Jens Groth

Jens Groth
Department of Computer Science, UCL     
Gower Street
London WC1E 6BT
United Kingdom

Office: 7.21a
E-mail: j.groth@ucl.ac.uk (e-mail best way to reach me)
Phone: +44 20 7679 3666
Fax: +44 20 7387 1397
Skype: jensois

Openings

Click on openings for information on open positions and other opportunities to work with me.

Publications

Stephanie Bayer and Jens Groth: Efficient Zero-Knowledge Argument for Correctness of a Shuffle. To appear at Advances in Cryptology - EUROCRYPT 2012.
pdf    slides    (full paper)

Jens Groth: Efficient Zero-Knowledge Arguments from Two-Tiered Homomorphic Commitments. Advances in Cryptology - ASIACRYPT 2011, LNCS 7073, 431-448.
pdf    slides    (full paper)

Masayuki Abe, Jens Groth and Miyako Ohkubo: Separating Short Structure Preserving Signatures from Non-Interactive Assumptions. Advances in Cryptology - ASIACRYPT 2011, LNCS 7073, 628-646.

Masayuki Abe, Jens Groth, Kristiyan Haralambiev and Miyako Ohkubo: Optimal Structure-Preserving Signatures in Asymmetric Bilinear Groups. Advances in Cryptology - CRYPTO 2011, LNCS 6841, pages 649-666.
pdf    slides     (full paper)

Jens Groth: Minimizing Non-interactive Zero-Knowledge Proofs Using Fully Homomorphic Encryption. Manuscript 2011.
pdf   

Jens Groth: Short Non-interactive Zero-Knowledge Proofs. Advances in Cryptology - ASIACRYPT 2010, LNCS 6477, pages 341-358.
pdf    slides    (full paper)

Jens Groth: Short Pairing-Based Non-interactive Zero-Knowledge Arguments. Advances in Cryptology - ASIACRYPT 2010, LNCS 6477, pages 321-340.
pdf    slides    (full paper)

Jens Groth: A Verifiable Secret Shuffle of Homomorphic Encryptions. Journal of Cryptology, vol. 23(4), pages 546-579, 2010.
pdf    slides    (appeared earlier in PKC 2003)

Jens Groth: Homomorphic Trapdoor Commitments to Group Elements.
pdf    (manuscript)
Merged paper Masayuki Abe, Georg Fuchsbauer, Jens Groth, Kristiyan Haralambiev and Miyako Ohkubo: Structure-Preserving Signatures and Commitments to Group Elements. Advances in Cryptology - CRYPTO 2010, LNCS 6223, pages 209-236.

Jens Groth, Aggelos Kiayias and Helger Lipmaa: Multi-Query Computationally-Private Information Retrieval with Constant Communication Rate. Practice and Theory in Public Key Cryptography - PKC 2010, LNCS 6056, pages 107-123.
pdf    slides

Jens Groth: Linear Algebra with Sub-linear Size Zero-Knowledge Arguments. Advances in Cryptology - CRYPTO 2009, LNCS 5677, pages 192-208.
pdf    slides    more slides    (full paper)

Jens Groth and Yuval Ishai: Sub-linear Zero-Knowledge Argument for Correctness of a Shuffle. Advances in Cryptology - EUROCRYPT 2008, LNCS 4965, pages 379-396.
pdf    slides    (full paper)

Jens Groth and Steve Lu: A Non-interactive Shuffle with Pairing Based Verifiability. Advances in Cryptology - ASIACRYPT 2007, LNCS 4833, pages 51-67.
pdf    slides

Jens Groth: Fully Anonymous Group Signatures without Random Oracles. Advances in Cryptology - ASIACRYPT 2007, LNCS 4833, pages 164-180.
pdf    slides    (full paper)

Jens Groth and Rafail Ostrovsky: Cryptography in the Multi-string Model. Advances in Cryptology - CRYPTO 2007, LNCS 4622, pages 323-341.
pdf    (full paper)

Nishanth Chandran, Jens Groth and Amit Sahai: Ring Signatures of Sub-linear Size without Random Oracles. International Colloquium on Automata, Languages and Programming - ICALP 2007, LNCS 4596, pages 423-434.
pdf    slides

Jens Groth and Amit Sahai: Efficient Non-interactive Proof Systems for Bilinear Groups. Advances in Cryptology - EUROCRYPT 2008, LNCS 4965, pages 415-432.
pdf    slides    (full paper)

Jens Groth and Steve Lu: Verifiable Shuffle of Large Size Ciphertexts. Practice and Theory in Public Key Cryptography - PKC 2007, LNCS 4450, pages 377-392.
pdf    excel   

Jens Groth: Simulation-sound NIZK Proofs for a Practical Language and Constant Size Group Signatures. Advances in Cryptology - ASIACRYPT 2006, LNCS 4284, pages 444-459.
pdf    slides    (full paper)

Jens Groth, Rafail Ostrovsky and Amit Sahai: Non-interactive Zaps and New Techniques for NIZK. Advances in Cryptology - CRYPTO 2006, LNCS 4117, pages 97-111.
slides    (see full paper of Perfect Non-Interactive Zero-Knowledge for NP)

Douglas Wikström and Jens Groth: An Adaptively Secure Mix-Net Without Erasures. International Colloquium on Automata, Languages and Programming - ICALP 2006, LNCS 4052, pages 276-287.

Jens Groth, Rafail Ostrovsky and Amit Sahai: Perfect Non-Interactive Zero-Knowledge for NP. Advances in Cryptology - EUROCRYPT 2006, LNCS 4004, pages 338-359.
pdf    slides    (full paper)

Jens Groth: Non-interactive Zero-Knowledge Arguments for Voting. Applied Cryptography and Network Security - ACNS 2005, LNCS 3531, pages 467-482.
pdf      slides   (full paper)

Jens Groth: Cryptography in Subgroups of Zn*. Theory of Cryptography Conference - TCC 2005, LNCS 3378, pages 50-65.
pdf    slides   (corrected paper)

Jan Camenisch and Jens Groth: Group Signatures: Better Efficiency and New Theoretical Aspects. Security in Communication Networks - SCN 2004, LNCS 3352, pages 120-133.
pdf    (full paper)

Jens Groth: Evaluating Security of Voting Schemes in the Universal Composability Framework. Applied Cryptography and Network Security - ACNS 2004, LNCS 3089, pages 46-60.
pdf    slides    (full paper)

Jens Groth: Rerandomizable and Replayable Adaptive Chosen Ciphertext Attack Secure Cryptosystems. Theory of Cryptography Conference - TCC 2004, LNCS 2951, pages 152-170.
pdf    slides

Jens Groth: Efficient Maximal Privacy in Boardroom Voting and Anonymous Broadcast. Financial Cryptography - FC 2004, LNCS 3110, pages 90-104.
pdf    slides

Ivan Damgård and Jens Groth: Non-interactive and Reusable Non-malleable Commitment Schemes. Symposium on Theory of Computation - STOC 2003, pages 426-437.
pdf   slides    (corrected paper)

Jens Groth: A Verifiable Secret Shuffle of Homomorphic Encryptions. Practice and Theory in Public Key Cryptography - PKC 2003, LNCS 2567, pages 145-160.
(see journal version above)

Ivan Damgård, Jens Groth and Gorm Salomonsen: The Theory and Implementation of an Electronic Voting System. D. Gritzalis (Ed.), Secure Electronic Voting, Kluwer Academic Publishers, 2002, pages 77-99.
pdf

Jens Groth and Gorm Salomonsen: Strong Privacy Protection in Electronic Voting. Invited talk at Trust and Privacy in Digital Business - TrustBus 2001. Full paper available as BRICS technical report RS-04-23.

Program Committees

Future: CRYPTO 2012.

Current: PKC 2012, EUROCRYPT 2012.

Past: ACNS 2006, EUROCRYPT 2007, PKC 2008, TCC 2008, SCN 2008, TCC 2009, Pairing 2009, CRYPTO 2009, ASIACRYPT 2009, TCC 2010, AFRICACRYPT 2011, VoteID 2011, ASIACRYPT 2011.

Curriculum Vitae 

pdf

How to pronounce my name

English speakers can say Yens Grot. This captures the pronounciation of my first name quite well. Unfortunately, the Danish "o"-sound does not have an English equivalent. If you speak another language I suggest using that language's "o" and you may end up pronouncing my surname correctly as well.