International Association for Cryptologic Research

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21:17 [Job][New] Tenure-Track Staff Member, CWI Amsterdam, NL, Europe

  CWI Amsterdam is looking for an excellent researcher in the area of cyber security, particularly the interface between mathematical cryptology and applied information security.

You have an excellent international research track record in cryptanalysis, with expertise in areas such as cryptographic hash functions, symmetric-key cryptography and side-channel attacks. Besides, you have broad scientific knowledge in cryptology, both in its theoretical, mathematical foundations as well as in its practical aspects, including design of algorithms, development of software, high-performance computing, industry standards and/or commercial products. You have a proven interest in applications of cryptology to practical information security (such as internet security) and you are willing to initiate or participate in research projects that relate to the Dutch cyber security policy.

As a researcher at CWI Amsterdam you are expected to perform fundamental and application-oriented research, to supervise Ph.D. students, to participate in or lead research projects together with other academic institutes or industry, and to acquire external funding. You are able to work as an independent researcher who can set his/her own research agenda, as demonstrated by previous post-doctoral work experience. You can connect to current research at CWI while at the same time bringing in substantial new expertise.

The Cryptology group operates on the interface between mathematics and computer science and

is currently focused on public-key cryptology, secure multi-party computation, quantum information theory and -cryptography, cryptanalysis and mathematical cryptology at large.

The group is affiliated with the Dutch mathematics research cluster “Discrete, Interactive and Algorithmic Mathematics, Algebra and Number Theory” (DIAMANT).

For more information about CWI, requirements, terms and conditions and how to apply, please vi

09:17 [Pub][ePrint] Expressive Attribute-Based Encryption with Constant-Size Ciphertexts from the Decisional Linear Assumption, by Katsuyuki Takashima

  We propose a key-policy attribute-based encryption (KP-ABE) scheme with constant-size ciphertexts, whose (selective) security is proven under the decisional linear (DLIN) assumption in the standard model. The access structure is expressive, that is given by non-monotone span programs. It also has fast decryption, i.e., a decryption includes only a constant number of pairing operations. As an application of our KP-ABE construction, we also propose a fully secure attribute-based signatures with constant-size secret (signing) key from the DLIN assumption. For achieving the above results, we employ a hierarchical reduction technique on dual pairing vector spaces (DPVS), where a high-level problem given on DPVS is used for proving the scheme security and then the security of the problem is reduced to that of the DLIN problem.

21:37 [Event][New] FDTC'14: Workshop on Fault Diagnosis and Tolerance in Cryptography 2014

  Submission: 23 May 2014
Notification: 27 June 2014
From September 23 to September 23
Location: Busan, Korea
More Information:

15:17 [Pub][ePrint] ChipWhisperer: An Open-Source Platform for Hardware Embedded Security Research, by Colin O\'Flynn and Zhizhang (David) Chen

  This paper introduces a complete side channel analysis toolbox, inclusive of the analog capture hardware, target device, capture software, and analysis software. The highly modular design allows use of the hardware and software with a variety of existing systems. The hardware uses a synchronous capture method which greatly reduces the required sample rate, while also reducing the data storage requirement, and improving synchronization of traces. The synchronous nature of the hardware lends itself to fault injection, and a module to generate glitches of programmable width is also provided. The entire design (hardware and software) is open-source, and maintained in a publicly available repository. Several long example capture traces are provided for researchers looking to evaluate standard cryptographic implementations.

15:17 [Pub][ePrint] Unified Oblivious-RAM: Improving Recursive ORAM with Locality and Pseudorandomness, by Ling Ren, Christopher Fletcher, Xiangyao Yu, Albert Kwon, Marten van Dijk, Srinivas Devadas

  Oblivious RAM (ORAM) is a cryptographic primitive that hides memory access patterns to untrusted storage. ORAM may be used in secure processors for encrypted computation and/or software protection. While recursive Path ORAM is currently the most practical ORAM for secure processors, it still incurs large performance and energy overhead and is the performance bottleneck of recently proposed secure processors.

In this paper, we propose two optimizations to recursive Path ORAM.

First, we identify a type of program locality in its operations to improve performance. Second, we use pseudorandom function to compress the position map. But applying these two techniques in recursive Path ORAM breaks ORAM security. To securely take advantage of the two ideas, we propose unified ORAM. Unified ORAM improves performance both asymptotically and empirically. Empirically, our experiments show that unified ORAM reduces data movement from ORAM by half and improves benchmark performance by 61% as compared to recursive Path ORAM.

15:17 [Pub][ePrint]


22:31 [Event][New]


22:30 [Event][New] Crypto: Crypto 2016 (tentative)

  From August 14 to August 18
Location: Santa Barbara, USA
More Information:

22:30 [Event][New] Crypto: Crypto 2017 (tentative)

  From August 20 to August 24
Location: Santa Barbara, USA
More Information:

22:30 [Event][New] Crypto: Crypto 2018 (tentative)

  From August 19 to August 23
Location: Santa Barbara, USA
More Information:

20:50 [PhD][Update] Diego F. Aranha: Efficient software implementation of elliptic curves and bilinear pairings

  Name: Diego F. Aranha
Topic: Efficient software implementation of elliptic curves and bilinear pairings


The development of asymmetric or public key cryptography made possible new applications of cryptography such as digital signatures and electronic commerce. Cryptography is now a vital component for providing confidentiality and authentication in communication infra-structures. Elliptic Curve Cryptography is among the most efficient public-key methods because of its low storage and computational requirements. The relatively recent advent of Pairing-Based Cryptography allowed the further construction of flexible and innovative cryptographic solutions like Identity-Based Cryptography and variants. However, the computational cost of pairing-based cryptosystems remains significantly higher than traditional public key cryptosystems and thus an important obstacle for adoption, specially in resource-constrained devices.

The main contributions of this work aim to improve the performance of curve-based cryptosystems, consisting of:
(i) efficient implementation of binary fields in 8-bit microcontrollers embedded in sensor network nodes;
(ii) efficient formulation of binary field arithmetic in terms of vector instructions present in 64-bit architectures, and on the recently-introduced native support for binary field multiplication in the latest Intel microarchitecture families;
(iii) techniques for serial and parallel implementation of binary elliptic curves and symmetric and asymmetric pairings defined over prime and binary fields.
These contributions produced important performance improvements and, consequently, several speed records for computing relevant cryptographic algorithms in modern computer architectures ranging from embedded 8-bit microcontrollers to 8-core processors.