Meet-in-the-Middle Attacks on Classes of Contracting and Expanding Feistel Constructions
نویسندگان
چکیده
منابع مشابه
Meet-in-the-Middle Attacks on Classes of Contracting and Expanding Feistel Constructions
We show generic attacks on unbalanced Feistel ciphers based on the meet-in-the-middle technique. We analyze two general classes of unbalanced Feistel structures, namely contracting Feistels and expanding Feistels. In both of the cases, we consider the practical scenario where the round functions are keyless and known to the adversary. In the case of contracting Feistels with 4 branches, we show...
متن کاملMeet-in-the-Middle Attacks on Generic Feistel Constructions
We show key recovery attacks on generic balanced Feistel ciphers. The analysis is based on the meet-in-the-middle technique and exploits truncated differentials that are present in the ciphers due to the Feistel construction. Depending on the type of round function, we differentiate and show attacks on two types of Feistels. For the first type, which is the most general Feistel, we show a 5-rou...
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Improved meet-in-the-middle cryptanalysis with efficient tabulation technique has been shown to be a very powerful form of cryptanalysis against SPN block ciphers. However, few literatures show the effectiveness of this cryptanalysis against Balanced-Feistel-Networks (BFN) and Generalized-Feistel-Networks (GFN) ciphers due to the stagger of affected trail and special truncated differential trai...
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In the paper, we study the security of 3-line generalized Feistel network, which is a considerate choice for some special needs, such as designing a 96-bit cipher based on a 32-bit round function. We show key recovery attacks on 3line generic balanced Feistel-2 and Feistel-3 based on the meet-in-the-middle technique in the chosen ciphertext scenario. In our attacks, we consider the key size is ...
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چکیده ارتباط در کلاس به عوامل زیادی از جمله معلمان، دانش آموزان، برنامه های درسی و از همه مهم تر، مواد آموزشی وابسته است. در تدریس ارتباطی زبان که تاکید زیادی بر توانش ارتباطی دارد، کتاب درسی به عنوان عامل موثر بر پویایی کلاس محسوب میگردد که درس ها را از طریق فراهم آوردن متن ارتباط کلاسی و هم چنین نوع تمرین زبانی که دانش آموزان در طول فعالیت های کلاسی به آن مشغول اند، کنترل می کند. این حقیقت ک...
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ژورنال
عنوان ژورنال: IACR Transactions on Symmetric Cryptology
سال: 2017
ISSN: 2519-173X
DOI: 10.46586/tosc.v2016.i2.307-337