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Applied Cryptography and Network Security: 12th by Ioana Boureanu, Philippe Owesarski, Serge Vaudenay

By Ioana Boureanu, Philippe Owesarski, Serge Vaudenay

This e-book constitutes the refereed complaints of the twelfth foreign convention on utilized Cryptography and community protection, ACNS 2014, held in Lausanne, Switzerland, in June 2014. The 33 revised complete papers integrated during this quantity have been rigorously reviewed and chosen from 147 submissions. they're equipped in topical sections on key alternate; primitive development; assaults (public-key cryptography); hashing; cryptanalysis and assaults (symmetric cryptography); community safety; signatures; process defense; and safe computation.

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Additional info for Applied Cryptography and Network Security: 12th International Conference, ACNS 2014, Lausanne, Switzerland, June 10-13, 2014. Proceedings

Sample text

Our Results. In this paper, we give a three-move PAKE scheme that is secure without assuming both ideal primitives and a (centralized) trusted setup. Naturally, the most desirable goal is to construct a practical PAKE scheme in the plain model. However, we have a lot of hurdles to get an efficient construction in the plain model, even for getting constant round. Thus, this paper aims to avoid the drawback of the CRS model as a milestone toward a practical PAKE scheme in the plain model. Our key idea is to adopt the multi-string (MS) model [21].

If π is invalid, A aborts. Otherwise, A derives ˆ = Enclabel rA ||τA ||S KA = hhp (pk , CT , pw, r ), computes the ciphertext CT pk (pw; rA ), and ˆ checks whether CT CT . If so, A aborts. Otherwise, A sends τA to B and outputs the session key S KA . Upon receiving τA , B checks whether τA τB . If so, B aborts. Otherwise, B outputs the session key S KB . Correctness. When both parties A and B have the common password, the session keys that they compute are the same. This is because the same hash value is obtained when using the hash key hk and when using the projection key hp.

B Meanwhile, B sets T1B := TKE || A || B and computes NB := CRHF(T1B ). Enc(pkA , KB || NB ) under A’s public key pkA . B B , B sets T2B := T1B || CA || CB and com3. Upon receiving the ciphertext CA B B B B putes RB := CRHF(T2 ). e. Dec(skB , New Modular Compilers for Authenticated Key Exchange 17 B CA )). Then B checks whether NAB = NB . If the check is not passed, then B B rejects. Tag(KA , “2” || RB ) and transmits (MB , CB ) to A. A A ), A sets T2A := T1A || CA || CB and 4. Upon receiving messages (MBA , CB A A computes RA := CRHF(T2 ).

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