Dr Rachel Player

Lecturer in Information Security

About Me

Hi! My name is Dr Rachel Player and I’m a lecturer in the Department of Information Security at Royal Holloway, University of London. Previously, I was a postdoc in the same team working as part of the EU H2020 PROMETHEUS project on lattice-based cryptography. In January - May 2019, I was a visiting researcher in the PolSys team of LIP6 at Sorbonne Université in Paris. In 2018, I held a one-year postdoc position in the same team. Before that, I was a PhD student at Royal Holloway.

My main research interests are post-quantum cryptography, especially lattice-based cryptography, and homomorphic encryption. I am also interested in the application of quantum algorithms in cryptanalysis.

I was recently honoured by Internet Security Research Group with The Radiant Award for Advancing Internet Security!

Publications

On the Feasibility and Impact of Standardising Sparse-secret LWE Parameter Sets for Homomorphic Encryption

Benjamin R. Curtis, Rachel Player. WAHC 2019 – 7th Workshop on Encrypted Computing & Applied Homomorphic Cryptography, to appear.

Discretisation and Product Distributions in Ring-LWE

Sean Murphy, Rachel Player. MathCrypt 2019, to appear.

Homomorphic noise growth in practice: comparing BGV and FV

Anamaria Costache, Kim Laine, Rachel Player. Preprint.

A Central Limit Framework for Ring-LWE Decryption

Sean Murphy, Rachel Player. Preprint.

Achieving secure and efficient lattice-based public-key encryption: the impact of the secret-key distribution

Sauvik Bhattacharya, Oscar Garcia-Morchon, Rachel Player, Ludo Tolhuizen. Preprint.

δ-subgaussian random variables in cryptography

Sean Murphy, Rachel Player. The 24th Australasian Conference on Information Security and Privacy, ACISP 2019, Proceedings, pages 251-268, 2019.

Estimate all the {LWE,NTRU} schemes!

Martin R. Albrecht, Benjamin R. Curtis, Amit Deo, Alex Davidson, Rachel Player, Eamonn W. Postlethwaite, Fernando Virdia, Thomas Wunderer. Security and Cryptography for Networks - 11th International Conference, SCN 2018, Proceedings, pages 351-367, 2018. Check out the project webpage.

High-Precision Arithmetic in Homomorphic Encryption

Hao Chen, Kim Laine, Rachel Player, Yuhou Xia. Topics in Cryptology – CT-RSA 2018, Proceedings, pages 116–136, 2018.

Simple Encrypted Arithmetic Library – SEAL v2.1

Hao Chen, Kim Laine, Rachel Player. Financial Cryptography and Data Security – FC 2017 International Workshops, WAHC, BITCOIN, VOTING, WTSC, and TA, Revised Selected Papers, pages 3–18, 2017.

On the Hardness of LWE with Binary Error - Revisiting the Hybrid Lattice-Reduction and Meet-in-the-Middle Attack

Johannes Buchmann, Florian Göpfert, Rachel Player, Thomas Wunderer. Progress in Cryptology – AFRICACRYPT 2016, pages 24–43, 2016.

On the concrete hardness of Learning with Errors

Martin R. Albrecht, Rachel Player, Sam Scott Journal of Mathematical Cryptology. Volume 9, Issue 3, Pages 169–203, 2015. Check out the LWE Estimator or its documentation.

Talks

  • 6 December 2019. Evaluating the effectiveness of heuristic worst-case noise analysis in FHE. DS Lunch Colloquium, Radboud University, Nijmegen
  • 2 December 2019. Evaluating the effectiveness of heuristic worst-case noise analysis in FHE. COSIC Seminar, KU Leuven, Belgium
  • 18 October 2019. On the condition number of Macaulay matrices. Dagstuhl Seminar on Quantum Cryptanalysis, Germany
  • 18 August 2019. Discretisation and Product Distributions in Ring-LWE. MathCrypt 2019 workshop presentation, Santa Barbara, USA
  • 3 July 2019. δ-subgaussian Random Variables in Cryptography. ACISP 2019 conference presentation, Christchurch, New Zealand
  • 2 May 2019. δ-subgaussian Random Variables in Cryptography. PROMETHEUS meeting, CWI, Amsterdam
  • 26 February 2019. Homomorphic Encryption: State of the art and applications. Invited seminar at Cryptosense, Paris, France
  • 10 August 2018. Security and encoding in Fully Homomorphic Encryption. Seminar at the Turing, Turing Institute, London, UK
  • 18 July 2018. Homomorphic Encryption: State of the art and applications. Invited talk at Workshop on Privacy Enhancing Technologies, Royal Society, London, UK
  • 18 April 2018. High-Precision Arithmetic in Homomorphic Encryption. CT-RSA Conference presentation, San Francisco, USA
  • 12 April 2018. Estimate all the {LWE,NTRU} schemes!. Invited talk at First PQC standardization conference, Fort Lauderdale, USA
  • 9 March 2018. Estimate all the {LWE,NTRU} schemes!. Quantum-safe cryptography seminar, Sorbonne Université, Paris, France
  • 29 September 2017. Parameter selection in Ring-LWE-based FHE. Lattice coding & crypto meeting, Imperial College, London, UK
  • 21 April 2017. Parameter selection for security and correctness in FHE. Microsoft Research, Redmond, USA
  • 7 April 2017. Simple Encrypted Arithmetic Library – SEAL. WAHC’17 conference presentation, Sliema, Malta
  • 2 February 2017. Simple Encrypted Arithmetic Library – SEAL. PhD Student Seminar, Royal Holloway, University of London, UK
  • 7 September 2016. Simple Encrypted Arithmetic Library – SEAL. Workshop on lattice-based cryptography with Kyushu University, Royal Holloway, University of London, UK
  • June 2016. On the concrete hardness of Learning with Errors. Crypto group lunch, Microsoft Research, Redmond, USA
  • 29 February 2016. On the hardness of LWE with binary error. Workshop on cyber security, Kyushu University, Japan
  • 4 November 2015. On the concrete hardness of Learning with Errors. Cryptography seminar, University of Oxford, UK
  • 25 May 2015. On the concrete hardness of Learning with Errors. Presentation at ICMS Workshop, Edinburgh, UK
  • 26 March 2015. On the concrete hardness of Learning with Errors. CROSSING student seminar, TU Darmstadt, Germany
  • 12 March 2015. On the concrete hardness of Learning with Errors. ISG Seminar, jointly with Sam Scott, Royal Holloway, University of London, UK
  • 20 February 2015. On the concrete hardness of Learning with Errors. Cryptography group seminar, University of Bristol, UK

Experience

Department of Information Security, Royal Holloway, UK

Novemer 2019 - present

Lecturer

I am a lecturer in the Department of Information Security. To see what I have been working on most recently, check out my dblp and Google Scholar entries.

Reviewing and subreviewing:

  • NutMiC 2019, Eurocrypt 2019, PQCrypto 2019, ISIT 2019, MathCrypt 2018, SAC 2018, IMACC 2017, PQCrypto 2017, PKC 2017, Asiacrypt 2016, CT-RSA 2015
  • Designs, Codes and Cryptography, Journal of Algebra, Advances in Mathematics of Communications, International Journal of Information Security, IEEE Transactions on Information Theory, IEEE Communications Letters

Service:

ISG, Royal Holloway, UK

January 2019 - October 2019

Postdoctoral researcher

I was a postdoc in the Information Security Group working with Martin R. Albrecht as part of the EU H2020 PROMETHEUS project on lattice-based cryptography.

LIP6, Paris, France

February 2018 - December 2018

Postdoctoral researcher

I was a postdoc in the PolSys group of LIP6 which is common between Sorbonne Université, CNRS and INRIA. I worked with Jean-Charles Faugère and Ludovic Perret on post-quantum cryptography as part of the RISQ project.

Microsoft Research, Redmond, USA

April - July 2016

Intern

I interned in the Cryptography Group where my mentor was Kim Laine. The goal of my internship was to implement the FV scheme in SEAL, the homomorphic encryption library developed by Microsoft Research. In June 2016, we released this as SEAL v2.0. I continued to collaborate with the group and was invited for a research visit in April 2017.

Education

Royal Holloway, University of London

2013 - 2018

Information Security (PhD)

I studied for my PhD in the Information Security Group where I was supervised by Carlos Cid and Sean Murphy. A major focus of my research was on the concrete security of the Learning with Errors problem and its variants. My thesis investigates parameter selection in lattice-based cryptography.

During 2015-2016, I was co-organiser of the PhD Student Seminar. In 2016-2017, I was a committee member of the Wisdom group, managing their Twitter profile and organising events.

University of Warwick

2009 - 2013

Mathematics (MMath, Hons)

I graduated with First Class Honours from an undergraduate Masters degree in mathematics. My MMath research project, in the area of Number Theory, was featured in the undergraduate prospectus!

I was an active member of the Wind Orchestra and served twice on the committee, including as President in 2011-2012.