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applied cryptography - protocols, algorithms, and source code in c

10d which is required for the design development

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Unformatted text preview: all cash transactions; an online system would be too cumbersome. — Loss tolerance. If a user loses his wallet, or if it breaks or is stolen, he can recover his money. — Support for different currencies. — An open architecture and open system. A user should be able to pay for arbitrary services, such as shopping, telephone, and public transport, by a range of service providers. The system should be interoperable between any number of electronic money issuers, and between different wallet types and manufacturers. — Low cost. At this writing there is a software version of the system, and the consortium is hard at work on a hardware prototype. 25.9 ISO/IEC 9979 In the mid-80s, the ISO tried to standardize DES, which by then was already a FIPS and an ANSI standard. After some political wrangling, the ISO decided not to standardize cryptographic algorithms, but instead to register algorithms. Only encryption algorithms can be registered; hash functions and signature schemes cannot. Any national body can submit an algorithm for registration. Currently only three algorithms have been submitted (see Table 25.4). A submission includes information about applications, parameters, implementations, modes, and test vectors. A detailed description is optional; it is possible to submit secret algorithms for registration. The fact that an algorithm is registered does not imply anything about its quality, nor is registration an approval of the algorithm by the ISO/IEC. Registration merely indicates that a single national body wants to register the algorithm, based on whatever criteria that body uses. I am not impressed with this idea. Registration obstructs the standardization process. Rather than agreeing on a few algorithms, the ISO is allowing any algorithm to be registered. With so little control over what is registered, stating that an algorithm is “ISO/IEC 9979 Registered” sounds a whole lot better than it is. In any case, the registry is maintained by the National Computer Centre Ltd., Oxford Road, Manchester, M1 7ED, United Kingdom. Table 25.4 ISO/IEC 9979 Registered Algorithms Name B-CRYPT IDEA LUC Registration Number 0001 0002 0003 25.10 Professional, Civil Liberties, and Industry Groups Electronic Privacy Information Center (EPIC) EPIC was est...
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