology that allows the car to confirm that the key is in fact nearby. "I don't see a way around it," Capkun says. His group is actively working on protocols that would accomplish this.
David Wagner, a professor of computer science at the University of California at Berkeley who has studied the cryptographic systems used in keyless entry systems, says the research "should help car manufacturers improve auto security systems in the future."
Wagner doesn't think the research ought to make car owners anxious. "There are probably easier ways to steal cars," he says. But, he adds, a "nasty aspect of high-tech car theft" is that "it doesn't leave any sign of forced entry," so if a thief did use this method to steal a car, he says, it might be hard for police and insurance companies to get sufficient evidence of what happened. Wagner believes that manufacturers, police, and insurance companies all need to prepare for this eventuality.
"Automobiles are a key example of a system that is pervasively computerized," so they need to be thoroughly examined to ensure they are secure, says Tadayoshi Kohno, an assistant professor of computer science at the University of Washington. Kohno helped form the Center for Automotive Embedded Systems Security, which is dedicated to identifying and solving security problems with car security systems before they cause problems in the real world.
Via Technology Review: The Authority on the Future of Technology
[cit] "se il potere è in mano a 4 coglioni basta trovarsi davanti 4 coglioni un pò più grandi"
Vediamo se ho capito bene. Si parla di quelle chiavi che agiscono per prossimità, non delle chiavi elettroniche tout court.
L'attacco consiste nel far credere, grazie a ripetitori/amplificatori di segnale, che la chiave si trova a distanza di tiro dall'auto. A quel punto il ladro può aprile l'autovettura e accendere il motore.
Faccio una domanda stupida: che cosa succede, con questo tipo di chiavi, quando, a macchina avviata ed in movimento, la macchina stessa "perde" il segnale della chiave? Io suppongo, per ragioni di sicurezza, nulla; sarebbe brutto che si spegnesse il motore durante un sorpasso in autostrada solo perché la batteria della chiave ha esalato l'ultimo. Qualcuno conferma?
Non è così facile, perché la ripetizione allunga i tempi di risposta ed i sistema più avanzati lo riconoscono. Una volta aperta l'auto il sistema la interroga nuovamente più volte.
Se ad auto accesa la chiave viene a mancare, nelle auto che ho provato io si spegnevano al primo arresto, come capita con alcuni antifurto satellitari. Ovviamente se sei proprietario ed hai la chiave con te (scarica), la riaccendi con la chiave di emergenza.
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