Light Cryptography

Pascal Lafourcade, Takaaki Mizuki, Atsuki Nagao, Kazumasa Shinagawa

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


Physical cryptography provides cryptographic protocols using physical objects like cards and envelopes instead of using computers. In this paper, we introduce a new model for physical cryptography, called light cryptography. It uses transparent sheets and some properties of light and shadows. We design several secure light cryptographic protocols: one for set-intersection (which can solve the scheduling problem), one for maximum (which can solve the Yao’s Millionaires’ problem), one for computing the sum of integers. We believe that our protocols using light cryptography are a powerful tool for information security education because they are fairly simple and fun to use.

Original languageEnglish
Title of host publicationInformation Security Education. Education in Proactive Information Security - 12th IFIP WG 11.8 World Conference WISE 12, Proceedings
EditorsLynette Drevin, Marianthi Theocharidou
PublisherSpringer New York LLC
Number of pages13
ISBN (Print)9783030234508
Publication statusPublished - 2019
Event12th IFIP WG 11.8 World Conference on Information Security Education, WISE 2019 - Lisbon, Portugal
Duration: 2019 Jun 252019 Jun 27

Publication series

NameIFIP Advances in Information and Communication Technology
ISSN (Print)1868-4238
ISSN (Electronic)1868-422X


Conference12th IFIP WG 11.8 World Conference on Information Security Education, WISE 2019


  • Information security education
  • Light cryptography
  • Physical cryptography
  • Secure computation


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