Truncated Diierentials of Idea
نویسنده
چکیده
In 1991 Lai, Massey and Murphy introduced the IPES (Improved Proposed Encryption Standard), later renamed IDEA (International Data Encryption Algorithm). In this paper we analyse versions of IDEA with a reduced number of rounds. We consider diierential attacks using truncated diierentials, which can be used to cryptanalyse, at least in theory, up to 3.5 rounds of IDEA. The attack on 3.5 rounds of IDEA contains a novel method to determine the secret key.
منابع مشابه
Truncated and Higher Order Differentials
In 6] higher order derivatives of discrete functions were considered and the concept of higher order diierentials was introduced. We introduce the concept of truncated diierentials and present attacks on ciphers presumably secure against diierential attacks, but vulnerable to attacks using higher order and truncated diierentials. Also we give a differential attack using truncated diierentials o...
متن کاملMiss in the Middle Attacks on IDEA ,
In a recent paper we developed a new cryptanalytic technique based on impossible diierentials, and used it to attack the Skip-jack encryption algorithm reduced from 32 to 31 rounds. In this paper we describe the application of this technique to the block ciphers IDEA, Khufu and Khafre. In the case of IDEA, the new attacks have smaller complexities and cover more rounds than the best currently k...
متن کاملCryptanalysis of Skipjack Reduced to 31 Rounds Using Impossible Diierentials
In this paper we present a new cryptanalytic technique, based on impossible diierentials, and use it to show that Skipjack reduced from 32 to 31 rounds can be broken by an attack which is faster than exhaustive search.
متن کاملThe Interpolation Attack on Block Ciphers
In this paper we introduce a new method of attacks on block ciphers, the interpolation attack. This new method is useful for attacking ciphers using simple algebraic functions (in particular quadratic functions) as S-boxes. Also, ciphers of low non-linear order are vulnerable to attacks based on higher order diierentials. Recently, Knudsen and Nyberg presented a 6-round prototype cipher which i...
متن کاملThe Buckling of Non-Homogeneous Truncated Conical Shells under a Lateral Pressure and Resting on a Winkler Foundation
In this paper, the buckling of non-homogeneous isotropic truncated conical shells under uniform lateral pressure and resting on a Winkler foundation is investigated. The basic relations and governing equations have been obtained for non-homogeneous truncated conical shells. The critical uniform lateral pressures of non-homogeneous isotropic truncated conical shells with or without a Winkler fou...
متن کامل