Research Papers

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Exploring Parallelism to Improve the Performance of FrodoKEM in Hardware

FrodoKEM is a lattice-based key encapsulation mechanism, currently a semi-finalist in NIST’s post-quantum standardisation effort.

Scalable Ciphertext Compression Techniques for Post-quantum KEMs and Their Applications

A multi-recipient key encapsulation mechanism, or mKEM, provides a scalable solution to securely communicating to a large group.

The design of scalar AES Instruction Set Extensions for RISC-V

We survey the state-of-the-art industrial and academic ISEs for AES, implement and evaluate five different ISEs, one of which is novel.

Building a Modern TRNG: An Entropy Source Interface for RISC-V

The currently proposed RISC-V True Random Number Generator (TRNG) architecture breaks with previous ISA TRNG practice by splitting the Entropy Source (ES) component away from cryptographic PRNGs into a separate interface, and in its use of polling. We describe the interface, its use in cryptography, and offer additional discussion, background, and rationale for various aspects of it.

ModFalcon: Compact Signatures Based On Module-NTRU Lattices

We introduce a new family of signature schemes based on the falcon design, which relies on module lattices. Our concrete instantiation enjoys the compactness and efficiency of falcon, and allows an intermediate security level.

Cryptographic Divergences: New Techniques and New Applications

In the recent years, some security proofs in cryptography have known significant improvements by replacing the statistical distance with alternative divergences.

Mobile Energy Requirements of the Upcoming NIST Post-Quantum Cryptography Standards

We present an energy requirement analysis based on extensive measurements of PQC candidate algorithms on a Cortex M4 - based reference platform.

Post-Quantum Ciphertext Compression and Applications to Secure Group Messaging

A standard method to establish secure communications between two or more parties is to encrypt a common session key via a key encapsulation mechanism (or KEM).

Secure Update Propagation via Set-Homomorphic Signatures

In this document, we propose to use homomorphic signatures to maintain a consistent database across all nodes of distributed network.

Pyjamask: Block Cipher and Authenticated Encryption with Highly Efficient Masked Implementation

This paper introduces Pyjamask, a new block cipher family and authenticated encryption proposal submitted to the NIST lightweight cryptography standardization process.

Integral Matrix Gram Root and Lattice Gaussian Sampling Without Floats

In this paper, we give techniques to implement Gaussian sampling over general lattices without using FPA. To this end, we revisit the approach of Peikert, using perturbation sampling.

Lossy CSI-FiSh: Efficient Signature Scheme with Tight Reduction to Decisional CSIDH-512

In this paper, we propose an FS-style signature scheme, called Lossy CSI-FiSh, constructed using the CSIDH-512 parameters and with a security proof.