---
_id: '29763'
abstract:
- lang: eng
  text: "Modern-day communication has become more and more digital. While this comes
    with many advantages such as a more efficient economy, it has also created more
    and more opportunities for various adversaries to manipulate communication or
    eavesdrop on it. The Snowden revelations in 2013 further highlighted the seriousness
    of these threats. To protect the communication of people, companies, and states
    from such threats, we require cryptography with strong security guarantees.\r\nDifferent
    applications may require different security properties from cryptographic schemes.
    For most applications, however, so-called adaptive security is considered a reasonable
    minimal requirement of security. Cryptographic schemes with adaptive security
    remain secure in the presence of an adversary that can corrupt communication partners
    to respond to messages of the adversaries choice, while the adversary may choose
    the messages based on previously observed interactions.\r\nWhile cryptography
    is associated the most with encryption, this is only one of many primitives that
    are essential for the security of digital interactions. This thesis presents novel
    identity-based encryption (IBE) schemes and verifiable random functions (VRFs)
    that achieve adaptive security as outlined above. Moreover, the cryptographic
    schemes presented in this thesis are proven secure in the standard model. That
    is without making use of idealized models like the random oracle model."
author:
- first_name: David
  full_name: Niehues, David
  id: '36113'
  last_name: Niehues
citation:
  ama: Niehues D. <i>More Efficient Techniques for Adaptively-Secure Cryptography</i>.;
    2022. doi:<a href="https://doi.org/10.25926/rdtq-jw45">10.25926/rdtq-jw45</a>
  apa: Niehues, D. (2022). <i>More Efficient Techniques for Adaptively-Secure Cryptography</i>.
    <a href="https://doi.org/10.25926/rdtq-jw45">https://doi.org/10.25926/rdtq-jw45</a>
  bibtex: '@book{Niehues_2022, title={More Efficient Techniques for Adaptively-Secure
    Cryptography}, DOI={<a href="https://doi.org/10.25926/rdtq-jw45">10.25926/rdtq-jw45</a>},
    author={Niehues, David}, year={2022} }'
  chicago: Niehues, David. <i>More Efficient Techniques for Adaptively-Secure Cryptography</i>,
    2022. <a href="https://doi.org/10.25926/rdtq-jw45">https://doi.org/10.25926/rdtq-jw45</a>.
  ieee: D. Niehues, <i>More Efficient Techniques for Adaptively-Secure Cryptography</i>.
    2022.
  mla: Niehues, David. <i>More Efficient Techniques for Adaptively-Secure Cryptography</i>.
    2022, doi:<a href="https://doi.org/10.25926/rdtq-jw45">10.25926/rdtq-jw45</a>.
  short: D. Niehues, More Efficient Techniques for Adaptively-Secure Cryptography,
    2022.
date_created: 2022-02-07T13:29:07Z
date_updated: 2022-02-07T13:32:28Z
ddc:
- '000'
department:
- _id: '558'
doi: 10.25926/rdtq-jw45
file:
- access_level: closed
  content_type: application/pdf
  creator: davnie
  date_created: 2022-02-07T13:26:05Z
  date_updated: 2022-02-07T13:26:05Z
  file_id: '29764'
  file_name: de2107.pdf
  file_size: 1542089
  relation: main_file
  success: 1
file_date_updated: 2022-02-07T13:26:05Z
has_accepted_license: '1'
keyword:
- public-key cryptography
- lattices
- pairings
- verifiable random functions
- identity-based encryption
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nd/4.0/
main_file_link:
- open_access: '1'
  url: https://elpub.bib.uni-wuppertal.de/servlets/DerivateServlet/Derivate-14686/de2107.pdf
oa: '1'
project:
- _id: '1'
  name: 'SFB 901: SFB 901'
- _id: '4'
  name: 'SFB 901 - C: SFB 901 - Project Area C'
- _id: '13'
  name: 'SFB 901 - C1: SFB 901 - Subproject C1'
publication_status: published
status: public
supervisor:
- first_name: Tibor
  full_name: Jager, Tibor
  id: '64669'
  last_name: Jager
- first_name: Anja
  full_name: Lehmann, Anja
  last_name: Lehmann
title: More Efficient Techniques for Adaptively-Secure Cryptography
type: dissertation
user_id: '36113'
year: '2022'
...