Paper 2003/118

Visual Crypto Displays Enabling Secure Communications

Pim Tuyls, Tom Kevenaar, Geert-Jan Schrijen, Toine Staring, and Marten van Dijk


In this paper we describe a low-tech and user friendly solution for secure two-way communication between two parties over a network of untrusted devices. We present a solution in which displays play a central role. Our approach guarantees privacy and allows to check the authenticity of information presented on displays. Furthermore, we provide the user with a secure return channel. To this end we propose to provide every user with a small decryption display which is, for example, integrated in a credit card and requires very limited computing power. The authentication and security are based on visual cryptography which was first introduced by Naor and Shamir in 1994. We solve some practical shortcomings of traditional visual cryptography and develop protocols for two-way authentication and privacy in untrusted environments.

Available format(s)
Publication info
Published elsewhere. First International Conference on Security in Pervasive Computing (SPC2003), Boppard, Germany, March 12-14, 2003.
visual cryptographydisplayLCD
Contact author(s)
geert jan schrijen @ philips com
2003-06-06: received
Short URL
Creative Commons Attribution


      author = {Pim Tuyls and Tom Kevenaar and Geert-Jan Schrijen and Toine Staring and Marten van Dijk},
      title = {Visual Crypto Displays Enabling Secure Communications},
      howpublished = {Cryptology ePrint Archive, Paper 2003/118},
      year = {2003},
      note = {\url{}},
      url = {}
Note: In order to protect the privacy of readers, does not use cookies or embedded third party content.