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former case, the group consists of people who have paid for the bits in question; in the latter, they meet some other criterion (such as being over 18, or nonresidents of Singapore, or whatever) Sometimes, they overlap, as with the common convention of restricting online pornography to users who can use a credit card with an age check service (The assumption that all credit card holders are 18 or over may not hold up forever, giving rise to an interesting security failure of the changing environment type) In general, users real names matter: if identity is no longer sacrosanct, liability for sedition, copyright infringement, and defamation become shaky Privacy is also largely an access control issue It s about being able to limit the number of people who can see who you re exchanging email with, what you re reading and what music you re listening to.

The most modern car door locks use a more sophisticated two-pass protocol, often called challenge-response As the car key is inserted into the steering lock, the engine management unit sends a challenge, consisting of a random n-bit number to the key using a short-range radio signal The car key computes a response by encrypting the challenge In this way, writing E for the engine controller, T for the transponder in the car key, K for the cryptographic key shared between the transponder and the engine controller, and N for the random challenge, the protocol may look something like: E!T:N T ! E : {T, N} K This is still not bulletproof.

In theory, there is no compelling reason why they should be in conflict, and in the pre-electronic world, they usually weren t Copyright was protected by the cost of small-scale duplication; it was simpler and cheaper to buy a book or a record than to make a single copy, and people who made large numbers of copies could usually be tracked down and prosecuted The cost barrier to copying was eroded significantly by the photocopier and the cassette recorder, but they didn t change the basic economics So books, records, and videos can be bought for cash and traded secondhand But the move to a digital world is changing this Although there are some systems, such as pay-TV, which depend on a physically tamper-resistant device, most copyright control is moving in the direction of registration.

In one system, the random numbers generated by the engine management unit turned out to be rather predictable, so it was possible for a thief to interrogate the key in the car owner s pocket, as he passed, with the anticipated next challenge In fact, most of the widely used software products that incorporate encryption including Kerberos, Netscape, and PGP have been broken at some time or another because their random-number generators weren t random enough [340, 256] The fix used varies from one application to another It s possible to build hardware randomnumber generators using radioactive decay, but this isn t common because of environmental concerns There are various sources of randomness that can be used in large systems such as PCs; for example, it s possible to use the small variations in the rotational velocity of the hard disk caused by air turbulence [225].

Once you have bought a software product, you re supposed to register as a user, and this business model is spreading to other media which in turn is undermining privacy In this chapter, I m going to use a technical view of privacy Confidentiality means keeping information secret because of an obligation owed to a third party, while privacy refers to the ability to control the dissemination of information about oneself In the privacy applications I ve discussed up till now, these tend to overlap For example, my medical privacy is implemented by imposing on my doctor a duty of confidentiality But in this chapter I m interested in the mechanisms I can use to protect my own privacy directly, starting from encrypted electronic mail and going up through online pseudonyms and networks of anonymous remailers to file systems whose owners can plausibly deny knowledge of their contents.