Tight Security Analysis of 3-Round Key-Alternating Cipher with a Single Permutation

Author(s):  
Yusai Wu ◽  
Liqing Yu ◽  
Zhenfu Cao ◽  
Xiaolei Dong
Author(s):  
Avijit Dutta ◽  
Ashwin Jha ◽  
Mridul Nandi

The security of a probabilistic Message Authentication Code (MAC) usually depends on the uniqueness of the random salt which restricts the security to birthday bound of the salt size due to the collision on random salts (e.g XMACR). To overcome the birthday bound limit, the natural approach to use (a) either a larger random salt (e.g MACRX3 uses 3n bits of random salt where n is the input and output size of the underlying non-compressing pseudorandom function or PRF) or (b) a PRF with increased domain size (e.g RWMAC or Randomized WMAC). Enhanced Hashthen- Mask (EHtM), proposed by Minematsu in FSE 2010, is the first probabilistic MAC scheme that provides beyond birthday bound security without increasing the randomness of the salt and the domain size of the non-compressing PRF. The author proved the security of EHtM as long as the number of MAC query is smaller than 22n/3 where n is the input size of the underlying non-compressing PRF. In this paper, we provide the exact security bound of EHtM and prove that this construction offers security up to 23n/4 MAC queries. The exactness is shown by demonstrating a matching attack.


Author(s):  
Masahito Hayashi ◽  
Toyohiro Tsurumaru

Abstract The paper (2012 New J. Phys.14 093014) contains an error at the definition of $g_t(x)$ in Section 5.3 while $g_t(x)$ is used for the second order asymptotic expansion for the sacrifice bit. This corrigendum corrects this error and shows its derivation.


Author(s):  
Yu.M. Sklyarova ◽  
I.Yu. Sklyarov ◽  
E.N. Lapina

2020 ◽  
Vol 10 (5) ◽  
pp. 43-49
Author(s):  
MARINA MARKHGEYM ◽  
◽  
ANNA BEZUGLAYA

The article presents the author’s analysis of constitutional texts, regulations and analytical materials of the countries of the Commonwealth of Independent States in order to consolidate in them the consolidated powers of the chambers of parliaments associated with the implementation of food security. Analysis of legal acts of the studied group of states showed that the sphere of food security (as part of the agrarian and food sphere/function) is one of the eventual spheres of interaction between the chambers of parliament. In the course of the study, two approaches of states to the formalization of provisions related to food security in constitutional texts were identified. The first approach is to consolidate norms that indirectly affect the field of food security (Belarus, Kazakhstan, Russia); the second - in the absence of such provisions (Tajikistan and Uzbekistan). It has been established that the interaction of the chambers of parliaments in the field of food security is implemented through the adoption of laws, as well as through various parliamentary events (parliamentary hearings, round tables, seminars, meetings, etc.). It is concluded that the available options for interaction between the chambers of parliaments of states in the field of food security reflect their independent approaches, which are developed on the basis of legal doctrine and practice.


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