A note on the equivalence of IND-CCA & INT-PTXT and IND-CCA & INT-CTXT

Daniel Jost; Christian Badertscher; Fabio Banfi

Paper 2018/135 Original: eprint.iacr.org/2018/135 ↗

A note on the equivalence of IND-CCA & INT-PTXT and IND-CCA & INT-CTXT

Daniel Jost

Christian Badertscher

Fabio Banfi

Abstract

The security for authenticated encryption schemes is often captured by demanding CCA security (IND-CCA) and integrity of plaintexts (INT-PTXT). In this short note, we prove that this implies in particular integrity of ciphertexts, i.e., INT-CTXT. Hence, the two sets of requirements mentioned in the title are equivalent.

Metadata

Available format(s): PDF
Publication info: Preprint.
History: 2018-02-07: last updated; 2018-02-07: published
Short URL: https://ia.cr/2018/135
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2018/135,
      author = {Daniel Jost and Christian Badertscher and Fabio Banfi},
      title = {A note on the equivalence of IND-CCA & INT-PTXT and IND-CCA & INT-CTXT},
      howpublished = {Cryptology {ePrint} Archive, Paper 2018/135},
      year = {2018},
      url = {https://eprint.iacr.org/2018/135}
}