Information-Theoretic Cryptography and Perfect Secrecy

Behrouz Zolfaghari*, Khodakhast Bibak

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter


In this chapter, we first introduce entropy and some basic concepts related to information theory. We show how entropy has find its way from thermodynamics into information theory and consequently into related areas including cryptography. Then, we show and investigate the role of entropy and information theory in the ecosystem of cryptography. Next, we study perfect secrecy along with its notions, approaches, and variants. We continue to study the applications of perfect secrecy in cryptography and related scenarios. In the next step, we present an overview on OTP as the only real-world implementation of perfect secrecy and describe its role in the future of cryptography.

Original languageEnglish
Title of host publicationSignals and Communication Technology
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages11
Publication statusPublished - 2022
Externally publishedYes

Publication series

NameSignals and Communication Technology
ISSN (Print)1860-4862
ISSN (Electronic)1860-4870


  • Entropy
  • Information-theoretic cryptography
  • One-time pad (OTP)
  • Perfect secrecy
  • Perfectly secure cryptography

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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