Download E-books Public-Key Cryptography -- PKC 2014: 17th International Conference on Practice and Theory in Public-Key Cryptography, Buenos Aires, Argentina, March ... Computer Science / Security and Cryptology) PDF

This ebook constitutes the refereed complaints of the seventeenth foreign convention on perform and thought in Public-Key Cryptography, PKC 2014, held in Buenos Aires, Argentina, in March 2014. The 38 papers provided have been conscientiously reviewed and chosen from one hundred forty five submissions. The papers are prepared in topical sections on selected ciphertext safeguard, re-encryption, verifiable outsourcing, cryptanalysis, id and attribute-based encryption, more advantageous encryption, signature schemes, related-key safeguard, useful authentication, quantum impossibility, privateness, protocols.

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Developing re-encryption schemes. Hohenberger et al. [25] (and additionally independently Hofheinz et al. [24]) brought the suggestion of average-case safe obfuscation, which has been the traditional definition of obfuscation in those works; it captures the concept that the obfuscated software finds not anything to an adversary while the linked encryption secret's selected at random and unknown to the adversary. The paintings of Hohenberger et al. [25] confirmed tips to securely obfuscate the re-encryption performance lower than this definition assuming a bilinear pairing. within the curiosity of basing primitives on various assumptions, it's typical to invite: do we build a safe obfuscator for the reencryption performance in keeping with different kinds of assumptions? additionally, their scheme has the predicament that the enter and output encryption schemes are diverse, in different phrases, this system takes as enter ciphertexts lower than one encryption scheme and outputs ciphertexts lower than not only a unique key yet a unique scheme. whereas this can be all right in yes eventualities, many purposes (e. g. multi-hop re-encryption) require enter and output schemes to have an analogous constitution to permit for cascading, i. e. taking a re-encrypted ciphertext and re-encrypting it back. As famous in [15] the re-encryption performance may be securely discovered given any absolutely homomorphic encryption (FHE) scheme [28, 15]; the re-encryption secret is easily Kpk→pk = Encpk (sk) and the re-encryption software, on enter c = Encpk (m), computes Encpk (c) after which Evalevk (f, c, Kpk→pk ), the place f is the decryption circuit, to Re-encryption, useful Re-encryption, and Multi-hop Re-encryption ninety seven receive Encpk (m). (This may be generalized to accomplish basically any performance with encrypted output. ) we all know buildings of FHE in line with numerous lattice-based assumptions [15, sixteen, eleven, 10, 17, nine, 8], so this is able to provide lattice-based structures for re-encryption. There are despite the fact that concerns with this process: First, FHE is a truly powerful primitive, and regardless of major development, it's nonetheless very dear; preferably developing an easy performance like re-encryption usually are not require such heavyweight instruments. extra importantly, by way of the definition of correctness of application obfuscation, a safe obfuscator for the re-encryption performance needs to output ciphertexts that experience a distribution that's statistically just about the distribution output via the fitting re-encryption circuit for all inputs. specifically, this statistical closeness needs to carry even for invalid ciphertexts. the single means we all know to accomplish this type of distribution is thru bootstrapping [15], that is the main computationally pricey a part of the FHE structures (and no longer integrated the extra effective a bit of homomorphic encryption (SHE) schemes). demanding situations in lattice dependent structures. hence one may well ask, what approximately less complicated lattice-based structures? extra concretely, will we in attaining an obfuscation-based concept of re-encryption with no bootstrapping?

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