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

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Unformatted text preview: t key is an invertible quasilinear automaton and a linear automaton, and the corresponding public key can be derived by multiplying them out term by term. Data is encrypted by passing it through the public automaton, and decrypted by passing it through the inverses of its components (in some cases provided they have been set to a suitable initial state). This scheme works for both encryption and digital signatures. The performance of such systems can be summed up by saying that like McEliece’s system, they run much faster than RSA, but require longer keys. The keylength thought to give similar security to 512-bit RSA is 2792 bits, and to 1024-bit RSA is 4152 bits. For the former case, the system encrypts data at 20, 869 bytes/sec and decrypts data at 17, 117 bytes/sec, running on a 33 Mhz 80486. Renji has published three algorithms. The first is FAPKC0. This is a weak system which uses linear components, and is primarily illustrative. Two serious systems, FAPKC1 and FAPKC2, use one linear and one nonlinear component each. The latter is more complex, and was developed in order to support identity-based operation. As for their strength, quite a lot of work has been done on them in China (where there are now over 30 institutes publishing cryptography and security papers). One can see from the considerable Chinese language literature that the problem has been studied. One possible attraction of FAPKC1 and FAPKC2 is that they are not encumbered by any U.S. patents. Thus, once the Diffie-Hellman patent expires in 1997, they will unquestionably be in the public domain. Previous Table of Contents Next Products | Contact Us | About Us | Privacy | Ad Info | Home Use of this site is subject to certain Terms & Conditions, Copyright © 1996-2000 EarthWeb Inc. All rights reserved. Reproduction whole or in part in any form or medium without express written permission of EarthWeb is prohibited. Read EarthWeb's privacy statement. To access the contents, click the chapter and section titles. Applied Cryptography, Second Edition: Protocols, Algorthms, and Source Code in C (cloth) Go!...
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