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Unformatted text preview: so available from ftp.ox.ac.uk, ftp.dsi.unimi.it, ftp.funet.fi, ftp.demon.co.uk, Compuserve, AOL, and elsewhere. For U.S. commercial users, PGP can be bought—complete with licenses—for about $100 from a company called ViaCrypt, 9033 N 24th Ave., Phoenix, AZ, 85021; (602) 944-0773; [email protected] Several shareware front-ends are available to help integrate PGP into MS-DOS, Microsoft Windows, Macintosh, and UNIX. There are several books about PGP [601, 1394, 1495]. The source code has even been published in book form  in an attempt to frustrate the U.S. Department of State, which continues to maintain that source code is exportable on paper but not electronically. Assuming you trust IDEA, PGP is the closest you’re likely to get to military-grade encryption. 24.13 Smart Cards
A smart card is a plastic card, the size and shape of a credit card, with an embedded computer chip. It’s an old idea—the first patents were filed 20 years ago—but practical limitations made them feasible only five or so years ago. Since then they have taken off, mostly in Europe. Many countries use smart cards for pay telephones. There are also smart credit cards, smart cash cards, smart everything cards. The U.S. credit-card companies are looking at the technology, and within a few years even backwards Americans will have smart cards in their wallets. A smart card contains a small computer (usually an 8-bit microprocessor), RAM (about a quarter kilobyte), ROM (about 6 or 8 kilobytes), and either EPROM or EEPROM (a few kilobytes). Future-generation smart cards will undoubtedly have more capacity, but some physical limitations on smart cards make expansion difficult. The card has its own operating system, programs, and data. (What it doesn’t have is power; that comes when the card is plugged in to a reader.) And it is secure. In a world where you might not trust someone else’s computer or telephone or whatever, you can still trust a card that you keep with you in your wallet. P...
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This note was uploaded on 10/18/2010 for the course MATH CS 301 taught by Professor Aliulger during the Fall '10 term at Koç University.
- Fall '10