Designing Business Reputation Ecosystems — A Method for Issuing and Trading Monetary Ratings on a Blockchain
S. Hemmrich, J. Bobolz, D. Beverungen, J. Blömer, in: ECIS 2023 Research Papers, 2023.
LibreCat: /record/44855

Practical Cryptograhic Techniques for Secure and Privacy-Preserving Customer Loyalty Systems
J. Blömer, J. Bobolz, F. Eidens, T. Jager, P. Kramer, in: C.-J. Haake, F. Meyer auf der Heide, M. Platzner, H. Wachsmuth, H. Wehrheim (Eds.), On-The-Fly Computing -- Individualized IT-Services in Dynamic Markets, Heinz Nixdorf Institut, Universität Paderborn, Paderborn, 2023, pp. 237–246.
LibreCat: /record/45901
DOI: 10.5281/zenodo.8068755

Robustness and Security
J. Blömer, F. Eidens, T. Jager, D. Niehues, C. Scheideler, in: C.-J. Haake, F. Meyer auf der Heide, M. Platzner, H. Wachsmuth, H. Wehrheim (Eds.), On-The-Fly Computing -- Individualized IT-Services in Dynamic Markets, Heinz Nixdorf Institut, Universität Paderborn, Paderborn, 2023, pp. 145–164.
LibreCat: /record/45891
DOI: 10.5281/zenodo.8068629

On the impossibility of surviving (iterated) deletion of weakly dominated strategies in rational MPC
J. Blömer, J. Bobolz, H. Bröcher, in: 2023.
LibreCat: /record/35014

A Generic Construction of an Anonymous Reputation System and Instantiations from Lattices
J. Blömer, J. Bobolz, L.A. Porzenheim, in: 2023.
LibreCat: /record/43458

A Complexity Theoretical Study of Fuzzy K-Means
J. Blömer, S. Brauer, K. Bujna, ACM Transactions on Algorithms 16 (2020) 1–25.
LibreCat: /record/20888
DOI: 10.1145/3409385

How well do SEM algorithms imitate EM algorithms? A non-asymptotic analysis for mixture models
J. Blömer, S. Brauer, K. Bujna, D. Kuntze, Advances in Data Analysis and Classification 14 (2020) 147–173.
LibreCat: /record/10790
DOI: 10.1007/s11634-019-00366-7

Personal Cross-Platform Reputation
J. Blömer, N. Löken, in: Security and Trust Management, STM 2019, 2019.
LibreCat: /record/13554
DOI: 10.1007/978-3-030-31511-5_9

Dynamic Searchable Encryption with Access Control
J. Blömer, N. Löken, in: 12th International Symposium on Foundations and Practice of Security, FPS 2019, Springer, 2019.
LibreCat: /record/13557

Updatable Anonymous Credentials and Applications to Incentive Systems
J. Blömer, J. Bobolz, D.P. Diemert, F. Eidens, in: Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security - CCS ’19, 2019.
LibreCat: /record/13904
DOI: 10.1145/3319535.3354223

Practical, Anonymous, and Publicly Linkable Universally-Composable Reputation Systems
J. Blömer, F. Eidens, J. Juhnke, in: Topics in Cryptology - CT-RSA 2018 - The Cryptographers’ Track at the RSA Conference 2018, Proceedings, Springer International Publishing, Cham, 2018, pp. 470–490.
LibreCat: /record/2862
DOI: 10.1007/978-3-319-76953-0_25

Voronoi Cells of Lattices with Respect to Arbitrary Norms
J. Blömer, K. Kohn, SIAM Journal on Applied Algebra and Geometry. 2 (2018) 314–338.
LibreCat: /record/2685
DOI: 10.1137/17M1132045

Fully-Featured Anonymous Credentials with Reputation System
K. Bemmann, J. Blömer, J. Bobolz, H. Bröcher, D.P. Diemert, F. Eidens, L. Eilers, J.F. Haltermann, J. Juhnke, B. Otour, L.A. Porzenheim, S. Pukrop, E. Schilling, M. Schlichtig, M. Stienemeier, in: Proceedings of the 13th International Conference on Availability, Reliability and Security - ARES ’18, ACM, New York, NY, USA, n.d.
LibreCat: /record/3265
DOI: 10.1145/3230833.3234517

Cloud Architectures for Searchable Encryption
J. Blömer, N. Löken, in: Proceedings of the 13th International Conference on Availability, Reliability and Security, ARES 2018, ACM, New York, NY, USA, n.d., pp. 25:1--25:10.
LibreCat: /record/2965
DOI: 10.1145/3230833.3230853

Provably Anonymous Communication Based on Trusted Execution Environments
J. Blömer, J. Bobolz, C. Scheideler, A. Setzer, Provably Anonymous Communication Based on Trusted Execution Environments, n.d.
LibreCat: /record/5820

Coresets for Fuzzy K-Means with Applications
J. Blömer, S. Brauer, K. Bujna, in: 29th International Symposium on Algorithms and Computation  (ISAAC 2018), Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik, 2018, pp. 46:1--46:12.
LibreCat: /record/4344
DOI: 10.4230/LIPIcs.ISAAC.2018.46

Enhanced Security of Attribute-Based Signatures
J. Blömer, F. Eidens, J. Juhnke, in: The International Conference on Cryptology And Network Security (CANS), Springer, 2018, pp. 235–255.
LibreCat: /record/3873
DOI: 10.1007/978-3-030-00434-7_12

Delegatable Attribute-based Anonymous Credentials from Dynamically Malleable Signatures
J. Blömer, J. Bobolz, in: ACNS 2018 Applied Cryptography &; Network Security, n.d.
LibreCat: /record/2379
DOI: 10.1007/978-3-319-93387-0_12

Subtleties in Security Definitions for Predicate Encryption with Public Index
J. Blömer, G. Liske, in: Proceedings of the International Conference of Mathematical Aspects of Computer and Information Sciences (MACIS), Springer International Publishing, Cham, 2017, pp. 438–453.
LibreCat: /record/2967
DOI: 10.1007/978-3-319-72453-9_35

Attribute-Based Encryption as a Service for Access Control in Large-Scale Organizations
J. Blömer, P. Günther, V. Krummel, N. Löken, in: Foundations and Practice of Security, Springer International Publishing, Cham, 2017, pp. 3–17.
LibreCat: /record/2344
DOI: 10.1007/978-3-319-75650-9_1

Singular Curve Point Decompression Attack
J. Blömer, P. Günther, in: 2015 Workshop on Fault Diagnosis and Tolerance in Cryptography (FDTC), IEEE, 2016.
LibreCat: /record/2947
DOI: 10.1109/fdtc.2015.17

Theoretical Analysis of the k-Means Algorithm – A Survey
J. Blömer, C. Lammersen, M. Schmidt, C. Sohler, in: Algorithm Engineering, Springer International Publishing, Cham, 2016, pp. 81–116.
LibreCat: /record/2968
DOI: 10.1007/978-3-319-49487-6_3

Hard-Clustering with Gaussian Mixture Models
J. Blömer, S. Brauer, K. Bujna, (2016).
LibreCat: /record/2969

Adaptive Seeding for Gaussian Mixture Models
J. Blömer, K. Bujna, in: Advances in Knowledge Discovery and Data Mining, Springer International Publishing, Cham, 2016, pp. 296–308.
LibreCat: /record/2970
DOI: 10.1007/978-3-319-31750-2_24

Effizienz und Sicherheit paarungsbasierter Kryptographie
J. Blömer, P. Günther, Effizienz Und Sicherheit Paarungsbasierter Kryptographie, Tagungsband des 26. Fraunhofer SIT Smartcard-Workshops, 2016.
LibreCat: /record/2971

A Theoretical Analysis of the Fuzzy K-Means Problem
J. Blömer, S. Brauer, K. Bujna, in: 2016 IEEE 16th International Conference on Data Mining (ICDM), IEEE, 2016, pp. 805–810.
LibreCat: /record/2367
DOI: 10.1109/icdm.2016.0094

Construction of Fully CCA-Secure Predicate Encryptions from Pair Encoding Schemes
J. Blömer, G. Liske, in: Proceedings of the CT-RSA 2016, 2016, pp. 431–447.
LibreCat: /record/208
DOI: 10.1007/978-3-319-29485-8_25

Adaptive Seeding for Gaussian Mixture Models
J. Blömer, K. Bujna, in: Advances in Knowledge Discovery and Data Mining, Springer International Publishing, Cham, 2016, pp. 296–308.
LibreCat: /record/2978
DOI: 10.1007/978-3-319-31750-2_24

Short Group Signatures with Distributed Traceability
J. Blömer, J. Juhnke, N. Löken, in: Proceedings of the Sixth International Conference on Mathematical Aspects of Computer and Information Sciences (MACIS), 2015, pp. 166–180.
LibreCat: /record/253
DOI: 10.1007/978-3-319-32859-1_14

Anonymous and Publicly Linkable Reputation Systems
J. Blömer, J. Juhnke, C. Kolb, in: Proceedings of the 18th International Conference on Financial Cryptography and Data Security (FC), 2015, pp. 478--488.
LibreCat: /record/322
DOI: 10.1007/978-3-662-47854-7_29

Voronoi Cells of Lattices with Respect to Arbitrary Norms
J. Blömer, K. Kohn, Voronoi Cells of Lattices with Respect to Arbitrary Norms, Universität Paderborn, 2015.
LibreCat: /record/233

Tampering attacks in pairing-based cryptography
J. Blömer, P. Günther, G. Liske, in: Proceedings of Fault Tolerance and Diagnosis in Cryptography(FDTC), 2014, pp. 1--7.
LibreCat: /record/355
DOI: 10.1109/FDTC.2014.10

Analysis of Agglomerative Clustering
M.R. Ackermann, J. Blömer, D. Kuntze, C. Sohler, Algorithmica 69 (2014).
LibreCat: /record/2976
DOI: 10.1007/s00453-012-9717-4

A Theoretical and Experimental Comparison of the EM and SEM Algorithm
J. Blömer, K. Bujna, D. Kuntze, in: 2014 22nd International Conference on Pattern Recognition, IEEE, 2014.
LibreCat: /record/2977
DOI: 10.1109/icpr.2014.253

Constructing CCA-secure predicate encapsulation schemes from CPA-secure schemes and universal one-way hash functions
J. Blömer, G. Liske, (2014).
LibreCat: /record/442

A Practical Second-Order Fault Attack against a Real-World Pairing Implementation
J. Blömer, R. Gomes da Silva, P. Günther, J. Krämer, J.-P. Seifert, in: Proceedings of Fault Tolerance and Diagnosis in Cryptography(FDTC), 2014, pp. 123--136.
LibreCat: /record/463
DOI: 10.1109/FDTC.2014.22

Improved Side Channel Attacks on Pairing Based Cryptography
J. Blömer, P. Günther, G. Liske, in: Constructive Side-Channel Analysis and Secure Design, Springer Berlin Heidelberg, Berlin, Heidelberg, 2013, pp. 154–168.
LibreCat: /record/2979
DOI: 10.1007/978-3-642-40026-1_10

Securing Critical Unattended Systems with Identity Based Cryptography - A Case Study
J. Blömer, P. Günther, V. Krummel, in: Proceedings of the 5th International Conference on Mathematical Aspects of Computer and Information Sciences (MACIS), 2013, pp. 98–105.
LibreCat: /record/488

Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles
J. Blömer, G. Liske, (2013).
LibreCat: /record/538

Turing und Kryptografie
J. Blömer, Informatik-Spektrum 35 (2012).
LibreCat: /record/2984
DOI: 10.1007/s00287-012-0622-7

Hardness and Non-Approximability of Bregman Clustering Problems.
M.R. Ackermann, J. Blömer, C. Scholz, (2011).
LibreCat: /record/2985

How to Share a Secret
J. Blömer, in: Algorithms Unplugged, Springer Berlin Heidelberg, Berlin, Heidelberg, 2011, pp. 159–168.
LibreCat: /record/2986
DOI: 10.1007/978-3-642-15328-0_17

Solving the Closest Vector Problem with respect to Lp Norms
J. Blömer, S. Naewe, ArXiv:1104.3720 (2011).
LibreCat: /record/2987

Bregman Clustering for Separable Instances
M.R. Ackermann, J. Blömer, in: SWAT 2010, Springer Berlin Heidelberg, Berlin, Heidelberg, 2010, pp. 212–223.
LibreCat: /record/2988
DOI: 10.1007/978-3-642-13731-0_21

Clustering for Metric and Nonmetric Distance Measures
M.R. Ackermann, J. Blömer, C. Sohler, ACM Trans. Algorithms (2010) 59:1--59:26.
LibreCat: /record/2990
DOI: 10.1145/1824777.1824779

On the initialization of dynamic models for speech features
A. Krueger, V. Leutnant, R. Haeb-Umbach, M. Ackermann, J. Blömer, Proc. of ITG Fachtagung Sprachkommunikation. ITG, Bochum, Germany (2010).
LibreCat: /record/2991

Engineering self-coordinating software intensive systems
W. Schäfer, A. Trächtler, M. Birattari, J. Blömer, M. Dorigo, G. Engels, R. O’Grady, M. Platzner, F. Rammig, W. Reif, in: Proceedings of the FSE/SDP Workshop on Future of Software Engineering Research - FoSER ’10, ACM Press, 2010.
LibreCat: /record/2994
DOI: 10.1145/1882362.1882428

Coresets and Approximate Clustering for Bregman Divergences
M.R. Ackermann, J. Blömer, in: Proceedings of the Twentieth Annual ACM-SIAM Symposium on Discrete Algorithms, Society for Industrial and Applied Mathematics, Philadelphia, PA, 2009, pp. 1088–1097.
LibreCat: /record/2995
DOI: 10.1137/1.9781611973068.118

Sampling methods for shortest vectors, closest vectors and successive minima
J. Blömer, S. Naewe, Theoretical Computer Science (2009) 1648–1665.
LibreCat: /record/2999
DOI: 10.1016/j.tcs.2008.12.045

Analysis of Countermeasures Against Access Driven Cache Attacks on AES
J. Blömer, V. Krummel, in: Selected Areas in Cryptography, Springer Berlin Heidelberg, Berlin, Heidelberg, 2007, pp. 96–109.
LibreCat: /record/3002
DOI: 10.1007/978-3-540-77360-3_7

Low Secret Exponent RSA Revisited
J. Blömer, A. May, in: Lecture Notes in Computer Science, Springer Berlin Heidelberg, Berlin, Heidelberg, 2007, pp. 4–19.
LibreCat: /record/3020
DOI: 10.1007/3-540-44670-2_2

Key Revocation with Interval Cover Families
J. Blömer, A. May, in: Selected Areas in Cryptography, Springer Berlin Heidelberg, Berlin, Heidelberg, 2007, pp. 325–341.
LibreCat: /record/3021
DOI: 10.1007/3-540-45537-x_26

A Probabilistic Zero-Test for Expressions Involving Roots of Rational Numbers
J. Blömer, in: Algorithms — ESA’ 98, Springer Berlin Heidelberg, Berlin, Heidelberg, 2007, pp. 151–162.
LibreCat: /record/3026
DOI: 10.1007/3-540-68530-8_13

Randomness and Secrecy - A Brief Introduction
J. Blömer, Journal of Universal Computer Science (J.UCS) (2006) 654--671.
LibreCat: /record/3003
DOI: 10.3217/jucs-012-06-0654

Fault Based Collision Attacks on AES
J. Blömer, V. Krummel, in: Lecture Notes in Computer Science, Springer Berlin Heidelberg, Berlin, Heidelberg, 2006, pp. 106–120.
LibreCat: /record/3004
DOI: 10.1007/11889700_11

Wagner’s Attack on a Secure CRT-RSA Algorithm Reconsidered
J. Blömer, M. Otto, in: Lecture Notes in Computer Science, Springer Berlin Heidelberg, Berlin, Heidelberg, 2006, pp. 13–23.
LibreCat: /record/3005
DOI: 10.1007/11889700_2

Sign Change Fault Attacks on Elliptic Curve Cryptosystems
J. Blömer, M. Otto, J.-P. Seifert, in: Lecture Notes in Computer Science, Springer Berlin Heidelberg, Berlin, Heidelberg, 2006, pp. 36–52.
LibreCat: /record/3007
DOI: 10.1007/11889700_4

A Tool Kit for Finding Small Roots of Bivariate Polynomials over the Integers
J. Blömer, A. May, in: EUROCRYPT 2005, Springer Berlin Heidelberg, Berlin, Heidelberg, 2005, pp. 251–267.
LibreCat: /record/3006
DOI: 10.1007/11426639_15

Provably Secure Masking of AES
J. Blömer, J. Guajardo, V. Krummel, in: Selected Areas in Cryptography, Springer Berlin Heidelberg, Berlin, Heidelberg, 2004, pp. 69–83.
LibreCat: /record/3011
DOI: 10.1007/978-3-540-30564-4_5

A Generalized Wiener Attack on RSA
J. Blömer, A. May, in: Public Key Cryptography – PKC 2004, Springer Berlin Heidelberg, Berlin, Heidelberg, 2004, pp. 1–13.
LibreCat: /record/3012
DOI: 10.1007/978-3-540-24632-9_1

A new CRT-RSA algorithm secure against bellcore attacks
J. Blömer, M. Otto, J.-P. Seifert, in: Proceedings of the 10th ACM Conference on Computer and Communication Security  - CCS ’03, ACM Press, 2004.
LibreCat: /record/3017
DOI: 10.1145/948109.948151

New Partial Key Exposure Attacks on RSA
J. Blömer, A. May, in: Advances in Cryptology - CRYPTO 2003, Springer Berlin Heidelberg, Berlin, Heidelberg, 2003, pp. 27–43.
LibreCat: /record/3016
DOI: 10.1007/978-3-540-45146-4_2

Fault Based Cryptanalysis of the Advanced Encryption Standard (AES)
J. Blömer, J.-P. Seifert, in: Financial Cryptography, Springer Berlin Heidelberg, Berlin, Heidelberg, 2003, pp. 162–181.
LibreCat: /record/3018
DOI: 10.1007/978-3-540-45126-6_12

Priority encoding transmission
A. Albanese, J. Blömer, J. Edmonds, M. Luby, M. Sudan, IEEE Transactions on Information Theory 42 (2002) 1737–1744.
LibreCat: /record/3034
DOI: 10.1109/18.556670

Priority encoding transmission
A. Albanese, J. Blömer, J. Edmonds, M. Luby, M. Sudan, in: Proceedings 35th Annual Symposium on Foundations of Computer Science, IEEE Comput. Soc. Press, 2002.
LibreCat: /record/3040
DOI: 10.1109/sfcs.1994.365731

Computing sums of radicals in polynomial time
J. Blömer, in: [1991] Proceedings 32nd Annual Symposium of Foundations of Computer Science, IEEE Comput. Soc. Press, 2002.
LibreCat: /record/3041
DOI: 10.1109/sfcs.1991.185434

Closest Vectors, Successive Minima, and Dual HKZ-Bases of Lattices
J. Blömer, in: Automata, Languages and Programming, Springer Berlin Heidelberg, Berlin, Heidelberg, 2000, pp. 248–259.
LibreCat: /record/3023
DOI: 10.1007/3-540-45022-x_22

On the complexity of computing short linearly independent vectors and short bases in a lattice
J. Blömer, J.-P. Seifert, in: Proceedings of the Thirty-First Annual ACM Symposium on Theory of Computing  - STOC ’99, ACM Press, 1999.
LibreCat: /record/3024
DOI: 10.1145/301250.301441

A lower bound for a class of graph based loss resilient codes
J. Blömer, B. Trachsler, Technical Report/Departement of Computer Science, ETH Zürich (1998).
LibreCat: /record/3028

Denesting by bounded degree radicals
J. Blömer, in: Algorithms — ESA ’97, Springer Berlin Heidelberg, Berlin, Heidelberg, 1997, pp. 53–63.
LibreCat: /record/3029
DOI: 10.1007/3-540-63397-9_5

The rank of sparse random matrices over finite fields
J. Blömer, R. Karp, E. Welzl, Random Structures \'26; Algorithms (1997) 407–419.
LibreCat: /record/3033
DOI: 10.1002/(SICI)1098-2418(199707)10:4<407::AID-RSA1>3.0.CO;2-Y

Approximate matching of polygonal shapes
H. Alt, B. Behrends, J. Blömer, Annals of Mathematics and Artificial Intelligence 13 (1995).
LibreCat: /record/3037

An XOR-based erasure-resilient coding scheme
J. Blömer, M. Kalfane, R. Karp, M. Karpinski, M. Luby, D. Zuckerman, An XOR-Based Erasure-Resilient Coding Scheme, Berkeley, USA, 1995.
LibreCat: /record/3038

Simplifying Expressions Involving Radicals
J. Blömer, Simplifying Expressions Involving Radicals, PhD thesis, Freie Universität Berlin, Fachbereich Mathematik und Informatik, 1992.
LibreCat: /record/3043

Resemblance and symmetries of geometric patterns
H. Alt, J. Blömer, in: Data Structures and Efficient Algorithms, Springer Berlin Heidelberg, Berlin, Heidelberg, 1992, pp. 1–24.
LibreCat: /record/3046
DOI: 10.1007/3-540-55488-2_19

How to denest Ramanujan's nested radicals
J. Blömer, in: Proceedings., 33rd Annual Symposium on Foundations of Computer Science, IEEE, 1992.
LibreCat: /record/3047
DOI: 10.1109/sfcs.1992.267807

Approximate matching of polygonal shapes (extended abstract)
H. Alt, B. Behrends, J. Blömer, in: Proceedings of the Seventh Annual Symposium on Computational Geometry  - SCG ’91, ACM Press, 1991.
LibreCat: /record/3048
DOI: 10.1145/109648.109669

Computing sums of radicals in polynomial time
J. Blömer, in: Proceedings 32nd Annual Symposium of Foundations of Computer Science, IEEE Comput. Soc. Press, 1991.
LibreCat: /record/3049
DOI: 10.1109/sfcs.1991.185434

Approximation of convex polygons
H. Alt, J. Blömer, H. Wagener, in: Automata, Languages and Programming, Springer-Verlag, Berlin/Heidelberg, 1990, pp. 703–716.
LibreCat: /record/3050
DOI: 10.1007/bfb0032068