March 29, 2017

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Extra info for Amateur Photographer 2010-12-18

Example text

A chosen message attack seeks to emulate the normal mode of use of a signature scheme, in which an attacker can observe signatures produced by a legitimate party, perhaps in some adversarially chosen way. • In a no-message attack (NMA), the oracle gives no response. This is equivalent to an attack model in which the attacker does not have access to the oracle. The attacker attempts to forge a signature. There are two ways which we can assess whether the attacker succeeds in forging a signature.

In a chosen plaintext attack (CPA), the oracle gives no response. Again, this is equivalent to an attack model in which the attacker does not have access to an oracle. 16 Y. 3 (Secure public key encryption scheme) A public key encryption scheme is said to be IND-ATK secure (where ATK∈ {CPA,CCA2}) if the advantage that an attacker has in winning the IND game with oracle access as defined in the ATK model is negligible as a function of the security parameter for all probabilistic, polynomial-time attackers.

This chapter provides a formal definition for the security of signcryption in the two-user setting and analysis of the security of signcryption schemes that are constructed by generically composing signature and encryption schemes in the publicT. J. W. Dent, Y. 1007/978-3-540-89411-7_2, C Springer-Verlag Berlin Heidelberg 2010 21 22 J. H. An and T. Rabin key setting. The first attempt to produce security models for signcryption was given by Steinfeld and Zheng [184]; however, this work only proposed a security model for the integrity protection property of a signcryption scheme.

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