On Higher-Order Cryptography

Authors Boaz Barak, Raphaëlle Crubillé, Ugo Dal Lago



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Author Details

Boaz Barak
  • Harvard University, Cambridge, MA, USA
Raphaëlle Crubillé
  • IMDEA Software Institute, Madrid, Spain
  • University of Paris, IRIF, France
Ugo Dal Lago
  • University of Bologna, Italy
  • INRIA, Sophia Antipolis, France

Acknowledgements

We thank Juspreet Singh Sandhu for helpful discussions during the early stages of this project.

Cite As Get BibTex

Boaz Barak, Raphaëlle Crubillé, and Ugo Dal Lago. On Higher-Order Cryptography. In 47th International Colloquium on Automata, Languages, and Programming (ICALP 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 168, pp. 108:1-108:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.ICALP.2020.108

Abstract

Type-two constructions abound in cryptography: adversaries for encryption and authentication schemes, if active, are modeled as algorithms having access to oracles, i.e. as second-order algorithms. But how about making cryptographic schemes themselves higher-order? This paper gives an answer to this question, by first describing why higher-order cryptography is interesting as an object of study, then showing how the concept of probabilistic polynomial time algorithm can be generalized so as to encompass algorithms of order strictly higher than two, and finally proving some positive and negative results about the existence of higher-order cryptographic primitives, namely authentication schemes and pseudorandom functions.

Subject Classification

ACM Subject Classification
  • Theory of computation → Denotational semantics
  • Theory of computation → Probabilistic computation
  • Theory of computation → Cryptographic primitives
Keywords
  • Higher-order computation
  • probabilistic computation
  • game semantics
  • cryptography

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