---
res:
  bibo_abstract:
  - "We construct more efficient cryptosystems with provable\r\nsecurity against adaptive
    attacks, based on simple and natural hardness\r\nassumptions in the standard model.
    Concretely, we describe:\r\n– An adaptively-secure variant of the efficient, selectively-secure
    LWE-\r\nbased identity-based encryption (IBE) scheme of Agrawal, Boneh,\r\nand
    Boyen (EUROCRYPT 2010). In comparison to the previously\r\nmost efficient such
    scheme by Yamada (CRYPTO 2017) we achieve\r\nsmaller lattice parameters and shorter
    public keys of size O(log λ),\r\nwhere λ is the security parameter.\r\n– Adaptively-secure
    variants of two efficient selectively-secure pairing-\r\nbased IBEs of Boneh and
    Boyen (EUROCRYPT 2004). One is based\r\non the DBDH assumption, has the same ciphertext
    size as the cor-\r\nresponding BB04 scheme, and achieves full adaptive security
    with\r\npublic parameters of size only O(log λ). The other is based on a q-\r\ntype
    assumption and has public key size O(λ), but a ciphertext is\r\nonly a single
    group element and the security reduction is quadrat-\r\nically tighter than the
    corresponding scheme by Jager and Kurek\r\n(ASIACRYPT 2018).\r\n– A very efficient
    adaptively-secure verifiable random function where\r\nproofs, public keys, and
    secret keys have size O(log λ).\r\nAs a technical contribution we introduce blockwise
    partitioning, which\r\nleverages the assumption that a cryptographic hash function
    is weak\r\nnear-collision resistant to prove full adaptive security of cryptosystems.@eng"
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Tibor
      foaf_name: Jager, Tibor
      foaf_surname: Jager
  - foaf_Person:
      foaf_givenName: Rafael
      foaf_name: Kurek, Rafael
      foaf_surname: Kurek
  - foaf_Person:
      foaf_givenName: David
      foaf_name: Niehues, David
      foaf_surname: Niehues
      foaf_workInfoHomepage: http://www.librecat.org/personId=36113
  bibo_doi: 10.1007/978-3-030-75245-3_22
  dct_date: 2021^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0302-9743
  - http://id.crossref.org/issn/1611-3349
  - http://id.crossref.org/issn/9783030752446
  - http://id.crossref.org/issn/9783030752453
  dct_language: eng
  dct_title: Efficient Adaptively-Secure IB-KEMs and VRFs via Near-Collision Resistance@
...