Read e-book online An Introduction to Mathematical Cryptography PDF

By Jeffrey Hoffstein, Jill Pipher, Joseph H. Silverman

ISBN-10: 0387779930

ISBN-13: 9780387779935

ISBN-10: 0387779949

ISBN-13: 9780387779942

An advent to Mathematical Cryptography presents an creation to public key cryptography and underlying arithmetic that's required for the topic. all the 8 chapters expands on a particular region of mathematical cryptography and gives an intensive checklist of exercises.

It is an appropriate textual content for complicated scholars in natural and utilized arithmetic and desktop technological know-how, or the ebook can be used as a self-study. This publication additionally presents a self-contained remedy of mathematical cryptography for the reader with constrained mathematical background.

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Extra resources for An Introduction to Mathematical Cryptography

Example text

Eventually, we get to rt = a · u + b · v for some integers u and v. But rt = gcd(a, b), which completes the proof of the first part of the theorem. 11). An especially important case of the extended Euclidean algorithm arises when the greatest common divisor of a and b is 1. In this case we give a and b a special name. Definition. Let a and b be integers. We say that a and b are relatively prime if gcd(a, b) = 1. More generally, any equation Au + Bv = gcd(A, B) can be reduced to the case of relatively prime numbers by dividing both sides by gcd(A, B).

Given any list of integers j1 , j2 , . . , jn and given all of the values R(k, j1 ), R(k, j2 ), . . , R(k, jn ), it is hard to guess the value of R(k, j) with better than a 50% chance of success for any value of j not already in the list.

We can restate this observation by saying that a6 ≡ 1 (mod 7) for every a = 1, 2, 3, . . , 6. Of course, this cannot be true for all values of a, since if a is a multiple of 7, then so are all of its powers, so in that case an ≡ 0 (mod 7). On the other hand, if a is not divisible by 7, then a is congruent to one of the values 1, 2, 3, . . , 6 modulo 7. Hence a6 ≡ 1 0 (mod 7) (mod 7) if 7 a, if 7 | a. Further experiments with other primes suggest that this example reflects a general fact. 25 (Fermat’s Little Theorem).

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An Introduction to Mathematical Cryptography by Jeffrey Hoffstein, Jill Pipher, Joseph H. Silverman


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