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three approaches, such as in the level of resistance they offer to various kinds of replay attack (We ll discuss these later) But in very low-cost systems, the first two predominate, as it tends to be cheaper to have a communication channel in one direction only Key management in such devices can be simple A typical garage token s key KT is simply its serial number encrypted under a global master key, KM, known to the central server: KT = {T} KM This is known as key diversification It gives a very simple way of implementing access tokens, and is very widely used in smartcard-based systems as well But there is still plenty of room for error At least two manufacturers have made the mistake of only checking that the nonce is different from last time, so that, given two valid codes A and B, the series ABABAB .

Set WordObj = CreateObject( Word.Application )

was interpreted as a series of independently valid codes In one car lock, the thief could open the door by replaying the last-but-one code Another example comes from the world of prepayment utility meters Over a million households in the United Kingdom, plus many millions in developing countries, have an electricity or gas meter designed so that they can purchase encrypted tokens to take home and insert into the meter, which then dispenses the purchased quantity of electricity or gas One electricity meter widely used in South Africa checked only that the nonce in the decrypted command was different from last time So the customer could charge the meter up to the limit by buying two low-value power tickets and then repeatedly feeding them in one after the other [39].

The question of whether to use a random number or a counter is not as easy as it might seem [195] With random numbers, the lock has to remember a reasonable number of past codes There s also the valet attack; someone who has temporary access to the token such as a valet parking attendant can record a number of access codes and replay them later to steal your car The problem with counters is maintaining synchronization A key may be used for more than one lock, and may also be activated by jostling against something in your pocket (I once took an experimental token home where it was gnawed by my dogs) So there has to be a way to recover after the counter has been incremented hundreds or possibly even thousands of times.

class Impl : public Interface { public: void Foo(){...} };

This can be turned to advantage by allowing the lock to learn, or synchronize on, a key under certain conditions; but the details are not always designed thoughtfully One common product uses a 16-bit counter, and allows access when the counter value that is deciphered is the last valid code incremented by no more than 16 To cope with cases where the token has been used more than 16 times elsewhere (or chewed by a family pet), the lock will open on a second press, provided that the counter value has been incremented between 17 and 32,767 times since a valid code was entered (the counter rolls over so that 0 is the successor of 65,535) This opens it to a replay attack, because someone only needs six access codes say for values 0, 1, 20,000, 20,001, 40,000 and 40,001 to break the system completely.

control of servers who are sober and, therefore, in a position to identify seriously impaired drivers. The early 1980s saw the widespread introduction of programs intended to enable and encourage those who sell alcohol to withhold it from patrons who are, or might become, impaired by alcohol. Efforts to gain intervention by sellers have taken two general forms: legal sanctions against sellers who dispense alcohol irresponsibly, and training programs that teach sellers how to behave responsibly. Sanctions against the irresponsible sale of alcoholic beverages has itself taken two forms: (a) civil liability laws that allow victims of irresponsible service of alcohol to collect nancial damages from sellers; and (b) alcohol control laws imposing administrative and criminal penalties for the illegal sale of alcohol to the underaged and intoxicated. Alcohol prevention measures involving licensed establishments have been summarized by Mosher (1991).