552 research outputs found
Systematization of a 256-bit lightweight block cipher Marvin
In a world heavily loaded by information, there is a great need for keeping
specific information secure from adversaries. The rapid growth in the research
field of lightweight cryptography can be seen from the list of the number of
lightweight stream as well as block ciphers that has been proposed in the
recent years. This paper focuses only on the subject of lightweight block
ciphers. In this paper, we have proposed a new 256 bit lightweight block cipher
named as Marvin, that belongs to the family of Extended LS designs.Comment: 12 pages,6 figure
Extended Generalized Feistel Networks using Matrix Representation
International audienceWhile Generalized Feistel Networks have been widely studied in the literature as a building block of a block cipher, we propose in this paper a unified vision to easily represent them through a matrix representation. We then propose a new class of such schemes called Extended Generalized Feistel Networks well suited for cryptographic applications. We instantiate those proposals into two particular constructions and we finally analyze their security
Formulations of moist thermodynamics for atmospheric modelling
Internal energy, enthalpy and entropy are the key quantities to study
thermodynamic properties of the moist atmosphere, because they correspond to
the First (internal energy and enthalpy) and Second (entropy) Laws of
thermodynamics. The aim of this chapter is to search for analytical formulas
for the specific values of enthalpy and entropy and for the moist-air mixture
composing the atmosphere.
The Third Law of thermodynamics leads to the definition of absolute reference
values for thermal enthalpies and entropies of all atmospheric species. It is
shown in this Chapter 22 that it is possible to define and compute a general
moist-air entropy potential temperature, which is really an equivalent of the
moist-air specific entropy in all circumstances (saturated, or not saturated).
Similarly, it is shown that it is possible to define and compute the moist-air
specific enthalpy, which is different from the thermal part of what is called
Moist-Static-Energy in atmospheric studies.Comment: 44 pages, 8 figures,
URL:http://www.worldscientific.com/doi/abs/10.1142/9781783266913_002
The related-key analysis of feistel constructions
Lecture Notes in Computer Science, Volume 8540, 2015.It is well known that the classical three- and four-round Feistel constructions are provably secure under chosen-plaintext and chosen-ciphertext attacks, respectively. However, irrespective of the
number of rounds, no Feistel construction can resist related-key attacks where the keys can be offset by a constant. In this paper we show that, under suitable reuse of round keys, security under related-key attacks can be provably attained. Our modification is substantially simpler and more efficient than alternatives obtained using generic transforms, namely the PRG transform of Bellare and Cash (CRYPTO 2010) and its random-oracle analogue outlined by Lucks (FSE 2004). Additionally we formalize Luck’s transform and show that it does not always work if related keys are derived in an oracle-dependent way, and then prove it sound under appropriate restrictions
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