Download Cryptology and Network Security: 13th International by Dimitris Gritzalis, Aggelos Kiayias, Ioannis Askoxylakis PDF

By Dimitris Gritzalis, Aggelos Kiayias, Ioannis Askoxylakis

This booklet constitutes the refereed complaints of the thirteenth overseas convention on Cryptology and community safety, CANS 2014, held in Heraklion, Creete, Greece, in October 2014. The 25 revised complete papers offered including the abstracts of three invited talks have been rigorously reviewed and chosen from 86 submissions. The papers disguise subject matters of curiosity akin to encryption; cryptanalysis; malware research; and privateness and identity platforms in addition to quite a few different types of community protocol layout and research work.

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Extra resources for Cryptology and Network Security: 13th International Conference, CANS 2014, Heraklion, Crete, Greece, October 22-24, 2014. Proceedings

Example text

Eval(K, id∗ )|. Eval(K, id∗ )} ≈ {(K , id∗ , r) : r ← − {0, 1}m)}. $ C It follows that Game 2 and Game 3 are computationally indistinguishable. Game 4: This is the same as Game 3 except that we replace the challenge ciphertext with an encryption of a random message. The adversary has a zero advantage in this game. If a PPT adversary A can distinguish between Game 3 and Game 4, then there exists a PPT adversary B that can use A to attack the IND-sID-CPA security of EFHE . When B receives the challenger’s public key pk, it sets pkid∗ ← pk where id∗ is the target identity chosen by A.

332–353. Springer, Heidelberg (2008) 18. : Unidirectional Chosen-Ciphertext Secure Proxy Re-encryption. In: Cramer, R. ) PKC 2008. LNCS, vol. 4939, pp. 360–379. Springer, Heidelberg (2008) 19. : Ciphertext Policy Attribute-Based Proxy Re-encryption. , L´opez, J. ) ICICS 2010. LNCS, vol. 6476, pp. 401–415. Springer, Heidelberg (2010) 20. : CCA-Secure Proxy Re-encryption without Pairings. , Tsudik, G. ) PKC 2009. LNCS, vol. 5443, pp. 357–376. Springer, Heidelberg (2009) 21. : Multi-Use and Unidirectional Identity-Based Proxy ReEncryption Schemes.

Dec2 (ski , Ci ) : Given a secret key ski and a 2nd level ciphertext Ci , compute ψ = H0 (c0 , c1 ) and check the relations (1). If the relations do not hold, return “⊥ . 1/x Otherwise, parse c0 = τ1 ||τ2 and compute K = e(c3 i , h2 ). If τ1 = H1 (K), return m = τ2 ⊕ H2 (K), else return “⊥ . We omit the correctness of SII due to the space limit. Theorem 3. Assume H0 is a collision-resistant hash function, H1 is a collision-resistant and one-way hash function and H2 is a universal hash function, scheme SII is CCA secure at both the 2nd level and the 1st level ciphertexts under the DBDH assumption.

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