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SPOTLIGHT PUBLICATION | 27/03/2025

Episode 2: The Quantum-Safe Playbook: How Signal Protected Billions with a Lean Team

Quantum risk is a business risk—and Signal Messenger isn’t waiting for quantum computers to arrive. In this episode of Shielded: The Last Line of Cyber Defense, Johannes Lintzen welcomes Rolfe Schmidt, Research Engineer at Signal Messenger, to explore how one of the world's most privacy-focused messaging platforms implemented post-quantum cryptography—even with a lean team.

Formal Verification – why does it matter for PQC?

Formal verification has become increasingly important in the realm of cryptographic primitives, which serve as the foundational elements of secure communication systems. As cryptographic algorithms underpin the confidentiality, integrity, and authenticity of digital information, any flaw in their implementation can lead to catastrophic security breaches.

Episode 1: Inside Cloudflare’s Post-Quantum Journey: Bas Westerbaan on Real-World Implementation

Is your organization truly prepared for the post-quantum era? In the premier episode of Shielded: The Last Line of Cyber Defense, host Johannes Lintzen is joined by Bas Westerbaan, Research Engineer at Cloudflare, to discuss why organizations must act now on post-quantum cryptography, how to navigate the two-phase migration process, and how to overcome key management, compliance, and performance challenges.

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Unifying Leakage Models on a Rényi Day

In this work, we provide new strategies to prove the security of masked implementations.

Exploiting Determinism in Lattice-based Signatures: Practical Fault Attacks on pqm4 Implementations of NIST Candidates

In this paper, we analyze the implementation level fault vulnerabilities of deterministic lattice-based signature schemes.

BEARZ Attack FALCON: Implementation Attacks with Countermeasures on the FALCON Signature Scheme

This research proposes the first fault attack analysis of FALCON and finds its lattice trapdoor sampler is as vulnerable to fault attacks as the GPV sampler used in alternative signature schemes.

Round5: Compact and Fast Post-quantum Public-Key Encryption

We present the ring-based configuration of the NIST submission Round5, a Ring Learning with Rounding (RLWR)- based IND-CPA secure public-key encryption scheme.

More Efficient Algorithms for the NTRU Key Generation Using the Field Norm

This work shows how to speed up key generation for NTRU-based algorithms by 100x.

Anonymous Reputation Systems Achieving Full Dynamicity from Lattices

In this work, we revisit the Anonymous Reputation Systems presented by Blömer et al. in (FC’15).

Shorter Messages and Faster Post-Quantum Encryption with Round5 on Cortex M

Round5 is a Public Key Encryption and Key Encapsulation Mechanism (KEM) based on General Learning with Rounding (GLWR), a lattice problem. We implement Round5 on Cortex M4.

Attribute-Based Signatures for Unbounded Circuits in the ROM and Efficient Instantiations from Lattices

In this work, we affirmatively close the gap between ABS schemes based on bilinear maps and lattices by constructing the first lattice-based ABS scheme for unbounded circuits in the random oracle model.