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result is so far the best outcome. It can be assumed that hardware implementations of ZUC following our architecture will fit in future LTE equipments better
We complement these latter works in several ways. First, we show that any simulator satisfying the reset indifferentiability notion must be stateless and pseudo-deterministic. Using this characterization we show that, with respect to reset indifferentiability, two ideal models are either equivalent or incomparable, that is, a model cannot be strictly stronger than the other model. In the case of the random oracle model and the ideal cipher model, this implies that the two are incomparable. Finally, we examine weaker notions of reset indifferentiability that, while not being able to allow composition in general, allow composition for a large class of multi-stage games. Here we show that the seemingly much weaker notion of 1-reset indifferentiability proposed by Luykx et al. is equivalent to reset indifferentiability. Hence, the impossibility of coming up with a reset indifferentiable construction transfers to the setting where only one reset is permitted, thereby re-opening the quest for an achievable and meaningful notion in between the two variants.
- Analysis of “real world” protocols
- Formal Methods applied to security protocols
- Fully Homomorphic Encryption
- Lattice Based Cryptography
- Provable Security, i.e. Protocol and Mechanism design
- Multi-Party Computation
You will hold a PhD, or expect to be awarded soon, and have experience in one of the sub-areas of cryptography mentioned above.
You will have a good level of analytical skills and the ability to communicate complex information clearly, both orally and through the written word together with the ability to use personal initiative, and creativity, to solve problems encountered in the research context.
Ideally, you will also have a strong publication record in top relevant venues, such as the IACR conferences and journal, ACM-CCS, IEEE S&P, ESORICS, etc
Appointment may be made at the Research Assistant (grade I) or Research Associate (grade J) level depending on skills and experience and will be for 2 to 3 years in the first instance.
We are looking for a postdoctoral researcher to participate in Project CATREL (theoretical and practical improvements for algorithms for breaking discrete logarithms over finite fields). This two-year position is with the GRACE team at the École polytechnique (in the southern suburbs of Paris), starting no later than January 1, 2014.
For more information, see
Candidates should have a PhD in number theory or computer science.
Good programming skills and knowledge of number theory are essential; experience in C/C++ development, algorithmic number theory, and computer algebra systems (such as Magma, Sage, Pari-GP, etc) would be an advantage.
In this paper we provide techniques for bypassing the perceived limitations of deduction soundness and demonstrate that it enjoys vastly improved composition properties. More precisely, we show that a deduction sound implementation can be modularly extended with all of the basic cryptographic primitives (symmetric/asymmetric encryption, message authentication codes, digital signatures, and hash functions). We thus obtain the first soundness framework that allows for the joint use of multiple instances of all of the basic primitives.
In addition, we show how to overcome an important restriction of the bare deduction soundness framework which forbids sending encrypted secret keys. In turn, this prevents its use for the analysis of a large class of interesting protocols (e.g. key exchange protocols). We allow for more liberal uses of keys as long as they are hidden in a sense that we also define. All primitives typically used to send secret data (symmetric/asymmetric encryption) satisfy our requirement which we also show to be preserved under composition.
More concretely, part of the research will involve the analysis and development of authentication protocols in specific settings. This will include investigating resistance of both existing and novel protocols against different types of attacks, theoretically and experimentally. In addition to investigating established settings, such as RFID authentication, the research will also explore more general authentication problems, such as those that arise in the context of trust in social networks, smartphone applications and collaborative data processing. This will be done by grounding the work in a generalised decision-making framework. The project should result in the development of theory and authentication mechanisms for noisy, constrained settings that strike an optimal balance between reliable authentication, privacy-preservation and resource consumption. Some previous research related to this research project can be found here: http://lasecwww.epfl.ch/~katerina/Publications.html
Applicants for the position shall have a Master’s Degree or corresponding in Computer Science, Informatics, Telecommunications or in a related discipline. A master\\\'s degree in information security or cryptography is a bonus.
to apply indistinguishability obfuscation towards cryptographic
problems. We use this technique to carry out a systematic study of
the applicability of indistinguishability obfuscation to a variety of
cryptographic goals. Along the way, we resolve the 16-year-old open
question of Deniable Encryption, posed by Canetti, Dwork, Naor,
and Ostrovsky in 1997: In deniable encryption, a sender who is forced
to reveal to an adversary both her message and the randomness she used
for encrypting it should be able to convincingly provide ``fake\'\'
randomness that can explain any alternative message that she would
like to pretend that she sent. We resolve this question by giving the
first construction of deniable encryption that does not require
any pre-planning by the party that must later issue a denial.
In addition, we show the generality of our punctured programs
technique by also constructing a variety of core cryptographic objects
from indistinguishability obfuscation and one-way functions (or close
variants). In particular we obtain: public key encryption, short
``hash-and-sign\'\' selectively secure signatures, chosen-ciphertext
secure public key encryption, non-interactive zero knowledge proofs
(NIZKs), injective trapdoor functions, and oblivious transfer. These
results suggest the possibility of indistinguishability
obfuscation becoming a ``central hub\'\' for cryptography.