Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Johannes, Blömer"'
Publikováno v:
Proceedings of the European Conference on Information Systems (ECIS); 2023, p1-19, 19p
Publikováno v:
Advances in Data Analysis and Classification. 14:147-173
In this paper, we present a theoretical and an experimental comparison of EM and SEM algorithms for different mixture models. The SEM algorithm is a stochastic variant of the EM algorithm. The qualitative intuition behind the SEM algorithm is simple:
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3aa83f83f0332dbda05876ede1895b78
https://doi.org/10.1007/s11634-019-00366-7
https://doi.org/10.1007/s11634-019-00366-7
Autor:
Nils Löken, Johannes Blömer
Publikováno v:
Foundations and Practice of Security ISBN: 9783030453701
FPS
FPS
We present a searchable encryption scheme for dynamic document collections in a multi-user scenario. Our scheme features fine-grained access control to search results, as well as access control to operations such as adding documents to the document c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed59a09a11f44b615cf418fe84720e65
https://doi.org/10.1007/978-3-030-45371-8_19
https://doi.org/10.1007/978-3-030-45371-8_19
Autor:
Johannes Blömer, Kathlén Kohn
Publikováno v:
SIAM Journal on Applied Algebra and Geometry. 2:314-338
Motivated by the deterministic single exponential time algorithm of Micciancio and Voulgaris for solving the shortest and closest vector problem for the Euclidean norm, we study the geometry and complexity of Voronoi cells of lattices with respect to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38c4400bea597bf0ccb6f895a169f059
https://doi.org/10.1137/17m1132045
https://doi.org/10.1137/17m1132045
Autor:
Johannes Blömer, Nils Löken
Publikováno v:
Security and Trust Management ISBN: 9783030315108
STM
STM
We propose a novel personal reputation system for cross-platform reputation. We observe that, in certain usage scenarios, e.g. crowd work, the rater anonymity property typically imposed on reputation systems is not necessary. Instead, we propose a re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d918defd6d82bad2683337d11a21c049
https://doi.org/10.1007/978-3-030-31511-5_9
https://doi.org/10.1007/978-3-030-31511-5_9
Autor:
Fabian Eidens, Laurens Porzenheim, Jan Haltermann, Jakob Juhnke, Lukas Eilers, Kai Bemmann, Denis Diemert, Michael Schlichtig, Burhan Otour, Simon Pukrop, Erik Schilling, Marcel Stienemeier, Jan Bobolz, Henrik Bröcher, Johannes Blömer
Publikováno v:
ARES
We present CLARC (Cryptographic Library for Anonymous Reputation and Credentials), an anonymous credentials system (ACS) combined with an anonymous reputation system. Using CLARC, users can receive attribute-based credentials from issuers. They can e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe27f0093102faa3c77942cd1c2a9e55
https://doi.org/10.1145/3230833.3234517
https://doi.org/10.1145/3230833.3234517
Autor:
Johannes Blömer, Nils Löken
Publikováno v:
ARES
Blomer et al. have presented a cloud architecture for enabling fine-grained cryptographic access control to data in the cloud. The architecture is intended to provide this service to large-scale orgnaizations. We revisit the cloud architecture, and e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ecdc915663c761aa8a29eff770b4ad3f
https://doi.org/10.1145/3230833.3230853
https://doi.org/10.1145/3230833.3230853
Publikováno v:
Cryptology and Network Security ISBN: 9783030004330
CANS
CANS
Despite the recent advances in attribute-based signatures (ABS), no schemes have yet been considered under a strong privacy definition. We enhance the security of ABS by presenting a strengthened simulation-based privacy definition and the first attr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d04f84c7ed670a387a1d0c7c5f424737
https://doi.org/10.1007/978-3-030-00434-7_12
https://doi.org/10.1007/978-3-030-00434-7_12
Autor:
Johannes Blömer, Jan Bobolz
Publikováno v:
Applied Cryptography and Network Security ISBN: 9783319933863
ACNS
ACNS
We introduce the notion of delegatable attribute-based anonymous credentials (DAAC). Such systems offer fine-grained anonymous access control and they give the credential holder the ability to issue more restricted credentials to other users. In our
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::34d7796f212d86680516694c96e22506
https://doi.org/10.1007/978-3-319-93387-0_12
https://doi.org/10.1007/978-3-319-93387-0_12
Publikováno v:
Lecture Notes in Computer Science ISBN: 9783319769523
CT-RSA
CT-RSA
We consider reputation systems in the Universal Composability Framework where users can anonymously rate each others products that they purchased previously. To obtain trustworthy, reliable, and honest ratings, users are allowed to rate products only
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab733ca6553e1254cc63a50dd88cb7d3
https://doi.org/10.1007/978-3-319-76953-0_25
https://doi.org/10.1007/978-3-319-76953-0_25