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

Daniel Jost; Christian Badertscher; Fabio Banfi

Paper 2018/135

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

Daniel Jost, Christian Badertscher, and 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. MINOR revision.
Contact author(s): daniel jost @ inf ethz ch
History: 2018-02-07: received
Short URL: https://ia.cr/2018/135
License: CC BY

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}
}