The hydraulic resistance paradox in rapid narrow pipe waterflow
نویسندگان
چکیده
منابع مشابه
Generic Collision Attacks on Narrow-pipe Hash Functions Faster than Birthday Paradox, Applicable to MDx, SHA-1, SHA-2, and SHA-3 Narrow-pipe Candidates
In this note we show a consequence of the recent observation that narrow-pipe hash designs manifest an abberation from ideal random functions for finding collisions for those functions with complexities much lower than the so called generic birthday paradox lower bound. The problem is generic for narrow-pipe designs including classic Merkle-Damg̊ard designs but also recent narrow-pipe SHA-3 cand...
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In this article, we give an approach to the problem of entropy and codomain reducing in a normal iterative hash function. The problem relies on the case of effective domain reducing which causes the empty set of a approximative probability e−1 in a iteration. We will keep, hold or recover the entropies by a way of Active Domain Expansion(ADE). ADE replaces the input message block by ∑ Mi in a n...
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In the last 7-8 months me and Klima have discovered several deficiencies of narrow-pipe cryptographic hash designs. It all started with a note to the hash-forum list that narrow-pipe hash functions are giving outputs that are pretty different than the output that we would expect from a random oracle that is mapping messages of arbitrary length to hash values of n-bits. Then together with Klima ...
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Recently several reports of Cryptology ePrint Archive showed the discovering that for a normal iterative hash function the entropy and codomain would reduce greatly,then some conclusions were given: Narrow-pipe hash functions couldn’t resist this reducing (But wide-pipe hash functions could.),and generic collision attacks on narrow-pipe hash functions would be faster than birthday paradox.The d...
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Draft tube of Francis type hydraulic turbine usually consists of: cone, elbow and diffuser. On the contrary, in some power stations an extra pipe should be added to the draft tube at the bottom of cone because of installation limitation. In this paper, this special case has been numerically studied. To this end CFD analysis was applied to simulate all parts of hydraulic turbine. A homogeneous m...
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ژورنال
عنوان ژورنال: Scientific Reports
سال: 2020
ISSN: 2045-2322
DOI: 10.1038/s41598-020-78109-4