Marten van Dijk
Consultant, Inventor, Researcher, Applied Mathematician, & Computer Scientist
Visual Crypto Displays:
The use of computers in public places is getting increasingly common in everyday life. In using one of
these computers, a user is trusting it to correctly carry out her orders. For many transactions,
particularly banking operations, blind trust in a public terminal will not satisfy most users. Therefore
we need to provide the user with authenticated communication between herself and a remote trusted
computer, via the untrusted computer. In [1] this authentication problem is reduced to a simpler problem
and solutions are explored in which the user carries a trusted camera-based device with her. Display-based
solutions are presented in [2], leading to so-called visual crypto displays [3,4].
[1] D. Clarke, B. Gassend, T. Kotwal, M. Burnside, M. van Dijk, S. Devadas, and R. Rivest, The untrusted
computer problem and camera-based authentication, Proceedings of Pervasive 2002, 114-124, 2002.
[2] P. Tuyls, T. Kevenaar, G.J. Schrijen, A.A.M. Staring, and M. van Dijk, Visual crypto displays enabling
secure communications, Proceedings of the First International Conference on Security in Pervasive
Computing, LNCS 2802, 271-284, 2003.
[3] A.A.M. Staring, M.E. van Dijk, and P.T. Tuyls, Secure data input dialogue using visual cryptography,
US 2005/0044395, 2005.
[4] P.T. Tuyls and M.E. van Dijk, Key synchronization in a visual cryptographic systems,
US 2006/0210080, 2006.
© 2009 Marten van Dijk .
All rights reserved.