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Product details
File Size: 30697 KB
Print Length: 417 pages
Publisher: McGraw-Hill Education; 1 edition (October 9, 2015)
Publication Date: October 9, 2015
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B015YTKTZ2
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Amazon Best Sellers Rank:
#473,706 Paid in Kindle Store (See Top 100 Paid in Kindle Store)
I found this book to be, by far, the most accessible, clear and useful book on encryption that I've read in the last ten years. Obviously, this is not a book intended for cryptographers or people looking to implement cryptographic methods. Also, the author points out, from time to time, that he is determined *not* to provide rigorous proofs since this is not a maths text. All of that said, the examples are clear, the development is very logical and the explanations are extremely accessible.Writing as someone with 30+ years in IT and 20+ years in information security, I can say that I wholeheartedly recommend this book.---------------Update:Well, I have to update my review. While I still feel that the book is very valuable, a closer reading of the material covering the foundational mathematics contains errors. Some of these are easy to excuse, others are misleading, some are confusing and a few are just wrong. Still a good book, but you should be prepared to go and verify the mathematics principles that are discussed.
This is an incredible book. There are some typos and a few errors that my instructor made us aware of that are rather disappointing (very few, but considering the overall quality of the book, those typos/errors kind of let you down and make you wonder if the editors were drunk once in a while).
I dislike that I can't read it on my PC.....so I can't read it. Kindle app doesn't work on PC.
This book contains a lot of material regurgitated from more authoritative sources, much of which the author apparently doesn't understand even at a basic level. For example, on p. 324, after discussing the "birthday problem" in probability, the author goes on to apply the formula to a brute-force search for a symmetric encryption key, stating that a 50% probability of finding the right key can be obtained by searching approximately the square root of the total number of possible keys. In other words, he takes the mathematical concept he has just "explained" to the reader, and applies it in a completely inappropriate setting (the correct answer: to obtain a 50% probability of finding the right key, one must try half the possible keys).It is simply astounding that someone who wants to teach newcomers the basic mathematics of cryptography could fail to understand the difference between the probabilities involved in finding collisions for hash functions vs. the probabilities involved in a brute-force key search. A gaffe of this magnitude is simply inexcusable in a book with "applied mathematics" in the subtitle. Not only is the book not teaching the readers anything -- it is doing them a disservice.Another egregious example can be found on p. 108, where the author introduces the P vs. NP problem:"many problems in mathematics are solvable via some polynomial equation, though not all problems are solvable in this fashion. Those that are not solvable are referred to as NP, or not polynomial (also known as nondeterministic polynomial time or not solvable in polynomial time). In complexity theory, NP-complete (NP-C) problems are the most difficult problems to solve because there are no polynomial equations for their solutions".The above is wrong and confused, beginning with the author's inability to distinguish between the concepts of "solvable via polynomial equations" vs. "solvable in polynomial time". This is another instance where the author decides to tackle a subject he is clearly not familiar with. NP does not mean "not polynomial" (NP includes all polynomial-time problems) and a simple Wikipedia lookup will uncover further misconceptions in the section on P vs. NP (for example, solutions to NP-complete problems can, like all problems in NP, be verified in polynomial time -- contrary to this book's claim that they "simply cannot be addressed in any way in polynomial time"). The entire section is an incoherent mess, and sure to leave novice readers more misinformed about the subject than they were at the outset.Without belaboring the point with further examples (of which there are many), the author demonstrates a weak grasp of fundamental concepts whenever he attempts to venture beyond mere repetition of information that is covered better, and in more detail, in other sources. He should not be considered a credible authority on the subject, and there are much better options for an introductory cryptography book.
My husband purchased this book at Barnes and Noble. Here is his review:I have at this point in time finished part one of the book and will continue to explore the rest of the book at a leisurely pace. It seems to provide just enough information. The book also gives some insight into why and how we need these applications in our modern world (all the technology we need to protect) . There are a great deal of typos in the mathematical sections. If you take your time to study the math section, outside of this text book version, you should still be able to still learn the concepts that are important in this field. When I finish this text, I hope my final opinion towRds this book will change towards and I will be able to give it more stars. Read it and judge it for yourself.
Following along with pencil and paper one is disappointed quickly (page 7) both by incorrect notation (misplaced parentheses, which serve to befuddle rather than clarify) and an example that does not decrypt. This is in the section on affine ciphers (should be the easy material): the author incorrectly states, "You could obviously use any shift amount you want, as well as any multiplier." The user is then presented with a short text phrase whose ciphertext cannot be decrypted. Some quick research elsewhere reveals that there are a couple of errors involved: the multiplier must be selected to be co-prime with the size of the alphabet, and the alphabet should be mapped to nonnegative integers starting at zero rather than one (this also eliminates the author's weird acceptance of non-letter zero as the substitution for 'K'). Had the author attempted to reverse the encryption in the printed example he would have quickly found his error; besides, by simple inspection it can be seen that the letters 'A' and 'N' in the source text both encrypt to 'F' (which is invalid, as decryption is performed on each individual character -- there is no way to get back to the original message).These findings suggest that the author is not an authority on the material, and casts doubt on the correctness of successive topics. One could probably learn quite a lot about cryptography by diving into a fact-checking verification exercise for other text in the book, but the early impression is that one cannot directly learn the material from the text itself.This is a shame because the book's approach described in the Introduction sounded so promising.
Very good reading book !!
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