christian janson

Bild: Katrin Binner

I am an Athene Young Investigator in Cryptography and Information Security affiliated to the Cryptoplexity team led by Marc Fischlin at Technische Universität Darmstadt in which I have been a Postdoc before as well.
Prior to this I was a Ph.D. student in the Information Security Group at Royal Holloway, University of London under the supervision of Carlos Cid. It all began at Universität Bremen where I studied mathematics and completed my diploma in the AlZAGK group under the supervision of Michael Hortmann.

I am a member of the IACR and my Erdös number is 3.

research interests

My main (current) research interests are:

  • verifiable outsourced computations

  • key exchange

  • secure channels

  • authenticated encryption

  • signature schemes

  • leakage-resilient cryptography

NEWS

02.11.2021: Our talk Making Signal Post-quantum Secure: Post-quantum Asynchronous Deniable Key Exchange from Key Encapsulation and Designated Verifier Signatures has been accepted to RWC 2022. This talk is based on joint work with Jacqueline Brendel, Rune Fiedler, Felix Günther, and Douglas Stebila and the paper is available on ePrint.

01.09.2021: Our paper BlindOR: An Efficient Lattice-based Blind Signature Scheme from OR-Proofs (joint work with Nabil Alkeilani Alkadri and Patrick Harasser) has been accepted to CANS 2021. The paper will be available soon.

20.08.2021: I will serve as a Programm Co-Chair with Thalia Laing at SSR 2022. Stay tuned for more information.

09.06.2021: Our paper Post-quantum asynchronous deniable key exchange and the Signal handshake (joint work with Jacqueline Brendel, Rune Fiedler, Felix Günther, and Douglas Stebila) is available on ePrint.

30.04.2021: An article about myself and my resreach as an Athene Young Investigator has appeared.

academic career and education

since April 2021: Athene Young Investigator in the Cryptoplexity team, Technische Universität Darmstadt

2017-2021: Postdoctoral researcher in the Cryptoplexity team, Technische Universität Darmstadt

2012-2016: Ph.D. in Information Security, Royal Holloway, University of London

2006-2012: Diploma in mathematics, Universität Bremen

professional activities

2022: Security Standardisation Research Conference Program Co-Chair

May 2019: Eurocrypt 2019 Workshop General Co-Chair

since March 2017: member of examining board (Prüfungskommission) in the computer science department

peer reviewing

Scientific Conferences

2022: Eurocrypt

2021: Eurocrypt, Crypto, iPAT

2020: PKC, Crypto, iPAT

2019: PKC, Crypto, Asiacrypt, IMA CC, iPAT

2018: Financial Cryptography, PKC, CT-RSA, Crypto, CCS, iPAT, Asiacrypt

2017: ISSAC, AEIT, ISC

2016: CT-RSA

2015: ESORICS, ACNS, CT-RSA

2014: SAC

Journals

2021: Journal of Cryptology, Transactions on Information Forensics and Security

2017: Journal of Designs, Codes and Cryptography

2016: Journal of Designs, Codes and Cryptography, IEEE Transactions on Information Forensics and Security

programm committee

2021: iPAT, SAC

2020: iPAT

2019: IMA CC, iPAT

2018: iPAT

awards

2018: Best Teaching Award for Lecture Real World Crypto, TU Darmstadt, summer term 2017 (teaching assistant)

research visits

January 2019: UCSD, San Diego, USA - Dep. of Computer Science and Engineering

Host: Dr. Felix Günther

September 2017: NTNU Trondheim, Trondheim, NO - Dep. of Information Security and Communication Technology

Host: Prof. Colin Boyd & Dr. Gareth T. Davies

August 2015: Universität Mannheim, Mannheim, GER - Dependable Systems Engineering

Host: Prof. Dr. Frederik Armknecht

Mai 2015: Universität Mannheim, Mannheim, GER - Dependable Systems Engineering

Host: Prof. Dr. Frederik Armknecht

Supervision

In case you wish to write a Bachelor/Master thesis with me then please contact me via email.

Master

R. F. (Nov 2019 - May 2020) - Stronger Security Notions for Post-Quantum Signature Schemes

O. K. (Dec 2019 - Dec 2020) - Formale Verifikation von Bluetooth

Bachelor

T. D. (Sep 2021 - ongoing) - How to designate a verifier in designated-verifier siganture schemes

S. A. (Dec 2020 - May 2021) - Modifikation eines Schlüsselaustauschprotokolls und CrySL-Rules für CogniCrypt

R. K. (Nov 2020 - Mar 2021) - Analyse der Authentifizierungsmethode der VDV Kernapplikation

F.B. (May - Sep 2020) - Security of the FIDO2 Standard

T. K. (May - July 2019) - Sicherheit des USB-Typ-C Authentifizierungsprotokolls

J.-P. M. (Apr - Jul 2019) - Analysis of the Current State of Non Memory-hard Password-based Cryptographic Primitives