NDLI: Key-dependent Message Security under Active Attacks--BRSIM/UC-Soundness of Symbolic Encryption with Key Cycles

Content Provider	IEEE Xplore Digital Library
Author	Backes, M. Pfitzmann, B. Scedrov, A.
Copyright Year	2007
Description	Author affiliation: Saarland Univ., Saarbrucken (Backes, M.)
Abstract	Key-dependent message security, short KDM security, was introduced by Black, Rogaway and Shrimpton to address the case where key cycles occur among encryptions, e.g., a key is encrypted with itself. It was mainly motivated by key cycles in Dolev-Yao models, i.e., symbolic abstractions of cryptography by term algebras, and a corresponding soundness result was later shown by Adao et al. However, both the KDM definition and this soundness result do not allow the general active attacks typical for Dolev-Yao models and for security protocols in general. We extend these definitions so that we can obtain a soundness result under active attacks.We first present a definition AKDM as a KDM equivalent of authenticated symmetric encryption, i.e., it provides chosen-ciphertext security and integrity of ciphertexts even for key cycles. However, this is not yet sufficient for the desired soundness, and thus we give a definition DKDM that additionally allows limited dynamic revelation of keys.We show that this is sufficient for soundness, even in the strong sense of blackbox reactive simulatability (BRSIM)/UC and including joint terms with other operators. We also present constructions of schemes secure under the new definitions, based on current KDM-secure schemes. Moreover, we explore the relations between the new definitions and existing ones for symmetric encryption in detail, in the sense of implications or separating examples for almost all cases.
Starting Page	112
Ending Page	124
File Size	327753
Page Count	13
File Format	PDF
ISBN	0769528198
ISSN	19401434
DOI	10.1109/CSF.2007.23
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-06
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Algebra Information security Public key Concrete Cryptography Computer security Message authentication Cryptographic protocols
Content Type	Text
Resource Type	Article

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