New PDF release: Advances in Cryptology - CRYPTO 2009: 29th Annual

By Shai Halevi

ISBN-10: 3642033555

ISBN-13: 9783642033551

This booklet constitutes the refereed court cases of the twenty ninth Annual foreign Cryptology convention, CRYPTO 2009, held in Santa Barbara, CA, united states in August 2009.
The 38 revised complete papers offered have been rigorously reviewed and chosen from 213 submissions. Addressing all present foundational, theoretical and learn elements of cryptology, cryptography, and cryptanalysis in addition to complicated functions, the papers are geared up in topical sections on key leakage, hash-function cryptanalysis, privateness and anonymity, interactive proofs and zero-knowledge, block-cipher cryptanalysis, modes of operation, elliptic curves, cryptographic hardness, merkle puzzles, cryptography within the actual international, assaults on signature schemes, mystery sharing and safe computation, cryptography and game-theory, cryptography and lattices, identity-based encryption and cryptographers’ toolbox.

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Additional info for Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009, Proceedings (Lecture ... Computer Science / Security and Cryptology)

Example text

The proof is complete. 1 Find (1) 2143 (mod 13). (2) 5141 (mod 47). 2 Determine whether the following are true, and explain why. (1) If a3 ≡ b3 (mod m), then a ≡ b (mod m). (2) If a ≡ b (mod m), then a3 ≡ b3 (mod m). (3) If ac ≡ bc (mod m), then a ≡ b (mod m). (4) If a1 ≡ a2 (mod m) and b1 ≡ b2 (mod m), then (a1 )b1 ≡ (a2 )b2 (mod m). 3 Find the inverses of all elements modulo m = 7, 13, respectively. 4 Prove that for any positive integer n, at least one of the following congruences holds: n ≡ 0 (mod 2), n ≡ 3 (mod 18), n ≡ 0 (mod 3), n ≡ 1 (mod 4), n ≡ 7 (mod 12), n ≡ 23 (mod 24).

3. For any integer m, we have [x + m] = [x] + m, {x + m} = {x}. {x} is a periodic function with period 1. 4. [x] + [y] ≤ [x + y] ≤ [x] + [y] + 1 and exactly one equality holds. 5. [ − x] = −[x], x ∈ Z, −[x] − 1, x ∈ Z, {−x} = 6. For positive integer m, we have −{x} = 0, x ∈ Z, 1 − {x}, x ∈ Z. [x] x = . m m 7. The least integer that is not smaller than x is −[−x]. © 2016 by Science Press T&F Cat #K24602 — K24602 C001 — page 21 — 9/3/2015 — 21:11 22 Mathematical Foundations of Public Key Cryptography 8.

We have r1 · · · r c = −1 (mod 2l ), l = 1, 2, l ≥ 3. 1 (mod 2l ), Proof When l = 1, 2, the result can be verified directly. Now let us assume l ≥ 3. For each ri , there must be a unique rj such that r i rj ≡ 1 (mod 2l ). 5) satisfies ri = rj if and only if ri2 ≡ 1 (mod 2l ); that is, (ri − 1)(ri + 1) ≡ 0 (mod 2l ). As (ri , 2) = 1, so we have ri − 1 ri + 1 · ≡0 2 2 The fact that (mod 2l−2 ). ri − 1 r i + 1 , 2 2 =1 © 2016 by Science Press T&F Cat #K24602 — K24602 C002 — page 42 — 9/3/2015 — 21:12 Congruences 43 implies that ri = rj if and only if ri − 1 ≡0 2 (mod 2l−2 ) or ri + 1 ≡0 2 (mod 2l−2 ), that is, if and only if ri ≡ 1 (mod 2l−1 ) or ri ≡ −1 (mod 2l−1 ).

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Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009, Proceedings (Lecture ... Computer Science / Security and Cryptology) by Shai Halevi


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