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Sponges Resist Leakage: The Case of Authenticated Encryption
AEAD Leakage Resilience Side Channels
2019/9/17
In this work we advance the study of leakage-resilient Authenticated Encryption with Associated Data (AEAD) and lay the theoretical groundwork for building such schemes from sponges. Building on the w...
Simultaneous Amplification: The Case of Non-Interactive Zero-Knowledge
NIZK Security Amplification
2019/6/4
We develop novel techniques to leverage the use of leakage simulation lemma (Jetchev-Peitzrak TCC 2014) to argue amplification. A crucial component of our result is a new notion for secret sharing NPN...
Threshold ECDSA from ECDSA Assumptions: The Multiparty Case
threshold cryptography elliptic curve cryptography multi-party computation
2019/5/21
Cryptocurrency applications have spurred a resurgence of interest in the computation of ECDSA signatures using threshold protocols---that is, protocols in which the signing key is secret-shared among ...
Pushing the speed limit of constant-time discrete Gaussian sampling. A case study on Falcon
Post-quantum signature Falcon constant-time
2019/3/6
Sampling from discrete Gaussian distribution has applications in lattice-based post-quantum cryptography. Several efficient solutions have been proposed in recent years. However, making a Gaussian sam...
China’s Strategic Partnerships in Latin America: Case Studies of China’s Oil Diplomacy in Argentina, Brazil, Mexico, and Venezuela 1991–2015
Strategic Partnerships Latin America Argentina Brazil Mexico
2019/10/11
In 2011, the Peruvian drug czar appointed by incoming President Ollanta Humala announced that U.S.-supported coca eradication was suspended in favor of locally-based alternative development and target...
How Does Strict Parallelism Affect Security? A Case Study on the Side-Channel Attacks against GPU-based Bitsliced AES Implementation
MBFFA AES Implementation
2018/11/12
Parallel cryptographic implementations are generally considered to be more advantageous than their non-parallel counterparts in mitigating side-channel attacks because of their higher noise-level. So ...
Reconsidering Generic Composition: the Tag-then-Encrypt case
Authenticated Encryption generic composition tag-then-encrypt
2018/11/5
Authenticated Encryption (AEAE) achieves confidentiality and authenticity, the two most fundamental goals of cryptography, in a single scheme. A common strategy to obtain AEAE is to combine a Message ...
Key Extraction using Thermal Laser Stimulation: A Case Study on Xilinx Ultrascale FPGAs
TLS FPGA
2018/8/2
Thermal laser stimulation (TLS) is a failure analysis technique, which can be deployed by an adversary to localize and read out stored secrets in the SRAM of a chip. To this date, a few proof-of-conce...
Side-Channel Analysis of SM2: A Late-Stage Featurization Case Study
applied cryptography public-key cryptography side-channel analysis
2018/7/9
SM2 is a public key cryptography suite originating from Chinese standards, including digital signatures and public key encryption. Ahead of schedule, code for this functionality was recently mainlined...
CHQS: Publicly Verifiable Homomorphic Signatures Beyond the Linear Case
Delegated Computation Homomorphic Signatures Context-Hiding
2018/6/19
Sensitive data is often outsourced to cloud servers, with the server performing computation on the data. Computational correctness must be efficiently verifiable by a third party while the input data ...
We give Proofs of Work (PoWs) whose hardness is based on well-studied worst-case assumptions from fine-grained complexity theory. This extends the work of (Ball et al., STOC '17), that presents PoWs t...
Learning strikes again: the case of the DRS signature scheme
Cryptanalysis Lattice based signature Statistical attack
2018/3/29
Lattice signature schemes generally require particular care when it comes to preventing secret information from leaking through signature transcript. For example, the Goldreich-Goldwasser-Halevi (GGH)...
Worst-Case Hardness for LPN and Cryptographic Hashing via Code Smoothing
LPN Worst-Case to Average Case Reductions Collision-Resistant Hashing
2018/3/23
We present a worst case decoding problem whose hardness reduces to that of solving the Learning Parity with Noise (LPN) problem, in some parameter regime. Prior to this work, no worst case hardness re...
Threshold Implementation in Software - Case Study of PRESENT
Side-Channel Analysis Boolean masking Threshold Implementation
2018/3/6
Masking is one of the predominantly deployed countermeasures in order to prevent side-channel analysis (SCA) attacks. Over the years, various masking schemes have been proposed. However, the implement...
Doing Real Work with FHE: The Case of Logistic Regression
Homomorphic Encryption Implementation Logistic Regression
2018/3/5
We describe our recent experience, building a system that uses fully-homomorphic encryption (FHE) to approximate the coefficients of a logistic-regression model, built from genomic data. The aim of th...