Download Advances in Cryptology — CRYPTO '97: 17th Annual by Mikael Goldmann, Mats NÄslund (auth.), Burton S. Kaliski Jr. PDF

By Mikael Goldmann, Mats NÄslund (auth.), Burton S. Kaliski Jr. (eds.)

This publication constitutes the refereed court cases of the seventeenth Annual overseas Cryptology convention, CRYPTO'97, held in Santa Barbara, California, united states, in August 1997 less than the sponsorship of the foreign organization for Cryptologic study (IACR).
The quantity provides 35 revised complete papers chosen from a hundred and sixty submissions obtained. additionally integrated are invited shows. The papers are equipped in sections on complexity idea, cryptographic primitives, lattice-based cryptography, electronic signatures, cryptanalysis of public-key cryptosystems, info conception, elliptic curve implementation, number-theoretic structures, disbursed cryptography, hash features, cryptanalysis of secret-key cryptosystems.

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The 2000s—In recent years, we have had many advancements in quantum Shannon theory (technically, some of the above contributions were in the 2000s, but we did not want to break the continuity of the history of the quantum capacity theorem). , 2002; Holevo, 2002b). This theorem assumes that Alice and Bob share unlimited entanglement and they exploit the entanglement and the noisy quantum channel to send classical information. A few fantastic results have arisen in recent years. , 2007). This protocol gives the minimum rate at which Alice and Bob consume noiseless qubit channels in order for Alice to send her share of a quantum state to Bob.

This measure reveals a problem with the above scheme—the scheme does not take advantage of the skewed nature of the distribution of the information source because each codeword has the same length. 1 Then the expected length of a codeword with such a scheme should be shorter than that in the former scheme. The following coding scheme gives an improvement in the expected length of a codeword: a → 0, b → 110, c → 10, d → 111. 6) Such coding schemes are common. Samuel F. B. Morse employed this idea in his popular Morse code.

Another measurement to perform is a measurement in the x direction. If the actual state prepared is |↑z , then the quantum theory predicts that the state becomes |↑x or |↓x with equal probability. Similarly, if the actual state prepared is |↓z , then the quantum theory predicts that the state again becomes |↑x or |↓x with equal probability. Calculating probabilities, the resulting state is |↑x with probability 1/2 and |↓x with probability 1/2. So the Shannon bit content of learning the result is again one bit, but we arrived at this conclusion in a much different fashion from the scenario in which we measured in the z direction.

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