QUANTUM BIT STRING SEALING
نویسندگان
چکیده
منابع مشابه
Quantum bit string commitment.
A bit string commitment protocol securely commits N classical bits so that the recipient can extract only M<N bits of information about the string. Classical reasoning suggests that bit string commitment implies bit commitment and hence, given the Mayers-Lo-Chau theorem, that nonrelativistic quantum bit string commitment is impossible. Not so: there exist nonrelativistic quantum bit string comm...
متن کاملAnalysis of one quantum bit string commitment
A. Kent proposed a quantum bit string commitment protocol in 2003. Not using the standard two conjugate states |0〉, |1〉, |+〉 and |−〉, the protocol uses ψ0 = |0〉 and ψ1 = sin θ|0〉 + cos θ|1〉, where θ 6= 0. In this paper, we show that the protocol can not guarantee security to the receiver. (1 − sin2 θ 2 )n bits are definitely exposed to the receiver, where n is the length of the committed string.
متن کاملProvably secure experimental quantum bit-string generation.
Coin tossing is a cryptographic task in which two parties who do not trust each other aim to generate a common random bit. Using classical communication this is impossible, but nontrivial coin tossing is possible using quantum communication. Here we consider the case when the parties do not want to toss a single coin, but many. This is called bit-string generation. We report the experimental ge...
متن کاملAn Information-Theoretic Security Analysis of Quantum String Sealing
A quantum sealing protocol is a quantum cryptographic protocol that can detect unsealing of a message. It is known that quantum bit sealing is insecure. However, this does not imply that quantum string sealing is also insecure. So the possibility of quantum string sealing has been studied. In this paper, we propose a quantum sealing protocol and give an information theoretic analysis. We also s...
متن کاملOn Inhomogeneity of a String Bit Model for Quantum Gravity
We study quantum gravitational effect on a two-dimensional open universe with one particle by means of a string bit model. We find that matter is necessarily homogeneously distributed if the influence of the particle on the size of the universe is optimized.
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ژورنال
عنوان ژورنال: International Journal of Quantum Information
سال: 2006
ISSN: 0219-7499,1793-6918
DOI: 10.1142/s0219749906002079