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| Classical and Contemporary Cryptology | 
 enlarge | Author: Richard J. Spillman
Publisher: Prentice Hall
Category: Book
List Price: $80.00
Buy Used: $34.30
You Save: $45.70 (57%)
New (6) Used (15) from $34.30
Avg. Customer Rating:  1 reviews
Sales Rank: 97452
Media: Hardcover
Number Of Items: 1
Pages: 304
Shipping Weight (lbs): 1.5
Dimensions (in): 9.3 x 7.1 x 0.8
ISBN: 0131828312
Dewey Decimal Number: 652.8
EAN: 9780131828315
ASIN: 0131828312
Publication Date: May 26, 2004
Availability: Usually ships in 1-2 business days
Condition: Fast, reliable delivery. Exceptional customer service. May contain some highlighting. Original supplements not guaranteed. Standard shipping is USPS. Expedited shipping is UPS Ground. Expedited shipping will NOT deliver to HI, AK, PR, PO Boxes, APO/FPO.
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| Customer Reviews:
use hashing instead of a full cipher, if possible June 19, 2006
4 out of 4 found this review helpful
[For some strange reason, in the 2 years since this book was published, there are no reviews of it?!]
Spillman makes the good point early in this book that cryptology is not restricted to the current computer era. Prior to computers, many ingenious classical schemes were devised. And the successful cryptographer had to develop an intuition without the aid of a fast computer by her side. Accordingly, Spillman splits his narrative into 3 parts. The first is on classical methods, starting with the Caesar cipher. All these could and were first done without computers.
The second part involves only computer-based ciphers. Notably the public key systems first and still foremost embodied by RSA. He also goes into important related ideas like one way hash functions; explaining the 2 most important, MD5 and SHA-1. Readers should note carefully that if they are faced with a problem where hashing is adequate, instead of needed a full encrypt and decrypt cipher, then they should use hashing. It is far simpler, since it does not involve issues of key management and revocation. And hashing is usually quicker than a full cipher, which is another important advantage.
The last part of the book is rather speculative. It discusses possible future ciphers. Basically, it is about quantum computing. A fundamentally different worldview. The possibilities for vastly more powerful deciphering are explained as a parallel search through a quantum phase space, producing a plaintext observable. However, the current state of achievable lab results is very primitive. Essentially amounting to being able to factor a small number. There are severe problems with quantum decoherence that experimentalists are struggling with. This portion of the book can be read purely as precautionary, at least for the near future. Just something to keep an eye on.
Also worth noting is that the book comes with a CD of custom code. This is called CAP by the book. A program that lets you encipher and decipher text that you can input. The user interface is minimalist, but that is all that is needed. There is a choice of ciphers, as described in the book. Neat way to avoid some of the tedious low level computational steps. It lets you concentrate on understanding a cipher at a higher level, in a modular or object oriented approach. Plus, for those of you who actually dig this field, CAP is fun to play with, while still being extremely educational.
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