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- Hoi-Kwong Lo, Hoi Fung Chau
- 1996

There had been well known claims of unconditionally secure quantum protocols for bit commitment. However, we, and independently Mayers, showed that all proposed quantum bit commitment schemes are, in… (More)

- Hoi-Kwong Lo, Hoi Fung Chau
- ArXiv
- 1996

Work on quantum cryptography was started by S. J. Wiesner in a paper written in about 1970, but remained unpublished until 1983 [1]. Recently, there have been lots of renewed activities in the… (More)

- Hoi Fung Chau
- IEEE Transactions on Information Theory
- 2005

This paper presents a prepare-and-measure scheme using N-dimensional quantum particles as information carriers where N is a prime power. One of the key ingredients used to resist eavesdropping in… (More)

- Hoi-Kwong Lo, Hoi Fung Chau, M. Ardehali
- Journal of Cryptology
- 2004

We devise a simple modification that essentially doubles the efficiency of the BB84 quantum key distribution scheme proposed by Bennett and Brassard.We also prove the security of our modified scheme… (More)

- Hoi-Kwong Lo, Hoi Fung Chau
- 1996

There had been well known claims of “provably unbreakable” quantum protocols for bit commitment and coin tossing. However, we, and independently Mayers, showed that all proposed quantum bit… (More)

- Hoi Fung Chau
- 2006

A quantum string seal encodes the value of a (bit) string as a quantum state in such a way that everyone can extract a non-negligible amount of available information on the string by a suitable… (More)

- Hoi Fung Chau
- 2004

In search of a quantum key distribution scheme that could stand up for more drastic eavesdropping attack, I discover a prepare-and-measure scheme using N -dimensional quantum particles as information… (More)

- Hoi-Kwong Lo, Hoi Fung Chau, H-Gun labs, Bristol Stoke Gifford
- 1998

Quantum cryptography has long been claimed to be useful for achieving many tasks that are impossible from the perspective of conventional cryptography. Arguably, the most important problem in quantum… (More)

- Hoi Fung Chau, Hoi-Kwong Lo
- Cryptologia
- 1997

One-way functions are used in modern crypto-systems as doortraps because their inverse functions are supposed to be difficult to compute. Nonetheless with the discovery of reversible computation, it… (More)

- Hoi-Kwong Lo, Hoi Fung Chau
- 2007

Work on quantum cryptography was started by S. J. Wiesner in a paper written in about 1970, but remained unpublished until 1983 [1]. Recently, there have been lots of renewed activities in the… (More)