Stefan Kölbl

SPHINCS+ / SLH-DSA

Sun, 20 Oct 2019 00:00:00 +0000

SPHINCS+ is a stateless hash-based signature scheme standardized as . It is an advancement of the SPHINCS signature scheme, incorporating several improvements designed to reduce signature size.

Skinny

Sun, 20 Oct 2019 00:00:00 +0000

Skinny is a family of lightweight tweakable block ciphers designed to be competitive with the most efficient lightweight block ciphers while providing a higher level of security and flexibility through its tweakable structure. It has been standardized in ISO/IEC 18033-7.

Grover Cost Calculator

Mon, 01 Jan 0001 00:00:00 +0000

S-box Analyzer

Mon, 01 Jan 0001 00:00:00 +0000

Google's commitment to a quantum-safe future: Why PQC is Google's path forward and not QKD

Mon, 01 Dec 2025 00:00:00 +0000

From Inventory to Agility: A CISO's Guide to Robust Key Management

Wed, 23 Apr 2025 00:00:00 +0000

Cryptographic Agility and Key Rotation

Mon, 24 Jun 2024 00:00:00 +0000

Why Hybrid Deployments Are Key to Secure PQC Migration

Tue, 21 May 2024 00:00:00 +0000

A note on SPHINCS+ parameter sets

Thu, 11 Apr 2024 00:00:00 +0000

Google's Threat model for Post-Quantum Cryptography

Mon, 11 Mar 2024 00:00:00 +0000

Example Talk: Recent Work

Mon, 01 Jan 2024 00:00:00 +0000

Example Talk

Dr. Alex Johnson · Meta AI

Research Overview

Multimodal LLMs
Efficient training
Responsible AI

Code & Math

def score(x: int) -> int:
    return x * x

$$ E = mc^2 $$

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95% accuracy
10x faster inference
Lower memory usage

Breakthrough!

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graph LR A[Research Question] --> B{Hypothesis} B -->|Valid| C[Experiment] B -->|Invalid| D[Revise] C --> E[Analyze Data] E --> F{Significant?} F -->|Yes| G[Publish] F -->|No| D

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Research Results

Model	Accuracy	Speed	Memory
Baseline	87.3%	1.0x	2GB
Ours (v1)	92.1%	1.5x	1.8GB
Ours (v2)	95.8%	2.3x	1.2GB

Key Finding: 8.5% improvement over baseline with 40% memory reduction

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“The best way to predict the future is to invent it.”

— Alan Kay

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Thanks

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Smith, J. et al. (2024). Open Science Presentations. Nature Methods. ↩︎

Experience

Tue, 24 Oct 2023 00:00:00 +0000

Post-quantum Cryptography at Google

Tue, 13 Jun 2023 00:00:00 +0000

Crypto Agility and Post-Quantum Cryptography @ Google

Tue, 28 Mar 2023 00:00:00 +0000

Why Google now uses post-quantum cryptography for internal comms

Sat, 19 Nov 2022 00:00:00 +0000

How to Abuse and Fix Authenticated Encryption Without Key Commitment

Wed, 10 Aug 2022 00:00:00 +0000

How to Abuse and Fix Authenticated Encryption Without Key Commitment

Sun, 01 May 2022 00:00:00 +0000

CryptoSMT

Sun, 20 Oct 2019 00:00:00 +0000

CryptoSMT is a tool for automating differential cryptanalysis for cryptographic primitives. It uses SMT solvers to find optimal differential trails and calculate probabilities for various block ciphers and hash functions.

Gimli

Sun, 20 Oct 2019 00:00:00 +0000

Gimli is a cryptographic permutation designed for high performance and security across a wide range of platforms. It is part of the and is integrated into for efficient cryptographic operations.

Haraka

Sun, 20 Oct 2019 00:00:00 +0000

Haraka is a high-performance hash function family specifically designed for short inputs. It leverages the AES-NI instruction set found in modern CPUs to achieve extremely high throughput, making it ideal for hash-based signature schemes like SPHINCS+.

Pyjamask

Sun, 20 Oct 2019 00:00:00 +0000

Pyjamask is a block cipher submitted to the NIST Lightweight Cryptography project. It was designed with a focus on efficient implementation in software, particularly on platforms with limited resources. A key feature of Pyjamask is its suitability for higher-order masking, providing strong resistance against side-channel attacks.

The SPHINCS+ Signature Framework

Sun, 01 Sep 2019 00:00:00 +0000

ShiftRows Alternatives for AES-like Ciphers and Optimal Cell Permutations for Midori and Skinny

Tue, 26 Mar 2019 00:00:00 +0000

ShiftRows Alternatives for AES-like Ciphers and Optimal Cell Permutations for Midori and Skinny

Wed, 05 Dec 2018 00:00:00 +0000

Mind the Gap - A Closer Look at the Security of Block Ciphers against Differential Cryptanalysis

Thu, 02 Aug 2018 00:00:00 +0000

Finding Integral Distinguishers with Ease

Wed, 01 Aug 2018 00:00:00 +0000

Post-quantum Cryptography

Mon, 07 May 2018 00:00:00 +0000

Putting Wings on SPHINCS

Tue, 01 May 2018 00:00:00 +0000

Update on the PQCrypto Project

Wed, 18 Apr 2018 00:00:00 +0000

Putting Wings on SPHINCS

Tue, 10 Apr 2018 00:00:00 +0000

How to instantiate Hash-based Signatures?

Wed, 31 Jan 2018 00:00:00 +0000

Tools for Cryptanalysis

Tue, 09 Jan 2018 00:00:00 +0000

Gimli: a cross-platform permutation

Sat, 01 Jul 2017 00:00:00 +0000

Lightweight Cryptography for the Internet of Things

Thu, 30 Mar 2017 00:00:00 +0000

Haraka v2 - efficient short-input hashing for post-quantum applications

Tue, 07 Mar 2017 00:00:00 +0000

Haraka - Efficient Short-Input Hashing for Post-Quantum Applications

Sun, 01 Jan 2017 00:00:00 +0000

A brief comparison of SIMON and SIMECK,

Wed, 21 Sep 2016 00:00:00 +0000

The SKINNY Family of Block Ciphers and its Low-Latency Variant MANTIS

Thu, 02 Jun 2016 00:00:00 +0000

Troika: a ternary cryptographic hash function

Thu, 02 Jun 2016 00:00:00 +0000

A Brief Comparison of Simon and Simeck

Wed, 01 Jun 2016 00:00:00 +0000

PQHash - Short Input Hashing

Sun, 10 Jan 2016 00:00:00 +0000

State-recovery analysis of Spritz

Tue, 01 Dec 2015 00:00:00 +0000

State-recovery Analysis of Spritz

Tue, 25 Aug 2015 00:00:00 +0000

Observations on the SIMON block cipher family

Mon, 17 Aug 2015 00:00:00 +0000

Observations on the SIMON block cipher family

Fri, 01 May 2015 00:00:00 +0000

Security of AES with a Secret S-box

Sun, 01 Feb 2015 00:00:00 +0000

Practical attacks on AES-like Cryptographic Hash Functions

Wed, 17 Sep 2014 00:00:00 +0000

Practical Attacks on AES-like Cryptographic Hash Functions

Sun, 01 Jun 2014 00:00:00 +0000

Differential Cryptanalysis of Keccak Variants

Wed, 18 Dec 2013 00:00:00 +0000

Differential Cryptanalysis of Keccak Variants

Sun, 01 Dec 2013 00:00:00 +0000

Cryptanalysis of a SHA-3 Candidate

Thu, 01 Mar 2012 00:00:00 +0000

Practical attacks on the Maelstrom-0 compression function

Fri, 10 Jun 2011 00:00:00 +0000

Practical Attacks on the Maelstrom-0 Compression Function

Wed, 01 Jun 2011 00:00:00 +0000

Stefan Kölbl

SPHINCS+ / SLH-DSA

Skinny

Grover Cost Calculator

S-box Analyzer

Google's commitment to a quantum-safe future: Why PQC is Google's path forward and not QKD

From Inventory to Agility: A CISO's Guide to Robust Key Management

Cryptographic Agility and Key Rotation

Why Hybrid Deployments Are Key to Secure PQC Migration

A note on SPHINCS+ parameter sets

Google's Threat model for Post-Quantum Cryptography

Example Talk: Recent Work

Example Talk

Dr. Alex Johnson · Meta AI

Research Overview

Code & Math

Dual Column Layout

Left Column

Right Column

Main Content (2/3 width)

Sidebar (1/3 width)

Image + Text Layout

Results

Speaker Notes

Progressive Reveals

Diagrams with Mermaid

Research Results

Custom Backgrounds

Vertical Navigation

Substep 1: Details

Substep 2: More Details

Citations & Quotes

Media: YouTube Videos

Media: All Options

Interactive Elements

Hidden Slide Demo (Inline Comment)

Thanks

Questions?

🎨 Branding Your Slides

📁 Adding Your Logo

📝 Title & Author Overlays

📄 Footer Text

🔇 Hiding Branding Per-Slide

🔇 Selective Hiding

✅ Quick Reference

🚀 Get Started

Experience

Post-quantum Cryptography at Google

Crypto Agility and Post-Quantum Cryptography @ Google

Why Google now uses post-quantum cryptography for internal comms

How to Abuse and Fix Authenticated Encryption Without Key Commitment

How to Abuse and Fix Authenticated Encryption Without Key Commitment

CryptoSMT

Gimli

Haraka

Pyjamask

The SPHINCS+ Signature Framework

ShiftRows Alternatives for AES-like Ciphers and Optimal Cell Permutations for Midori and Skinny

ShiftRows Alternatives for AES-like Ciphers and Optimal Cell Permutations for Midori and Skinny

Mind the Gap - A Closer Look at the Security of Block Ciphers against Differential Cryptanalysis

Finding Integral Distinguishers with Ease

Post-quantum Cryptography

Putting Wings on SPHINCS

Update on the PQCrypto Project

Putting Wings on SPHINCS

How to instantiate Hash-based Signatures?

Tools for Cryptanalysis

Gimli: a cross-platform permutation

Lightweight Cryptography for the Internet of Things

Haraka v2 - efficient short-input hashing for post-quantum applications

Haraka - Efficient Short-Input Hashing for Post-Quantum Applications

A brief comparison of SIMON and SIMECK,

The SKINNY Family of Block Ciphers and its Low-Latency Variant MANTIS

Troika: a ternary cryptographic hash function

A Brief Comparison of Simon and Simeck

PQHash - Short Input Hashing

State-recovery analysis of Spritz

State-recovery Analysis of Spritz

Observations on the SIMON block cipher family

Observations on the SIMON block cipher family