By Luther Martin

In case you are seeking to absolutely comprehend and successfully enforce identity-based encryption (IBE) expertise, this authoritative source is a brilliant selection. earlier, information on IBE have merely been present in bulky, hard-to-follow magazine articles and convention court cases. this can be the 1st booklet to provide you entire, easy-to-understand information at the topic. evaluating and contrasting IBE with conventional public-key applied sciences, the publication essentially explains how and why IBE platforms are safe. you discover a wealth of useful options, algorithms and various labored examples that assist you to create a safe IBE procedure.

From uncomplicated mathematical innovations and houses, homes of elliptic curves, divisors and the Tate pairing, and cryptography and computational complexity, to similar cryptographic algorithms, numerous IBE schemes, hierarchical IBE and grasp mystery making plans, and calculating pairings, this entire quantity serves as a transparent consultant to this more and more vital safeguard expertise. This hands-on quantity comprises special pseudocode for identity-based encryption algorithms and helping algorithms that aid prevent time and simplify your tough initiatives within the box.

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Additional resources for Introduction to Identity-Based Encryption (Information Security and Privacy Series)

Example text

In this case, the real number 1 acts as the identity element. (v) ‫ ޚ‬n is a group under addition but may not be a group under multiplication; ‫ ޚ‬n is a group under multiplication if and only if n is prime. 2 is a group. In this group, every element is its own inverse. 14 If (G, *) is a group, then the number of elements in the set G is called the order of the group. This can be either finite or infinite. 15 A group (G, *) with the additional property that a * b = b * a for all a and b in G is called an Abelian group.

An elliptic curve for which the discriminant ⌬ ≠ 0 is called nonsingular. Note that an elliptic curve may be nonsingular over one field and singular over another. Note that this definition of the discriminant is always even so it is always zero in a field of characteristic 2. In this case, the Weierstrass normal form needs to be replaced with a different form for which the discriminant is not always zero. 1 (i) The elliptic curve y 2 = x 3 + x + 1 is nonsingular over the real numbers because it has discriminant ⌬ = −16(31) = −496.

6(i) tells us that −1 is a quadratic residue modulo p if p ≡ 1(mod 4) and that −1 is a quadratic nonresidue modulo p if p ≡ 3(mod 4). If −1 is a quadratic nonresidue modulo p, then we have that ͩ ͪ ͩ ͪͩ ͪ ͩ ͪ −a n = −1 a =− n n a n so that either a is a quadratic residue or −a is a quadratic residue. In particular, this is true when p ≡ 3(mod 4). 12 ͩͪ ͩͪ ͩͪ ͩͪ 6 = 0 because 3 divides 6 3 3 = 3(7 − 1)/2 = 33 = 27 ≡ −1 (mod 7) (ii) 7 (iii) Because 3 and 7 are both congruent to 3 modulo 4, we have that 7 3 =− = +1 3 7 (i) We can generalize the definition of Legendre symbols to get Jacobi symbols, which are defined for composite denominators as follows.

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